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TDA7265
25 +25W STEREO AMPLIFIER WITH MUTE & ST-BY
WIDE SUPPLY VOLTAGE RANGE (UP TO25V ABS MAX.)
SPLIT SUPPLY
HIGH OUTPUT POWER25 + 25W @ THD =10%, RL = 8, VS = +20V
NO POP AT TURN-ON/OFF
MUTE (POP FREE)
STAND-BY FEATURE (LOW Iq)
SHORT CIRCUIT PROTECTION
THERMAL OVERLOAD PROTECTION
DESCRIPTION
The TDA7265 is class AB dual Audio power am-plifier assembled in the Multiwatt package, spe-cially designed for high quality sound applicationas Hi-Fi music centers and stereo TV sets.
April 2002
Multiwatt11
ORDERING NUMBER: TDA7265
+5V
18K15K
IN (L)
1F
15K 1FMUTE/ST-BY
GND
IN (R)1F
4.7
4.7
100nF
100nF
OUT (L)
OUT (R)
1000F
1000F
+VS
35
7
9
6
112
4+
+
-
-
D94AU085
RL (L)
RL (R)
-VS
P560
18K
IN- (L)8
10 IN- (R)
1
560
18K
Figure 1: Typical Application Circuit in Split Supply
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ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
VS DC Supply Voltage 25 V
IO Output Peak Current (internally limited) 4.5 A
Ptot Power Dissipation Tcase = 70C 30 W
Top Operating Temperature -20 to 85 CTstg, Tj Storage and Junction Temperature -40 to +150 C
1
2
3
4
5
6
7
9
10
11
8
IN+(1)
IN-(1)
GND
IN-(2)
IN+(2)
-VS
MUTE
OUTPUT(2)
+VS
OUTPUT(1)
-VS
TAB CONNECTED TO PIN 6 D95AU316
PIN CONNECTION (Top view)
THERMAL DATA
Symbol Description Value Unit
Rth j-case Thermal Resistance Junction-case Max 2 C/W
PLAY5V
R215K
IN (L)
C3 1F
R110K
C11F
MUTE
IN (R)C4 1F
R84.7
R71K
C70.1F
OUT (L)
OUT (R)
C51000F
+VS
35
7
9
6
112
4+
+
-
-
D96AU444A
OUT(L)
OUT(R)
GND
R430K
IN- (L)8
10
IN- (R)
1
R5
1K
R630K
R94.7
C9 470F
C10 470F
C80.1F
R315K
0MUTE
Q1BSX33
C60.1F
D1 5.1V
C2
100F
Fig 2: Typical Application Circuit in Single Supply
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ELECTRICAL CHARACTERISTICS (Refer to the test circuit, VS = + 20V; RL = 8; RS = 50;GV = 30dB; f = 1KHz;Tamb = 25C, unless otherwise specified.)
Symbol Parameter Test Condition Min. Typ. Max. Unit
VS Supply Range +5 +25 V
Iq Total Quiescent Current 80 130 mA
VOS Input Offset Voltage 20 +20 mVIb Non Inverting Input Bias Current 500 nA
PO Music Output Power (*) THD = 10%; RL = 8 ;VS = + 22.5V
32 W
PO Output Power THD = 10%RL = 8 ;VS + 16V; RL = 4
20 2525
WW
THD = 1%RL = 8 ;VS + 16V; RL = 4
2020
WW
THD Total Harmonic Distortion RL = 8 ; PO = 1W; f = 1KHz 0.01 %
RL = 8 ;PO = 0.1 to 15W;f = 100Hz to 15KHz
0.7 %
RL = 4 ; PO = 1W; f = 1KHz 0.02 %
RL = 4 ; VS + 16V;PO = 0.1 to 12W;f = 100Hz to 15KHz
1 %
CT Cross Talk f = 1KHzf = 10KHz
7060
dBdB
SR Slew Rate 10 V/ s
GOL Open Loop Voltage Gain 80 dB
eN Total Input Noise A Curvef = 20Hz to 22KHz
34 8
VV
Ri Input Resistance 15 20 K
SVR Supply Voltage Rejection(each channel)
fr = 100Hz Vr = 0.5V 60 dB
Tj Thermal Shut-downJunction Temperature
145 C
MUTE FUNCTION [ref: +VS]
VTMUTE Mute / Play Threshold -7 -6 -5 V
AM Mute Attenuation 60 70 dB
STAND-BY FUNCTION [ref: +VS]
VTST-BY Stand-by / Mute Threshold -3.5 -2.5 -1.5 V
AST-BY Stand-by Attenuation 110 dB
Iq ST-BY Quiescent Current @ Stand-by 3 mA
Note :(*) FULL POWER up to. VS = 22.5V with RL = 8 and VS = 16V with RL = 4MUSIC POWER is the maximal power which the amplifier is capable of producing across the rated load resistance (regardless of non linearity)
1 sec after the application of a sinusoidal input signal of frequency 1KHz.
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Figure 3: Quiescent Current vs. Supply Voltage Figure 4: Frequency Response
Figure 5: Output Power vs. Supply Voltage Figure 6: T.H.D. vs. Output Power
Figure 7: Output Power vs. Supply Voltage Figure 8: T.H.D. vs. Output Power
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Figure 9: Quiescent Current vs. Pin # 5 Voltage Figure 10: Attenuation vs. Pin # 5 Voltage
Figure 11: SVR vs. Frequency Figure 12: Crosstalk vs. Frequency
Figure 13: Power Dissipaton vs. Output Power Figure 14: Power Dissipaton vs. Output Power
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MUTE STAND-BY FUNCTION
The pin 5 (MUTE/STAND-BY) controls the ampli-fier status by two different thresholds, referred to+VS.
- When Vpin5 higher than = +VS - 2.5V theamplifier is in Stand-by mode and the finalstage generators are off
- when Vpin5 is between +VS - 2.5V and +VS- 6V the final stage current generators areswitched on and the amplifier is in mutemode
- when Vpin5 is lower than +VS - 6V the am-plifier is play mode.
t
OFF
STDBY
MUTE MUTE MUTE MUTE
PLAY STDBY PLAY OFF
STDBY
20
+VS(V)
-20
-VS
VIN(mV)
Vpin5(V)
VS
VS-2.5
VS-6VS-10
Iq(mA)
0
VOUT
(V)
D94AU086
Figure 15
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R3
IN (L)
C1
R2 C3MUTE/
ST-BY
GND
IN (R)C2
R7
R10
C8
C9
OUT (L)
OUT (R)
C6
C4
+VS
35
7
9
6
112
4+
+
-
-
D94AU087B
RL (L)
RL (R)
+VS
-VS
R9
R5
IN- (L)8
10 IN- (R)
1
SW1
R1
DZ
R4
SW2
C7
R8
R6
C5
Q1
ST-BY
MUTE
Figure 16: Test and Application Circuit (Stereo Configuration)
Figure 17: PC Board and Components Layout of the figure 15 (1:1 scale)
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COMPONENTSRECOMMENDED
VALUEPURPOSE
LARGER THANRECOMMENDED VALUE
SMALLER THANRECOMMENDED VALUE
R1 10K Mute Circuit Increase of DzBiasing Current
R2 15K Mute Circuit Vpin # 5 Shifted Downward Vpin # 5 Shifted Upward
R3 18K Mute Circuit Vpin # 5 Shifted Upward Vpin # 5 Shifted Downward
R4 15K Mute Circuit Vpin # 5 Shifted Upward Vpin # 5 Shifted Downward
R5, R8 18K Closed Loop GainSetting (*)
Increase of Gain
R6, R9 560 Decrease of Gain
R7, R10 4.7 Frequency Stability Danger of Oscillations Danger of Oscillations
C1, C2 1FInput DC
Decoupling
Higher Low Frequency
Cutoff
C3 1FSt-By/Mute TimeConstant
Larger On/Off Time Smaller On/Off Time
C4, C6 1000FSupply VoltageBypass
Danger of Oscillations
C5, C7 0.1FSupply VoltageBypass
Danger of Oscillations
C8, C9 0.1F Frequency Stability
Dz 5.1V Mute Circuit
Q1 BC107 Mute Circuit
(*) Closed loop gain has to be => 25dB
APPLICATIONS SUGGESTION(Demo Board Schematic)
The recommended values of the external compo-
nents are those shown are the demo board sche-matic different values can be used: the followingtable can help the designer.
MUTE, STAND-BY TRUTH TABLE
SW1 SW2
B A STAND-BY
B B STAND-BY
A A MUTE
A B PLAY
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BRIDGE APPLICATION
Another application suggestion concerns theBRIDGE configuration, where the two power am-plifiers are connected as shown by the schematicdiagram of figure. 18.This application shows, however, some operativelimits due to dissipation and current capability of
the output stage. For this reason, we reccomendto use the TDA7265 in bridge with the supply volt-age equal/lower than 16V when the load is 8;with higher loads (i.e.16), the amplifier can workcorrectly in the whole supply voltage range.
The detected characteristics of T.H.D. vs Poutand Frequency Response are shown in fig.19 andfig.20.With R1=8, Vs=+/-16V the maximum outputpower obtainable is 50W at T.D.H.=10%.The quiescent current remains unchanged withrespect to the stereo configuration (~80mA as
typical at Vs=+/-16V).The last point to take into consideration concernsthe short-circuit protection. As for the stereo appli-cation, the TDA7265 is fully protected against anykind of short-circuit ( between Out/Gnd, Out/+Vsand Out/-Vs).
Figure 19: Distortion vs. Output Power Figure 20: Frequency Response of the Bridge Ap-plications
1F
ST-BY/MUTE
1F
R5 4.7
R64.7
C70.1F
C90.1F
C50.1F
C41000F
+VS
35
7
9
6
112
4+
+
-
-
D94AU190
RLR2
560
R136K
8
10
1
R4560
R336K
C1
IN
C2
C30.1F
C61000F
-VS
C85.6nF
Figure 18: Bridge Application Circuit
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Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequencesof use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license isgranted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specification mentioned in this publication aresubject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics productsare not authorized for use as crit ical components in life support devices or systems without express written approval of STMicroelectronics.
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