2 stmicroelectronics led solutions
TRANSCRIPT
ST Solutions for LED Lighting
Jiří Smutka
Industrial & Multi-Market Competence Center
Applications Lab Prague, Czech Republic
Mai 2011
2
Presentation Outlook
ST LED Driver Product Range - overview
1. Energy-Efficient Solutions for LED Lighting
• Off-Line LED Drivers
• DC-DC Converters based Solutions
2. ST Solutions for Video Display / Matrix drivers
3. ST Solutions for Communication in Lighting
4
Presentation Outlook
ST LED Driver Product Range - overview
1. Energy-Efficient Solutions for LED Lighting
• Off-Line LED Drivers
• DC-DC Converters based Solutions
2. ST Solutions for Video Display / Matrix drivers
3. ST Solutions for Communication in Lighting
High Brightness LED evolution
Key Factors for AC/DC LED Drivers
Power Factor Lighting Power Supplies > 25W must have full
PFC.
Also <25W PFC needed to solve the problems
related to harmonic distortion in multi power
systems. ENERGY STAR Program Requirements for Solid State
Lighting Luminaries, Version 1.1: PF > 0.7 and > 0.9 respectively for Residential and Commercial.
Reliability For high lifetime and MTBF (key advantage of
LEDs), it is strongly recommended NOT using
electrolytic capacitors, especially input ones (high
voltage stress)
Retrofit lamp & bulb replacement 3-20W output power range solutions
Space constrains (lamp housing)
Compatibility with existing wall dimmers
6
Driving LEDs using AC-DC Solutions
3 to 10 W applications10 to 75W
applications
75W and up applications
(street lighting)
MONOLITHIC
HVLED805, VIPerPlus)
DISCRETE
L6562A + MOSFETCC/CV
TSMxx,SEAxx
HIGH PF DISCRETE
L656x +
MOSFET+RECTIFIER
CC/CV
TSMxx, SEAxx
HIGH PF + LLC
L656xA/T + L6599A/T
+ MOSFET +
SYNC/RECTIFIER
Key Benefits:
Extended temperature range
Innovative zero voltage
switching & resonant
topology:
efficiency > 92%
Aggressive form factors
Key Benefits:
Control and power section
separated
Post-regulation with dimming
No limitation to the number
of LEDs within a string
Cost-effective solution
Key Benefits:
Integrated
Robust
Miniaturized form factors
7
8
Driving LEDs using AC-DC Solutions
Isolated Non Isolated
FlybackCC/CV
FlybackCC/CV
BuckBuck-Boost
CC/CV
HPF
Flyback
FlybackCC/CV
PFC
HV
BuckCC/CV
BuckCC/CV
BuckCC/CV
BuckCC/CV
Resonant
HPFBuck-Boost
CC/CV
PFC
PFC
3W
150W
LED 3 – 10W = monolithic solution
HVLED805
Low components
Isolated
Primary side regulation CC/CV
Viper + family
General auxiliary supply use
Isolated or non isolated solution
HPF flyback as option
9
FlybackCC/CV
FlybackCC/CV
BuckBuck-Boost
CC/CV
HPF
Flyback
HVLED805
10
N.A.
N.A. CDC
SOURCE DRAIN
SOURCE
GND
IREF
ZCD/FB
COMP
Vcc
DRAIN
DRAIN
DRAIN
N.A.
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
N.C.
N.A.
N.A.
SOURCE DRAIN
SOURCE
GND
IREF
ZCD/FB
COMP
Vcc
DRAIN
DRAIN
DRAIN
DRAIN
DRAIN
N.A.
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
N.C.
SO16N
• CC/CV regulation with no
optocoupler•
• 800V, avalanche rugged internal
power MOSFET
• Internal HV start-up circuit
• Quasi-resonant ZVS operation
• Valley skipping at medium-light
load , burst mode operation at no-
load for under 60 mW
consumption
• Automatic self-supply
• Input voltage feedforward for
mains-independent CC regulation
• Low quiescent current (<1mA)
• SO16 package
PWMCONTROLLER
CC-CVREGULATOR
Vout
GND
Vin
• Only one IC
• No secondary
Rsense dissipation
11
Improved BOM, Form Factor & Efficiency
Standard Isolated
Solution
Constant Current
Controller
Sense resistor in
series with LEDs
Opto-coupler for
galvanic isolation
Auxiliary winding :
- Vcc for HVLED805
- Constant Current ctrl
LED current
set by resistor
Primary Side Regulation
Solution with HVLED805
• 2 Ics + 1 Opto
• Rsense*I² dissipation
12
Typical load regulation cv/cc
0 200 400 600 800 1000 1200
0
1
2
3
4
5
6
Ou
tpu
t V
oltag
e [V
]
Output Current [mA]
HV Startup is
ON
High current accuracy:
+/-5%
High voltage accuracy
+/-2.5%
Current Regulation Principle
Steady-state
relationships valid in
DCM only:Rs
RI
2
nI REFout
n
I
Rs
VI
SpkCPpk
S
FWSpkout
T
TI
2
1I
Demag
.
S
RQ
+
-
AUXILIARY
WINDING
TFW
Vin
Iout
Constant
current
Ic
Rs
V
c
Ip
Is
R
IREF
REFCS
FWC
T
T
R
VI0I -
IREF
-
Vc
R
t
t
t
IPpk
TFW
I
c
Ts
ISpk
IREF
Note: Iout not dependent
on either Vin, Vout or
Tsw
VC
o Input voltage range (VIN): 185 - 265 VAC
o Main frequency (fL): 50 - 60 Hz
o Maximum (rated) output power: 4.2 W
o Output: IOUT = 350 mA ± 5%
o Over voltage = 12 V max
o Current ripple < 10% IOUT
o Minimum switching frequency in
o normal mode: 70 kHz
o Target average efficiency (from 1 to 3 LEDs) > 70 %
o Maximum input power in no-load < 100 mW
EVALHVLED805 - 5 W Applications: HVLED805
Primary Side Controlled Flyback Topology
14
10R8
C12.2uF400V
1nFC3
2.5V
COMP SOURCE
DRAINVDD
+
-
CURRENTCONTROL
IREF GND
FB/ZCD
U1
ALTAIR05T
120KR2
STTH1L06AD1
C42.2uF
5.6KR4
C51nF
BRMB6S-RC
T1CORE E13
10kR6
L1
470uH
C22.2uF400V
33KR3
R1
221W
C74.7nF
C6470nF
STPS1H100A
D3
D2
LL4148
C8100uF
Low ESR
GND
12V - 0.35A
AC IN
AC IN
10
R5
C9100uF
Low ESR
3.3R7
N.C.R9
2.2nF
C10
HVLED805
EVALHVLED805 - 5 W Applications: HVLED805
Primary Side Controlled Flyback Topology
15
Performance
16
VIPer37
VIPer25
VIPer17 VIPer27
VIPer35VIPer15VIPer05
VIPer07
VIPer28 VIPer38
VIPer16 VIPer26VIPer06
DIP7
SO16N
DIP7
SO16N
DIP7
SSO10SDIP10
6 W 12 W4 W 15 W
24 7 30 4.5
Viper + Portfolio and Roadmap
SuperMESH
Technology 800V
avalanche rugged
Power MOSFET
Controller
17
Brown out
Over Load Delay
PWM operations with
settable IDLIM
Over Voltage
Over Temperature
shut down
No auxiliary
Quasi ResonantFixed Frequency
with Jittering
Internal OA - simple
Non Isolated loop
2° OCP
Feedback
disconnection
Extra Power Timer
Burst Mode
Soft start
VIPer x7 VIPer x8
Brown out
VIPer x5 VIPer x6Basic features
Auto restart
Auto restart
(fixed time)
Main features
800V
Avalanche Rugged
Fixed Frequency
with Jittering
Peak current setting
18
Using of current Lim feature for HPF
Max peak current is programmed by external Resistor – Rlim
This pin can be used to modulate peak current by input sin
voltage => allows to achieve High Power Factor
3.5W and 7W high PF Off-line LEDs driver schematic
19
ALTERNATIVES
- No PF required removal of component , then input Elcap necessary and lower output
capacitance
- No isolation required optocoupler removal and Vipx6 family usage (op-amp
available)
3 to 10 W Applications: VIPerPlus
High Voltage Converters in Flyback Topology
Power Factor Correction ( > 0.9 ) 3.5W ( 350mA ) with VIPer17 and 7W (700mA) with VIPer27
90 - 265Vrms Input voltage range
Open / Short circuit protection
No High voltage electrolytic capacitors
Optional low voltage electrolytic capacitor
>80 % Efficiency
20
EVLVIP27-7WLED
AN3212
7W high PF Off-line LEDs driver
LEDs current ( 700mA no e_caps )
CH4(green) = Iout,
CH3(red) = Vout,
CH1(brown) = Vdrain
Vac = 115V Vac = 230V
PF = 99% PF = 96%
21
7W high PF Off-line LEDs driver
LEDs current ( 700mA with 1000uF )
CH4(green) = Iout,
CH3(red) = Vout,
CH1(brown) = Vdrain
Vac = 115V Vac = 230V
PF = 99% PF = 97%
22
3 to 10 W Applications: VIPerPlus
High Voltage Converters in Flyback or Buck Topology
Key features Main benefits
• Single package approach:
• integrated
• robust
• sophisticated
• Miniaturized form factors
• Easy design
• High power factor > 0.7 • Compliant to energy saving
regulations
• No high voltage el-cap
usage
• High reliability (extended
MTBF)
VIPerPlus high voltage converters in
flyback topology, associated to TSM1052,
constant voltage, constant current
controller ( or new CC/CV controller
SEA05). Buck topology for not isolated
applications with low cost current
control circuit
Evaluation board Application note Description
STEVAL-ILL017V1 AN2811Not Isolated Flyback constant
current source with VIPer17HN
STEVAL-ILL026V1 AN29613W not-isolated off-line LED
driver based on VIPer22AS
EVLVIP17-5WCHG AN2840Constant current output Viper17
flyback converter
23
LED Middle power (10W to 70W)
L6562,3,4 (PFC chip)
PFC converter
HPFF
Buck converter
24
BuckBuck-Boost
CC/CV
HPF
Flyback
FlybackCC/CV
PFC BuckCC/CV
25
C
C
M
L6561TM PFC
8pinOVP stat./dyn.
L6562IMPROVED
TM PFC
L6561 pin-to-pin
Improved THD
Extended supply range
Powerful gate driver
L6563/SADVANCED
TM PFC
TBO
FDBK disconnection
Brownout
Reduced consumption
PWM interface
Input volt. Feedforward
L4981A/BAVG CURRENT
MODE PFC
Input voltage Feed-forward
Load Feed-forward
Progr. Turn-On Threshold
OVP & Over-current Protection
L6562ATM PFC
L6562 enhanced
Lower CS threshold
New gate driver
Higher efficiency at
light load
L6563/HHigh voltage
start-up
T
M
L6564TM PFC
L6562A enhanced
Input volt. Feedforward
PWM interface
STM PFC Chips Roadmap
26
Features & Block Diagram L6562A
APPLICATIONS:
PFC PRE-REGULATORS FOR:
• ELECTRONIC BALLAST
• EC61000-3-2 COMPLIANT SMPS (FLAT-TV, DESKTOP PC,
MONITOR, GAMES)
• HI-END AC-DC ADAPTER/CHARGER
• Precise Internal Reference
(1% @25°C)
• 1.1V Current Sense threshold
• DIGITAL Leading-edge blanking on
Current Sense
• Disable function on FB input
• Ultra Low Start-up Current (<60µA)
• Low Quiescent Current (2.5mA typ.)
• ZCD input for TM
• Two-level OVP Protection
• THD optimizer circuit
• Extended supply voltage range
• -600 / +800mA totem pole gate driver
with pull-down and voltage clamp
• Package: DIP-8/SO-8
TRANSITION MODE PFC
CONTROLLER
VREF2
OVERVOLTAGE
DETECTION
VOLTAGE
REGULATOR
UVLO
INTERNAL
SUPPLY BUS
+
-
= 2.5V
-
+
+-
STARTER
+
-
ZERO CURRENT
DETECTOR1.4 V
0.7 V
VCC
8
1 2 3 4
ZCD
VCC
INV COMP MULT CS
GD7
5
GND6
25 V
Starter
stop
LEADING-EDGE
BLANKING
DIS
LOWER & UPPER
CLAMPS
DIS -
+0.45 V
0.2 V
DYN
OVPSTAT
OVP
MULTIPLIER AND
THD OPTIMIZER
R
SQ DRIVER
& CLAMP
ERROR
AMPLIFIER
PWM
COMPARATOR
1 V
VREF
27
L6563/SADVANCED
TM PFC
TBO
FDBK disconnection
Brownout
Reduced consumption
PWM interface
Input volt. Feedforward
L6562ATM PFC
L6563/HHigh voltage
start-up
L6564TM PFC
Input volt. Feedforward
PWM interface
STM PFC Chips Roadmap
=
=
=
+
L6563/SADVANCED
TM PFC + High Voltage Start up
L6562ATM PFC +
L6562ATTM PFC
Extended thermal range= L6562ATM PFC +
Application of L6562A family in LED
PFC
Transition mode PFC
up to 150W for WR
FOT up to 3kW
HPFF (High Power
Factor Flyback)
Simple isolated
solution up to 50W
Buck
Modified Buck
converter
28
Evaluation board Application note Description
EVL6562A-LED AN2983 Constant current inverted buck
LED driver using L6562A
EVL6562A-LED AN2928 Modified buck converter for LED
applications
STEVAL-ILL019V1 UM0926 32W High PF Flyback offline +
RGGB LED driver with LED
channel brightness regulation
EVL6562A-
35WFLB
AN2838 35 W wide-range high power
factor flyback converter
demonstration board using the
L6562A
STEVAL-ILL13V1 AN2928
UM0670
80W off-line LED driver with
dimming based on L6562A
STEVAL-ILL27V1/2 AN3111 18 W single-stage offline LED
driver based on L6562A
STEVAL-ILL034V1 AN3256 LED driver for an A19 lamp based
on the L6562A for USA market
PFC: transition mode (TM) control
Variable switching frequency, constant TON
Operation close to the boundary between
continous and discontinuous conduction mode,
@ZVS
Peak current mode control, simple, low-cost.
Suitable for lower power levels (< @150W
approximately)
29
IL IAC
ON
MOSFET
OFF
MULT
GND
L6561
L6562A
L6564
L6563x (*)GD
COMP
CS
RECTIFIED
MAINS
VCC
ZCD INV
(*) L6563: 14
pin IC with
advanced
logic
10 to 50 W Applications: Transition Mode PFC
in Isolated Flyback and inverted Buck Topology
HPF Flyback Section:
• Line voltage range: 90 to 265 VAC
•Power factor (load = 50 %): 0.9 minimum
• Minimum efficiency: 85 % at full load
inverted buck section:
• CC operation up to 600 kHz
• Fixed-Off-Time Peak-Current-Mode control
• No sub-harmonic oscillation
• No need for slope compensation
• High-efficiency (>90% with 6+ LEDs)
•Ripple current is constant also when input and output ( n. LED )voltage change
• Very deep dimming (<1% @250 Hz) due to IC immediate restart
• Up to 200 V LED driving capability
30
35W Isolated HPFF and inverted Buck Topology
Key features Main benefits
• High power factor fly-back
topology supported > 0.9
• Compliant to energy
saving regulations
• Control and power section
separated
• Suitable for high power size
• Design flexibility
• Post-regulation with
dimming solution
• Dimmable solutions
• High output voltage • No limitation to the number
of LEDs within a string
• Based on cheap controller
and MOSFETs
• Cost-effective solution
L6562A, transition mode power factor corrector in
flyback topology.
•associated to TSM1052, constant voltage,
constant current controller (or new CC/CV
controller SEA 01 coming soon) for single LED
columns
•Associated to inverted buck converter based
on L6562A or DC/DC converter for multiple
LED columns
Ideal for:
Single /Multiple LED columns
31
STEVAL-ILL019V1 UM0926
L6562A Isolated High PF AC/DC LEDs Driver 35W:
EVL6562A-35WFLB
SuperMESH3 MOSFET
32
STEP-DOWN based on low voltage controller
Inverted (modified) Buck Topology
33
nVLED
VIN
INDUCTANCE
• charges on VIN – nVLED
• discharges on nVLED
M
D
LDIODE spec
• VRRM > VIN
• IAVG = I LED x (1 – D)
MOS spec
• VDss > VIN
• IRMS2 = I LED
2 x D
M MD
I LED
STEP-DOWN based on low voltage controller
Transition Mode PFC in Inverted Buck Topology
GND
GD
CS
ZCDCOMP
INV
VCC
MULT
L6562A
L6563A
VIN 48 VDC
PWR GND
VCC 15V
DIMMING 1 (PWM 250HZ VARIABLE DUTY )
C6
R7
R4
C2
R8
C5
D2
D1
R3
R2
R6
R5
R9
M1
L1
LED
D3
D4
C7
350 mA
34
M MD
I LED
FIX OFF time
ON time limited
by peak
current
By adding the connection marked in red, makes the output current ripple NOT DEPENDENT
on the how many LEDs are supplied.
It is possible to demonstrate that ILED = (VCS – K Vin)/Rs
Where :
VCS = Current Sense Threshold Voltage K = (TOFF Rs)/ 2 L1
Rs = R8 in the below schematics
L6562A DC-DC Inverted Buck Improvement
GNDGD
CSZCDCOMP
INV
VCC
MULT
L6562A
PWR GND
VCC 15V
10%
C6
R7
R4C2R8
C3
C5
D2
D1
R3
R2
R6
R5
R9
M1
L1
LED
D3
D4
C7
R
VIN 48 VDC
Being K = R4/ R+R4 and already
fixed K from the former equation,
it is possible to determine R4 and
calculate R
Compensation resistor size
35
EVL6562A-LED AN2983 + AN2928
Vin = 88V to
265V ac
Input Filter
PF controller
L6562A PF controller
L6562A
MODIFIED BUCK CONVERTERHIGH POWER FACTOR BOOST CONVERTER
400V 80W LOAD
HIGH POWER FACTOR BOOST
CONVERTER:
• Transition mode operation
• Wide input voltage range 88V to 265V ac
• Regulated output voltage 400V
MODIFIED BUCK CONVERTER:
• Continuous conduction mode operation
• Fix Off Time (FOT) network designed
• LED current setting 350mA, 700mA and 1A
STTH1L06
STP8NM50FPSTPSC806D
STF9NM50N
Microcontroller
ST7LITEU05
PWM GENERATOR
PWM GENERATOR:• PWM frequency 250Hz
• 0% to 100% DC variation
• Input voltage 3.3V to 35V
• Knob for regulation
80 W and up Applications (Street Lighting):
PFC Boost + inverted Buck Converter
36
STEVAL-ILL013V1
AN2928, UM0670
L6562A: HPF Buck-Boost & Inverse Buck
37
Key features Main benefits
• Buck-Boost topology• Simple
• Low Cost
• Transition Mode Operation• Lower Switching Losses
• Spread of EMI Spectrum
• High power factor > 0.8
• Compliant to energy saving
regulations. Suitable for
residential lighting
• Open Load Protection
• Short Circuit Protection• Robust
Evaluation board Application note Description
STEVAL-ILL027V1 AN311118 W single-stage
offline LED driver
STEVAL-ILL034V1 AN3256
LED driver for an
A19 lamp based
on the L6562A for
USA market
HPF Buck Boost
HPF Inverse Buck
STEVAL-ILL027V1
38
1
2
P2
R14100K
1
2
LED -
LED +
C8
470nF/~305V acL1 20mH
C10
470nF/~305V ac
3
2
4
1-
+
D1
INV1
GD7
COMP2
ZCD5
VC
C8
MU
LT
3G
ND
6
CS
4
U1 L6562AD
R12
100K
R16
100K
R10
20K
R7
130K
R8
100K
C5
2.2uF/50V
C6
NC
C7
1nF/50V
R312K
R15500K
R9500K
C9
150nF
~305V ac
D8
STTH1R06A
R412K
T1
Q1
STD11NM50N
R533R
D3NC
R6
2R7
R112R7
D7
STTH3R06A
C1
100uF/100V
STEVAL-ILL027V1
39
1
2
P2
R14100K
1
2
LED -
LED +
C8
470nF/~305V acL1 20mH
C10
470nF/~305V ac
3
2
4
1-
+
D1
INV1
GD7
COMP2
ZCD5
VC
C8
MU
LT
3G
ND
6
CS
4
U1 L6562AD
R12
100K
R16
100K
R10
20K
R7
130K
R8
100K
C5
2.2uF/50V
C6
NC
C7
1nF/50V
R312K
R15500K
R9500K
C9
150nF
~305V ac
D8
STTH1R06A
R412K
T1
Q1
STD11NM50N
R533R
D3NC
R6
2R7
R112R7
D7
STTH3R06A
C1
100uF/100V
LED High power (>70 – 80W) isolated
L6562,3,4 (PFC chip) + L6599A(T)
PFC converter
Resonant converter (isolation)
40
BuckCC/CV
ResonantPFC
MAIN FEATURES:
• Wide input mains range (85 to 305 Vac)
• Output voltage: 48V @ 2.7 A
• Efficiency: >90% @ 115Vac – Full load
• No-load consumption 0.3W @ 230Vac
• Long life, high MTBF (No EL-CAPS)
• Mains harmonics: according to EN61000-3-2,
JEITA-MITI
• EMI: meets EN50022 Class B
• Safety: meets EN60950
• MIXED PTH/SMT FOR LABOR COST
REDUCTION,
• 1 heat-sink only required (for input bridge)
• PCB double layer 90x170 mm
• Maximum height: 30 mm
Ideal for:
Multiple LED
columns
80 W and up Applications (Street Lighting):
Transition Mode PFC + Resonant Controller
Evaluation board Application
note
Description
EVL130W-SL-EU AN3105 48V-130W Led Street Lighting SMPS based
on L6562AT & L6599AT for European input
mains range
EVL130W-STRLIG AN3106 48V-130W Led Street Lighting SMPS based
on L6562AT & L6599AT for wide input
mains range
STEVAL-ISC002V1 90W PFC + Resonant CV SMPS
41
fm2
2 kC
0.1 1 100
0.5
1
1.5
2
2.5
3
M x kC 0
M x kC 0.5 Qmax
M x kC 2 Qmax
M x kC Qmax
M x kC 101
B x kC
x
a
Q=0.38
Iout
Vin
VoutaM
Q=10
Q=0.19
Q=0.76
Q=0
(open output)
Inductive region
Current lagging (ZVS)
f f r1f f r2
1
1 k
k=5
Capacitve region
Current leading (ZCS)
ZVS-ZCS borderline
Resonance:
Load-independent point
All curve have slope = -1/ k
1
2
k
1 k×
fr11
2 Ls Cr
fr21
2 Ls Lp( ) Cr
3 reactive elements, 2 resonant
frequencies
fr1
fr2
Resonant Converter: LLC Circuit
42
Half-b
rid
ge
Drive
rVin
Cr
Vout
LLC tank circuit
Ls
Lp
Vout
Center-tapped output with full-wave
rectification
(low voltage and high current)
Single-ended output with bridge
rectification
(high voltage and low current)
Q1
Q2
Resonant Converter : LLC Circuit & Features
LLC features
Multi-resonant LLC tank circuit
High efficiency:>96% achievable
Variable frequency control
Fixed 50% duty cycle for Q1 & Q2
Dead-time between LG and HG to
allow MOSFET’s ZVS @ turn-on
fsw fr, sinusoidal waveforms: low
turn-off losses, low EMI
Equal voltage & current stress for
secondary rectifiers; ZCS, then no
recovery losses
No output choke; cost saving
Integrated magnetics: both L’s can be
realized with the transformer.
Preferably integrated into a single
magnetic structure
AC/DC Stage
SuperMESH3
MDmesh II
FDmesh II
43
L6599A: an IC to remember
50% Duty Cycle, variable frequency control of ZVS resonant Half Bridge (HB)
Up to 500KHz operating frequency
Superior stand-by performance Burst-mode operating at light load
Direct interface with PFC controller
High performance protections Two-level OCP: frequency-shift and latched shutdown
Latched disable input
Input for brownout protection or power ON/OFF sequencing
Non linear soft-start for monotonic output voltage rise
High accuracy oscillator
600V rail compatible high side gate driver with integrated bootstrap diode and high dV/dt immunity
300/800 mA high side and low side gate drivers with UVLO pull-down
Available in PDIP16 and SO16N packages
44
DIP16SO16N
Application
note
Description
AN2450 LLC resonant half-bridge converter design
guideline
AN2644 An introduction to LLC resonant half-
bridge converter
47
L6563, L6564
PWM is turned OFF in
case
of PFC's anomalous
operation
L6563 can be turned OFF
at light load for energy
saving
Vinac Voutdc
L6563/4
PWM
PFC PRE-REGULATOR DC-DC CONVERTER
OUT
PWM_LATCH
PWM_STOP
RUN
PFC_OK
PFC FAULT:Low input voltage RUN
Reduced consumption
PWM stopped ( NOT LATCHED)
PWM_STOP
Feedback disconnection PFC_OKReduced consuption
PWM stopped (LATCHED)
PWM_LATCHTransformer saturation CS
Interface with PWM/QR Controller
Digital Constant Current Controller
for multi-string LED driving e.g. Streetlight
Description & purpose: complete platform (HW/SW) for LED multi-string constant current control based on an innovative methodology (Patent Submitted)
Key Features: Input DC Bus Voltage:48V
LED String independent average current control
inverted Buck Topology
System Power: 4x30W max
Switching freq. 60kHz
LED current ripple <10%
Global dimming from 0% to 100% at 225Hz
Key Benefits: High Efficiency
Cost effective
Key Products: STM8S208RB STPS1L60, STN3NF06
Application: LED Streetlight
LED Driving
ADC-1
30W
PWM-1 4
8V
PW
M-2
AD
C-2
PW
M-3
AD
C-3
PW
M-4
AD
C-4
30W
30W
30W
48
49
Digital current control based on STM8 / STM32
ADC sampling @ Ton/2
Triangular Carrier (Center aligned pattern)
PWM
Average current
OC Register
Key Advantages:
• Inductor current reconstruction with fine resolution (<=3%)
• Cost effective, high performance with real average current control
• No passive components for filtering
Gate Signal
Vse
nse
Solution Architecture: 120W LED Street-light and high
power 4 channel LED
ADC-1
VIN
STM8S20xx
Microcontroller
®
PWM1
30
W
PWM-1
48V
30
W
30
W
30
WP
WM
-2
AD
C-2
PW
M-3
AD
C-3
PW
M-4
AD
C-4
50
Vin=48V VuC=5V
Four LED Outputs STM8S Trimmer for
dimming
Joystick for
control
setting
Reset
BOM List:
• STM8S208RB
• STN3NF06L
• STPS3L60
From Idea to Demoboard:
LED Current Controller STM8S-based
51
STEVAL-ILL031V1
AN3151
Multi String Current Control Method
Cyclical update of the PI controller output for the 4 channels
52
Off-line LED drivers: Evaluation boards
summary (1/2)
Solutions available and technical documentations
P/N Order Code Vin (VAC) Iout (mA) Vout (VDC) Comments AN
VIPER12A (*) STEVAL-ILL005V1 85 to 265350 & 700 &
10503.5 to 15
Flyback constant
current sourceAN1916
VIPER22A (*) STEVAL-ILL001V185 to 135 or
185 to 265350 3.5 to 28
Flyback
dimmableAN2042
VIPER17HN(*) STEVAL-ILL017V1 176 to 265 500 7 Vmax
Not Isolated
Flyback constant
current source
AN2811
VIPER22A STEVAL-ILL026V1 85 to 265 350 0 to 40Buck constant
current sourceAN2961
(*) plus TSM10x
53
Off-line LED drivers: Evaluation boards
summary (2/2)
Solutions available and technical documentations
P/N Order Code Vin (VAC) Iout Vout (VDC) Comments AN
L6562A STEVAL-ILL016V2 120Vac±20% 700mA 40Vmax
15W HP Flyback
constant current
source
AN2711
L6562A EVL6562A-35WFLB 90 to 265 700mA 48V
35W HP Flyback
constant current
source
AN2838
L6562A STEVAL-ILL013V1 85 to 265350mA, 700mA
or 1A400V
80W PFC Boost +
Modified buck
converter
AN2928
UM0670
L6562AT
L6599ATEVL130W-STRLIG 85 to 305 2.7A 48V
130W PFC Boost
+ LLC LED SMPSDRAFT
L6562A STEVAL-ILL027V1 120Vac±10% 350mA 54V
18W single stage
off-line LED
driver
DRAFT
L6562A STEVAL-ILL019V1 85 to 265 4x350mA 48V32W off-line
RGGB LED driverUM0926
L6562A EVL6562A-LED 48V (+/-20%) 350mA Up to VinDownstreem
Inverted Buck CCAN2928
54
55
Presentation Outlook
ST LED Driver Product Range - overview
1. Energy-Efficient Solutions for LED Lighting
• Off-Line LED Drivers
• DC-DC Converters based Solutions
2. ST Solutions for Video Display / Matrix drivers
3. ST Solutions for Communication in Lighting
Driving LEDs using DC-DC Switching Regulators
L598x
L692xL597x L6902
L7980/1
LED770x
L7985/6
Battery powered applications
• Single & multiple Li-Ion, Ni-MH
and alkaline battery systems
• Automotive battery range
DC BUS powered
applications
Up to 48 V
LED770x
L6920
A597x
PM6600
L692xL7987/8 up to
63 V in
development
Boost topology for
multi-rows applicationsBoost topology Buck Boost topologyBuck topology (Typical)
ST1S10 STCF07L6726A*
* PWM Controller
STLA02
LED770x: boost topology
Evaluation Board Application note Description
STEVAL-ILL020V1 AN2809 LED7706: 6-row / 30-mA LED driver
with boost converter for the
backlight of LCD panels
STEVAL-ILL021V1 AN2810 LED7707: 6-row 85 mA LED driver
with boost converter for LCD panel
backlighting
MAIN FEATURES:
• Vin = 4.5 to 36 V
• Maximum RMS switch
current: 2.5A
• Parallelable channels for
higher current (LED7707)
• LED current: up to 85mA/ch
(LED7707)
• Channel to channel current
mismatch: ±2%
• Up to 20kHz PWM dimming
(1%-100%, LED7706)
Ideal for:
Consumer: mid to large size LCD
TV, MNT
Automotive: navigation displays
and dash board
Industrial: lighting, displays,
emergency lighting
Slope Compensation
Key features Main benefits
• Up to 6/8 ROWs with 30 mA
max current capability (adj.)
• ROW disable option
• Great flexibility in the
application coverage of
all the mobile PC screen
size (8”-17”)
• Internal Power MOSFET • Save application cost
and real estate
• LED failure (open and short
circuit detection)
• Soft-start, Programmable OVP
protection, Thermal shutdown
• Full and flexible fault
management
• 500 ns minimum dimming time
(1% minimum dimming duty-
cycle at 20kHz)
• ±2 % current matching
between rows
• Superior brightness
uniformity, with tight
current matching
• Pulse-skip power saving mode
at light load
• Longer battery life and
new energy regulation
compliancy (VESA-NEBL)
• Ceramic output capacitor
supported
• Save BOM cost
• Housed in QFN4x4 24L
package
• Compactness
Compact, flexible and cost effective
solutions capable to drive up to 80 LEDs,
with PWM or SMBUS interface
Ideal for:
Notebook/ Netbook/ Nettop
PM660x: Monolithic LED Driver Family for Mobile
PC LCD Panel Backlighting
PM6600: Typical application circuit
Design-support material Description
Evaluation board
STEVAL-ISA056V1
6 rows - 30 mA LEDs driver with boost
converter for notebook pc LCD panels
backlight based on PM6600
Documentation,
application components
calculation ws
Available on request
Monolithic solution with BOOST and 6 embedded
rows drivers, capable to drive up to 60 LED.s
Main applications:
• Notebook/ Netbook/ Nettop
Ideal for:
Wide input voltage range (4.7V-28V)
Up to 10 white LEDs per row
High efficiency (>90%)
Current capability per row up to 30mA
, ±2 % current matching between
rows
PM6602: Typical application circuit
Design-support
material
Description
Evaluation board &
Application Note
Available on
request
Monolithic solution with BOOST and 8 embedded
rows drivers, capable to drive up to 80 LED.
PWM/SMBUS interface is adjustable.
Main applications:
• Notebook/Netbook/Nettop
Ideal for:
Wide input voltage range (3.3 V-28 V)
Up to 10 white LEDs per row
High efficiency (>90%)
Current capability per row up to 30mA , ±2 %
current matching between rows
SMBUS/PWM interface
STLA02
20mA Boost LED Driver for Backlight
Key features Main benefits
• Input Voltage Range 2.5V To
12V
• Suitable for portable
devices powered by a
single cell Li-Ion battery
• 2.3 Mhz Fixed Frequency • Small Inductor
•Less than 1µA Stand-by Current • Longer battery life
• PWM Input Brightness Control
with 300:1 Dimming Range
• Tight Dimming
capability
• Internal Soft Start • No Inrush Current)
• Ceramic output capacitor
supported
• Save BOM cost
• Package DFN 2x2 6L • Compactness
VIN
L
CINSTLA02
RFB
EN/PWM
VIN
LX
VOUT
FB
GNDILED
VIN
L
CINSTLA02
RFB
EN/PWM
VIN
LX
VOUT
FB
GNDILED
Ideal for:
Small LCD Display Backlight (7”),
Keyboard Backlight E.S. Available
Max # LED Vin=12V Vin=24V
ILED=350mA 10 17
ILED=500mA 6 10
Rough Estimation from calculus: VF=3.5V,
fsw=250kHz, L=47uH
Driving LEDs with L597x family: alternative
topologies: Positive Buck-Boost
L5973D
#LED limited by:
IOUT,MAX = 2A =>
LED Accuracy: +4.5% and -4.78% with VSENSE=525mV
DA is the actual duty cycles considering power losses
MAX,OUTAMAX,LED IDI 1
1
2
1
21R
R
R
V
R
R
R
VI
S
REF
S
FBLED
L7980/1: up to 28 V, 3 A monolithic step-down
Key features Main benefits
• More than 3A in small
QFN3x3-8L or in HSOP8
package
• Minimum external
component count
• Compactness
• P-channel power MOS • No bootstrap capacitor
required
• 100% duty cycle
• Save application cost
• Wide input voltage range
(4.5 V up to 28 V)
• Flexibility of the
application (5 V, 12 V
buses)
• Compatible with MR16
standard
• Adjustable switching
frequency (250 KHz, adj up
to 1 MHz)
• Synchronization
capability (180° out of
phase)
• Small output filter
• Small input cap
• Internal Soft-start • No inrush current
• Inhibit pin • Energy saving
• Suitable for MLCC output
filter
• Small & cheap Cout
Ideal for:
Driving up to 6 LEDs with Vin up to 28 V
General lighting/ MR16 halogen bulb
replacement
L7985/6 up to 38V
in development
Application IDEA for LED-MR16 retrofit lamps:
L7980 evaluation board
Functionalities High switching frequency to ensure
compactness
Significant efficiency improvement by
reducing the voltage reference to less than
200mV
Very low current ripple to improve LED
lifetime
High reliability thanks to convection cooling
L7980
0.6V
L7980
0.6V
L7980
0.18V0.42V
ST1CC40 – what is it ?
ST1CC40 , step down constant current LED driver in small outline package
Input Voltage range 3.5V – 18V
Output current 3A peak
Synchronous Rectification to increase efficiency
Fedback Voltage Vfb for current sensing very low value 100 mV – thus minimising losses on sensing resistor.LED current = V fb / R sense
PWM dimming achieved by toggling Inhibit / DIM pin with square wave of variable duty cycle
Fixed Switching Frequency
800 kHz
Extra Functions
Inhibit - Voltage on pin V > 1.2V device ON ; V <0.4V device OFF
Cycle by cycle over current protection
Thermal protection
Internal Soft start to reduce inrush current at start up
Package
VFQFPN8 4x4 ; SO8
65
Typical Application Circuit
Driving LEDs usign DC-DC converters:
Evaluation Boards Summary
Part Number Order Code Vin Ioutmax Comments AN
L5973D STEVAL-ILL007V112Vac
12V to 24V dc1A
High Intensity LED driver for
MR-16 format based on
L5973D
AN2559
L6920D STEVAL-IILL008V1 1V to 3V 350mACree LED Flashlight with
L6920DAN1941
L6902 STEVAL -ILL010V1 8V to 30V 350mAHigh Intensity LED Dimming
Driver based on L6902AN2129
STCS1A STEVAL-ILL014V1 4.5V to 40V up to 1.5AHigh Brightness Linear LED
Driver based on STC1A UM0422
LED7706 STEVAL-ILL020V1 4.5V to 32V20mA
per channel
LEDs Driver with Boost
Converter for LCD Panels
Backlight
AN2809
LED7707 STEVAL-ILL021V1 4.5V to 32V60mA
per channel
LEDs Driver with Boost
Converter for LCD Panels
Backlight
AN2810
L6726A STEVAL-ILL023V1 8V to 18V 1A / 1.5A / 2.8A
Buck synchronous LED Driver
for high current LED based on
L6726A + MOSfets
UM0677
STLD40D STEVAL-TLL001V1 3V to 5.5V up to 20mAWhite LED Controller in
Boost topologyAN2333
L6562A EVL6562A-LED 48V 350mAConstant current inverted Buck
LED driver AN2928
Buck Converters LED Driver Summary
Buck- Boost Converters LED Driver Summary
Boost Converters LED Driver Summary
eDesignStudio: what is it?
eDesign studio
is a SW platform that helps and speeds-up the design-in of
STMicroelectronics products for power conversion applications:
AC-DC conversion
DC-DC conversion
AC-DC LED driving*
DC-DC LED driving*
*coming soon on www.st.com
The new, easy power management design tool
Where to find it
1. Go to st.com support tools & resources (see below arrows) SW tools simulators
& CAE resources simulators
2. Click on SMPS eDesign Studio on the next page
3. Login on my.st.com (register yourself if not yet done)
The external version works
only on-line. Nothing
must/can be downloaded.
UPgrades are guaranteed.
It is also possible a direct
access by typing
www.st.com/edesignstudio
1
2
72
Presentation Outlook
ST LED Driver Product Range - overview
1. Energy-Efficient Solutions for LED Lighting
• Off-Line LED Drivers
• DC-DC Converters based Solutions
2. ST Solutions for Video Display / Matrix drivers
3. ST Solutions for Communication in Lighting
73
Overview on Power Logic Applications
Arcade Gaming & Gambling Machine
White Goods
Large Panel / Signs
Automotive Interior & Exterior
Traffic Panels /Matrix
Back-Lighting
Special Lighting
LED Illumination for gaming / gambling machine
Front Display Panels & LED Illumination for Washers, Ovens etc.
Full-color, Monochrome High-resolution Large Displays
Dashboards, Car Radios, signal lights, CHMSL and other lighting applications
Traffic Variable Message Signs (VMS), variable speed limit signs, parking guidance systems
LED Lighting applications from architectural to special illuminations (mood lighting)
LCD panels Backlighting
STP08C/D05, STP16Cxxx05
STP16Cxxx05
STP16CP/C05,
STP16Dxx/S05, STP24DP05,
STP1612PW05
STP08CP05,
STPIC6C/D595
STP08/16Dxxx05,
STP24DP05
STP04CM05
STP1612PW05
STP16PWL05
74
LED drivers Power Logic
Main Applications require manipulation of LED current and time to produce images:
ST provides a wide range of High-Innovative-Performance products for Design needs to drive LEDs. The STPxxyy05 is the excellent solution to extract maximum performances from LED application.
SPI interfaces, PWM, Current Gain
LEDs driving constant current (except STPIC6C/D595)
full output error detection, auto power shutdown
4,8,16,24 Channel drivers
1 to 400 mA driver current range per channel
Series STPxxyy05
Key Advantages:
Mono-Multi-Full-Colour LED display/signs
Traffic-Backlighting Display
Gaming Machine and White goods
Architectural Lighting
KEY Features:
High accuracy on current driving
Footprint Compatible for 8 and 16 channel
Extended temperature range -40 to 125C
Shift
Register
(serial to
parallel)
____
CLRSRCK
__
G
SERIA
L IN
RCK
PG
ND
SERIA
L OUT
Enable
and
Latch
Po
wer
DM
OS
O/P
s
Typical application
76
STP08/16xxy05 –
8/16 channels, 5-100mA LED drivers
OUT 0 OUT 1
OE/DM2
LE/DM1
16 bit shift register
Latch and Enable
Power
saving
detection
Open/Short Circuit Detector
Control
logic
Analog stage
SDI
CLK
SDO
OUT 15
Thermal
shutdown
R-EXT
77
STPxxyy05 summary
Part Number N ch ILED (mA)
ΔILED Error
detection
Auto
Power
Saving
Balanced
Turn
ON/OFF
Staggered
output
delayBetween bits Between ICs
STP04CM05 4 80 ÷ 400 ±1% (80÷400mA) ±6%
STP08CP05 8 5 ÷ 100 ±1.5% (20÷100mA) ±3%
STP08DP05 8 5 ÷ 100 ±1.5% (20÷100mA) ±5%
STP16CP05 16 5 ÷ 100 ±1.5% (20÷100mA) ±5%
STP16CPS05 16 5 ÷ 100 ±1.5% (20÷100mA) ±5%
STP16DP05 16 5 ÷ 100 ±1.5% (20÷100mA) ±5%
STP16DPS05 16 5 ÷ 100 ±1.5% (20÷100mA) ±5%
STP16CPP05 16 3 ÷ 40 ±1.2% (5÷40mA) ±5%
STP16CPPS05 16 3 ÷ 40 ±1% (5÷40mA) ±2%
STP16DPP05 16 3 ÷ 40 ±1% (5÷40mA) ±2%
STP16DPPS05 16 3 ÷ 40 ±1% (5÷40mA) ±2%
STP16CPC05 16 5 ÷ 100 ±1.5% (20÷100mA) ±5%
STP24DP05 24 5 ÷ 80±6% (5÷15mA)
±3% (15÷80mA)±6%
STP1612PW05 16 3 ÷ 60 ±1.5% (3÷60mA) ±6%
78
Main features
• 8 x 3 Channel groups of constant current
output channels
• Adjustable output current through one
external resistor for each group of 8-
channel (5-80mA)
• Short and Open Output Error Detection
• Serial Data IN / Parallel Data OUT
• Gradual output delay (30ns for each group
RGB)
• Low voltage power supply (3V to 5.5V)
• Thermal Shutdown with flag pin
• 25MHz Clock Frequency
Application
• Full-color High Resolution LED Display
• Colored Traffic Signs
STP24DP05 – 24 channels, 5-80mA LED driver
µC
STP24DP05
R1..8 G1..8 B1..8SPI
LED Block3.3v
Temperature
Sensor
OE
-
R/G
/B
DM
LE
5v
79
Main features
• 16 constant current output channels
• Adjustable output current through one external
resistor (3-60mA)
• Selectable 12/16-bit gray-scale brightness control
• Selectable enhanced PWM for “ghost effect”
reduction
• Short and open LED detection
• 8-bit current gain control, 256 steps in two
selectable ranges
• Gradual output delay (40ns for each group of 4
channels)
• Selectable 16-bit/256-bit serial data in format
• 30MHz clock frequency
Applications
• Video display LED panels
• RGB backlighting
• Special lighting
µC STP1612PW05
out1 out2 …... out16SPI
OE
DM
LE
VLED
REXT
µC STP1612PW05
out1 out2 …... out16SPI
OE
DM
LE
VLED
REXT
µC STP1612PW05
out1 out2 …... out16SPI
OE
DM
LE
VLED
REXT
STP1612PW05 – 16 channels, 3-60mA LED driver,
12/16 bit Gray-scale, 8-bit current gain control
Energy-Efficient Solutions for LED Lighting:
Brochure
http://www.st.com/stonline/products/promlit/pdf/brlig
hting1009.pdf
81
Presentation Outlook
ST LED Driver Product Range - overview
1. Energy-Efficient Solutions for LED Lighting
• Off-Line LED Drivers
• DC-DC Converters based Solutions
2. ST Solutions for Video Display / Matrix drivers
3. ST Solutions for Communication in Lighting
What is DMX 1/2
DMX = Digital MultipleX for remote control of advanced lighting system, including motorized lamps to set light intensity,
light color, lamp rotation
for Wired Communication systems (twisted pairs + RS485 as PHY) in Theatre Stage Lighting,
Exhibition Lighting…
82
What is DMX 2/2
DMX512 uses asynchronous data transmission up to 250kBd/s (to dimmers, scanner,
motorized decoder).
Serial transmission and daisy chain configuration up to 512 nodes (so called DMX
universe) with max time 22ms (no delay visible)
The multiple receivers are connected to the DMX host in a daisy-chain manner and
every packet goes through every receiver.
Very simple protocol – only 8bit data one after another
83
7x DMX channels
0 Lamp Intensity
1 Rotation X Axis (Course)
2 Rotation X Axis (Fine)
3 Tilt Y Axis (Course)
4 Tilt Y Axis (Fine)
5 Color Selection
6 Gobo SelectionLamp example
STEVAL-ILL030V1 - descriptionRef. design and DMX512 communications protocol algorithm based on
STM32• Follows DMX512 2008 Standard as well as timing constraints
• Configuration of a single board mode as transmitter, receiver or standalone
• LED Intensity Control using a 120Hz PWM from 0% to 100%
• Connection to multiple receivers up to 512 to a single host controller
• False packets rejection, reset sequence timing checking
• Two on-board 3W LEDs and jumper option for driving external LEDs
Typical Applications:
stage lighting TheatersChoreographic lighting automatic light systems
Documentation:• UM1004 (user manual) DMX512 based LED lighting solution
• UM0792: Demonstration firmware for the DMX-512 communication protocol transmitter based on the
STM32F103Zx
• UM0791: Demonstration firmware for the DMX-512 communication protocol receiver based on the STM32F103Zx
• SW code (.hex) available with the board. The application source (IDE IAR Embedded Workbench) is available
only on request and it is covered by license agreement.
Board Purpose:Make the DALI communication available also on STM8 microcontrollers and have a simple demonstrator. Allow targeting medium/small size customers for lighting control
Key Product:
STM32F103 LDS3985M33R (voltage reg) STCS1APUR ESDAULC6-3B6 (USB protection) STBP120AVDK6F (voltage prot.) ST485ABDR
DALI overview 1/3
What is DALI ?
DALI = Digital Addressable Lighting Interface for remote control of lighting devices (dimming, automatic on/off switching…)
DALI advantages:
simple wiring: use standards electrical installation cables (no special communication cables), no special wiring topology
simple installation: cable polarity independency, light source addressing
digital host control – use low cost microcontrollers on light source side (minimize light source price)
DALI MEMBERS: ABB - ALTENBURGER ELECTRONIC - BAG - B.E.G. - BTICINO -CABA - CEAG - DELMATIC - DIAL - DYNALITE - ECKERLE - eldoLED - ELTAM EIN HASHOFET - ERC - ERCO - ETAP - EUTRAC - FIFTH - GEWISS - GITRONICA -GERARD LIGHTING - HADLER - HELVAR - HÜCO - INFRANET PARTNERS - INSTA - LIGHTOLIER - LUTRON - MACKWELL - ME ELECTRONIC PRODUCTS LTD. -NIKO - OSRAM - PHILIPS LIGHTING - SANDER - SCEMTEC - SIMMTRONIC -SPITTLER - SVEA - TCI - TRIDONIC - UNIVERSAL LIGHTING TECHNOLOGIES -VOSSLOH-SCHWABE - WAGO- XAL GmbH- ZUMTOBEL
85
Example of DALI devices connection:
86
• Example of DALI wiring:
DALI overview 2/3
Typical application
A single control cable can be used to control several
different groups of lamps.
87
Group 1:
Halogen lamp on table
Group 2:
Circular Fluorescent Lamps
Group 3:
Halogen lamp on the walls
Group 4:
Halogen lamp near white Board
Group 5:
Halogen lamp behind
DALI overview 3/3
DALI Implementation
“Gateway” “Ballast controller”
Target of this marketing package
STEVAL-ILM001V1 - descriptionDALI communication interface - plug-in module for STM8S-DiscoverySW Library
• DALI physical layer (GPIO toggling)
• DALI stack
• New DALI standard compatible
• Example for STM8S-DISCOVERY
HW module
• Isolated DALI interface
• Level translation for microcontroller
• Current consumption limiter
Typical Applications: Home/building automation Lighting
Documentation:UM1032 (board) soon to be published
AN3298 (SW Library) soon to be published
SW code soon on www.st.com/stm8s -> Resources -> Firmware
Board Purpose:Make the DALI communication available also on STM8 microcontrollers and have a simple demonstrator. Allow targeting medium/small size customers for lighting control
Key Product: STM8 family STN1HNK60 STN93003
Note: STM8S-DISCOVERY is not included in the STEVAL-ILM001V1
SW Library
Main user application Example for STM8S-Discovery
DALI stack layer DALI commands implementation
HW independent (easily portable to STM32)
IO pin driver Physical and link layer of DALI interface (bit timing, bus error
recovery control, DALI frames transmission/reception)
Occupied resources:
2 GPIO pins – selectable (RX and TX) + 1 GPIO interrupt
1 Timer4 (DALI protocol timing) + 1 Timer interrupt
90
HW interface module
91
Current limiter
bipolar STN930003
Supply
selection
Transmitter
mosfet STN1HNK60
Bridge for
bipolar
connection
Driving Fluorescent Lamps
Analog ballasts
without power factor
control
(CFLs)
Analog ballasts with
power factor controlAdvanced digital ballasts
Self oscillating
(BIPOLARS)
Analog Control
(L6520 + MOSFET)
(L6520 + BIPOLARS)
Separate PFC part
(L6562A + L6574 + MOSFETs)
(L6562A + L6520 + MOSFET)
Combo solution
(L65685E + MOSFETs)
Separate PFC part
(TD22x + L638x + MOSFETs +
STM8)
Combo solution
(L6382 + STM8)
92
93
L6520 – New integrated ballast controller
10 : (1,1)
RHBCS
H.V.
Rpre
CRES
Ccp
CBLOCK
LRES
Cvcc
RE1
RE2
DZ2DZ1
HS
LS
Rst-up
2
3
4
8
EOL
PWM_det
VCC
LSD
L65207
HBCS6
HSD
5GND
1FPRE
ROUT2
ROUT1
PFC L6562A,
passive PFC or
directly from the
main
• The L6520 can work directly from the rectified main, with a passive
PFC or with the active PFC L6562A for the best performances
Pulse Transformer
94
L6520 – New integrated ballast controller
1 : (1,1)
RHBCS
H.V.
Rpre
CRES
Ccp
CBLOCK
LRES
Cvcc
RE1
RE2
DZ2DZ1
HS
LS
Rst-up
ROUT2
2
3
4
8
EOL
PWM_det
VCC
LSD
L65207
HBCS6
HSD
5GND
1FPRE
ROUT1
• No change from BJTs to MOSFETs
application apart form the Pulse Transformer
95
Internal Block Diagram
End Of Life
Hard Switching
Storage time
Programmable
Preheating
Current Control
Circuit
Drivers
V supply, UVLO, startup
• The digital core allows to integrate all the functions and protections, minimizing
the number of external components
THE END
THANK YOU !