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INTEGRATED CIRCUITS
DATA SHEET
TDA1521
TDA1521Q
2 x 12 W hi-fi audio power amplifier
Product specification |
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July 1994 |
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File under Integrated Circuits, IC01 |
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Philips Semiconductors |
Product specification |
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2 x 12 W hi-fi audio power amplifier
TDA1521
TDA1521Q
GENERAL DESCRIPTION
The TDA1521/TDA1521Q is a dual hi-fi audio power amplifier encapsulated in a 9-lead plastic power package. The device is especially designed for mains fed applications (e.g. stereo tv sound and stereo radio).
Features |
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Requires very few external components |
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Input muted during power-on and off |
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(no switch-on or switch-off clicks) |
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Low offset voltage between output and ground |
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Excellent gain balance between channels |
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Hi-fi according to IEC 268 and DIN 45500 |
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∙ Short-circuit-proof |
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Thermally protected |
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QUICK REFERENCE DATA |
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Stereo applications |
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Supply voltage range |
VP |
± 7,5 to ± 21,0 |
V |
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Output power at THD = 0,5%, |
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VP = ± 16 V |
PO |
typ. |
12 |
W |
Voltage gain |
Gv |
typ. |
30 |
dB |
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Gain balance between channels |
Gv |
typ. |
0,2 |
dB |
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Ripple rejection |
SVRR |
typ. |
60 |
dB |
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Channel separation |
α |
typ. |
70 |
dB |
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Noise output voltage |
Vno(rms) |
typ. |
70 |
μV |
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PACKAGE OUTLINES
TDA1521: 9 leads in-line; plastic power (SOT131); SOT131-1; 1996 August 20. TDA1521Q: 9 leads SIL-bent-to-DIL; plastic power (SOT157); SOT157-2; 1996 August 20.
July 1994 |
2 |
Philips Semiconductors |
Product specification |
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2 x 12 W hi-fi audio power amplifier
TDA1521
TDA1521Q
Fig.1 Block diagram.
PINNING
1 |
-INV1 |
non-inverting input 1 |
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2 |
INV1 |
inverting input 1 |
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3 |
GND |
ground (symmetrical) |
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1¤2 VP (asymmetrical) |
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4 |
OUT1 |
output 1 |
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5 |
-VP |
negative supply (symmetrical) |
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ground (asymmetrical) |
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6 |
OUT2 |
output 2 |
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7 |
+VP |
positive supply |
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8 |
INV2 |
inverting input 2 |
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9 |
-INV2 |
non-inverting input 2 |
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July 1994 |
3 |
Philips Semiconductors |
Product specification |
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2 x 12 W hi-fi audio power amplifier
TDA1521
TDA1521Q
FUNCTIONAL DESCRIPTION
This hi-fi stereo power amplifier is designed for mains fed applications. The circuit is designed for both symmetrical and asymmetrical power supply systems. An output power of 2 ´ 12 watts (THD = 0,5%) can be delivered into an 8 W load with a symmetrical power supply of ± 16 V.
The gain is fixed internally at 30 dB. Internal gain fixing gives low gain spread and very good balance between the amplifiers (0,2 dB).
A special feature of this device is a mute circuit which suppresses unwanted input signals during switching on and off. Referring to Fig.13, the 100 mF capacitor creates a time delay when the voltage at pin 3 is lower than an internally fixed reference voltage. During the delay the amplifiers remain in their DC operating mode but are isolated from the non-inverting inputs on pins 1 and 9.
Two thermal protection circuits are provided, one monitors the average junction temperature and the other the instantaneous temperature of the power transistors. Both protection circuits activate at 150 °C allowing safe operation to a maximum junction temperature of 150°C without added distortion.
RATINGS
Limiting values in accordance with the Absolute Maximum System (IEC 134)
PARAMETER |
CONDITIONS |
SYMBOL |
MIN. |
MAX. |
UNIT |
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Supply voltage |
pin 7 |
VP = V7-3 |
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+21 |
V |
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pin 5 |
-VP = V5-3 |
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-21 |
V |
Non-repetitive peak |
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output current |
pins 4 and 6 |
IOSM |
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4 |
A |
Total power dissipation |
see Fig.2 |
Ptot |
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Storage temperature range |
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Tstg |
-55 |
+150 |
°C |
Junction temperature |
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Tj |
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150 |
°C |
Short-circuit time: |
see note |
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outputs short-circuited |
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to ground |
symmetrical |
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(full signal drive) |
power supply |
tsc |
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1 |
hour |
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asymmetrical |
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power supply; |
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VP < 32 V |
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(unloaded); |
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Ri ³ 4 W |
tsc |
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1 |
hour |
Note
For asymmetrical power supplies (at short circuiting of the load) the maximum supply voltage is limited to VP = 28 V. If the total internal resistance of the supply (Ri) > 4 W, the maximum unloaded supply voltage is increased to 32 V.
July 1994 |
4 |
Philips Semiconductors |
Product specification |
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2 x 12 W hi-fi audio power amplifier
TDA1521
TDA1521Q
Fig.2 Power derating curve.
THERMAL RESISTANCE
From junction to case |
Rth j-c = 2,5 K/W |
HEATSINK DESIGN EXAMPLE
With derating of 2,5 K/W, the value of heatsink thermal resistance is calculated as follows:
given RL = 8 W and VP = ±16 V, the measured maximum dissipation is 14,6 W; then, for a maximum ambient temperature of 65 °C, the required thermal resistance of the heatsink is
150 –65 ¤
= ----------------------, –2,5= 3,3 K W 14 6
Note: The internal metal block (heatsink) has the same potential as pin 5 (-VP).
July 1994 |
5 |
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