terminals for monitoring bus voltage - microchip...

Supertex inc.

Supertex inc. www.supertex.com

HV9971DB1

Doc.# DSDB-HV9971DB1A032913

Isolated, Constant CurrentHV9971 LED Driver Demoboard

Board Layout and Connection Diagram

1. Input Voltage: Connect the AC input voltage between in-put terminals as shown.

2. LED String: Connect the LED strings between +VO and -VO as shown (anode of the string to +VO and cathode to -VO).

3. DC Voltage: Use terminals either for measurement of the bus voltage or the DC voltage input

Connections

VAC = 180 - 265VAC VOUT = 18 - 24V

IOUT = 330mA

+-

- +

Terminals forMonitoringBus Voltage

Specification ValueInput line voltage 180 – 265VACOutput voltage 18 – 24VOutput current 330mASwitching frequency 75 – 120kHz

Typical efficiency 82%@Low Line,81%@High Line

Open LED protection 30VOutput short circuit protection HiccupPower factor ≥82%

Specifications

2

HV9971DB1



HV9971DB1 Schematic Diagram

BR

1

VD VIN

BIA

S

PWM

D

3 2 1 4

8 7 6 5

U1

HV9

971

9 10 8 7 6

T1

G

D S

M1

IRFU

C20

PB

F

C7

680p

F25

0vA

C

D4

ES

1M(S

MA

)

D3

ES

1D(S

MA

)D

21N

4148

(SO

D12

3)

RF1 10

+VIN

-VO

+VO

AC

1

AC

2

R1 10

(not

inst

alle

d)

R2 10

(not

inst

alle

d)

R6 0

1/2W

GN

D

PW

MD

C1

0.1µ

F40

0V

(2.8

25)

VDD

GA

TE

GN

D CS

1 2 3 4 5

+ -

C11

47nF

500V

C9

47nF

500V

C10

3.3µ

F40

0V

L 222

00µH

C2

3.3µ

F40

0V

C4

22µF

16V

C6

20pF

630V

C8

10µF 50V

(121

0)C

30.

5pF

(060

3)

C5

10pF

RB

IAS

13.3

k

RS

-A3.

48(1

206)

RS

-B15 (1

206)

RD

D37

41/

4W

R5

1.1k

1/4W

R4

1.91

k

R3

10

L 122

00µH

D5

ES

1M(S

MA

)

D6

ES

1M(S

MA

)

RD

93.1

k(1

206)

RIN

953k

(120

6)

D1

US

1J(S

MA

)

VR

1B

ZG03

C18

0(S

MA

)

Not

e: B

ias

win

ding

of t

his

trans

form

er (p

ins

4, 5

) is

used

in F

ORW

ARD

conn

ectio

n!Se

e pa

ge 1

0 fo

r tra

nsfo

rmer

elec

trica

l dia

gram

.

3

HV9971DB1



PCB Layout

Through-Hole Component Side

Solder Side

4

HV9971DB1



PCB Assembly Drawings

Through-Hole Component Side

Solder Side

5

HV9971DB1



Typical Characteristics

Figure 1. DC Line Regulation

Figure 2. DC Efficiency @25OC

VDCIN, V

350

340

330

320

310

300

290

280

270

I OU

T, (m

A)

120 140 160 180 200 220 240 260 280 300 320 340 360

VOUT = 24.4VVOUT = 18.4V103% *lOUT,NOM

97% *IOUT,NOM

Effic

ienc

y (%

)

VDCIN, (V)

100

95

90

85

80

75

70

65

60

55

50120 140 160 180 200 220 240 260 280 300 320 340 360

VOUT = 24.4VVOUT = 14.4V

Figure 3. AC Line Regulation

350

340

330

320

310

300

290

280

270

I OU

T, (m

A)

VACIN, (V)

180 190 200 210 220 230 240 250 260 270 280

VOUT = 24.4VVOUT = 18.4V103% *lOUT,NOM

97% *IOUT,NOM

6

HV9971DB1



Typical Characteristics (cont.)

Figure 4. AC Efficiency @25OC

Figure 5. Power Factor

Figure 6. IOUT Temperature Regulation

Effic

ienc

y (%

)

VACIN, (V)

100

95

90

85

80

75

70

65

60

55

50180 190 200 210 220 230 240 250 260 270 280


VACIN, (V)

Pow

er F

acto

r

1.0

0.9

0.8

0.7

0.6

0.5180 190 200 210 220 230 240 250 260 270


350

340

330

320

310

300

290

280

270

260

25020 30 40 50 60 70 80

Ambient. temp., (OC)

I OU

T, (m

A)

lOUT @ VOUT = 24V, VIN = 170VlOUT @ VOUT = 24V, VIN = 330VlOUT @ VOUT = 18V, VIN = 170VlOUT @ VOUT = 18V, VIN = 330V103% * lOUT,NOM

97% * lOUT,NOM

7

HV9971DB1



Typical Waveforms

Figure 7. Output current (green trace, 100mA/div),drain voltage (yellow trace, 100V/div) and bus voltage (purple trace, 100V/div) @VLINE = 230VAC

Figure 8. Output current (green trace, 100mA/div), drain voltage (yellow trace, 100V/div) and bus voltage (purple trace, 100V/div) @VLINE = 230VAC

Figure 9. Output current (green trace, 100mA/div),and bus voltage (yellow trace, 100V/div) @VLINE = 230VAC

Figure 10. Drain voltage (yellow trace, 100V/div)@VIN = 375VDC and LED open

8

HV9971DB1



Typical Waveforms (cont.)

Figure 11. Output diode current (green trace, 1A/div), @VIN = 170VDC and short across LED

Figure 12. Output diode current (green trace, 1A/div), @VIN = 170VDC and short across LED

Figure 13. Line voltage and line current @VAC = 180V Figure 14. Line voltage and line current @VAC = 270V

9

HV9971DB1



# Quan Ref. Des. Description Package Manufacturer ManufacturerPart #

1 1 BR1 Rect bridge GP 600V 0.8A Mini-Dip Diodes inc. HD06-T

2 1 C1 0.1µF 400V radial capacitor Thru-hole Epcos B32529E6104J000

3 2 C2, C10 3.3µF 400V elect vy radial capacitor Thru-hole Nichicon UVZ2G3R3MPD

4 1 C3 0.5pF 50V ceramic chip capacitor SMT0603 Yageo CC0603CRNP09BNR50

5 1 C4 22µF 16V alum elect capacitor Thru-hole Panasonic ECG ECE-A1CKA220

6 1 C5 10pF 50V ceramic chip capacitor SMT0805 Yageo CC0805JRNP09BRN100

7 1 C6 20pF 630V ceramic chip capacitor SMT1206 Kemet C1206C200JBRACTU

8 1 C7 680 pF 250VAC capacitor Thru-hole Murata DE2B3KH681KA3B

9 1 C8 10µF 50V ceramic chip capacitor SMT1210 Taiyo Yuden UMK325C7106MM-T

10 2 C9, C10 47nF 500 ceramic chip capacitor SMT1206 Vishay VJ1206Y473KXEAT5Z

11 1 D1 Diode ultra fast switch 600V 1A SMA Diodes inc. US1J-13-F

12 1 D2 Diode switch 75V 400mW SOD123 Diodes inc. 1N4148W-7-F

13 1 D3 Diode fast rec 200V 1A SMA Diodes inc. ES1D-13-F

14 3 D4, D5, D6 Diode fast rec 1000V 1A SMA Micro Comm ES1M-TP

15 2 L1, L2 2.2mH 0.20A inductor SMT Murata 13R225C

16 1 M1 600V 2A N-channel MOSFET I-PAK Vishay IRFUC20PBF

17 1 RDD 374Ω 1% resistor 1/4WThru-hole Any ---

18 1 RIN 953kΩ 1% resistor SMT1206 Any ---

19 1 RD 95.3kΩ 1% resistor SMT1206 Any ---

20 1 RBIAS 13.3kΩ 1% resistor SMT0805 Any ---

21 1 RS-A 3.48Ω 1% resistor SMT1206 Any (3.48//15) = 2.825

22 1 RS-B 15.0Ω 1% resistor SMT1206 Any (3.48//15) = 2.825

23 1 RF1 10Ω 5% 2W MF fusible resistor 1/4WThru-hole Vishay ---

24 2 R1, R2 Not Installed SMT1206 Any ---

25 1 R3 10Ω 1% resistor SMT0805 Any ---

26 1 R4 1.91kΩ 1% resistor SMT0805 Any ---

27 1 R5 1.1kΩ 1% resistor 1/4WThru-hole Any ---

28 1 R6 0Ω JumperWire - ---

29 1 T1 Custom transformer Thru-hole Any ---

30 1 U1 LED Driver IC SOIC-8 Supertex HV9971LG-G

31 1 VR1 Diode Zener 180V 600W 5% SMA Vishay BZG03C180TR

Bill of Materials

Supertex inc. does not recommend the use of its products in life support applications, and will not knowingly sell them for use in such applications unless it receivesan adequate “product liability indemnification insurance agreement.” Supertex inc. does not assume responsibility for use of devices described, and limits its liabilityto the replacement of the devices determined defective due to workmanship. No responsibility is assumed for possible omissions and inaccuracies. Circuitry andspecifications are subject to change without notice. For the latest product specifications refer to the Supertex inc. (website: http//www.supertex.com)

©2013 Supertex inc. All rights reserved. Unauthorized use or reproduction is prohibited. Supertex inc.1235 Bordeaux Drive, Sunnyvale, CA 94089

Tel: 408-222-8888www.supertex.com10

HV9971DB1


WD2 (1st Primary)70T - #34 AWG

1

2

3

FL1

FL2

9

8

10

4

5

WD4 (2nd Primary)37T - #34 AWG WD3 (Bias)

10TX2 - #30 AWG

WD5 (Secondary)12T - #25 AWG

WD1 (Secondary)11T - #25 AWG TIW

Flyback Transformer Specifications

Transformer Electrical Diagram

Transformer Electrical SpecificationsElectrical strength From pins 1-3 to pins 8-10 1second, AC 60Hz 3000VAC

Primary inductance Pins 1, 3 all other windings open, at 100kHz 916μH, ±10%

Resonant frequency Pins 1, 3 all other windings open 750KHz (min.)

Primary leakage inductance Pins 1, 3, leads 9, 10 shorted 18μH (max.)

Transformer Bill of MaterialsItem Description

1 Core: RENCO E16/8/5 (or equivalent), Al = 80nH/T^2

2 Bobbin: E/16/8/5 vertical, 10pin or equivalent

3 Triple insulated wire: #25 AWG

4 Magnet wire: #34 AWG

5 Magnet wire: #30 AWG

6 Tape: 3M 1298 Polyester Film, 8mm wide, 2.0mils thick or equivalent

7 Tape: 3M 1298 Polyester Film, 4.7mm wide, 2.0mils thick or equivalent

8 Varnish: Dolph BC-359 or equivalent

Transformer Build Diagram

WD5 (2nd Secondary)

12T - #25 AWG TIW

WD4 (2nd Primary)

37T - #34 AWG

WD3 (Bias)

10TX2 - #30 AWG

WD2 (1st Primary)

70T - #34 AWG

WD1 (Secondary)

11T - #25 AWG TIW

10

3

5

4

FL2 2

1

FL1 8

9

terminals for monitoring bus voltage - microchip...

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