Philips TDA1521A User manual

DATA SHEET
Product specification
File under Integrated Circuits, IC01 July 1994
INTEGRATED CIRCUITS
TDA1521A
2 x 6 W hi-fi audio power amplifier

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Philips Semiconductors Product specification
2 x 6 W hi-fi audio power amplifier TDA1521A
GENERAL DESCRIPTION
The TDA1521A 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
•Requires very few external components
•Input muted during power-on and off
(no switch-on or switch-off clicks)
•Low offset voltage between output and ground
•Excellent gain balance between channels
•Hi-fi according to IEC 268 and DIN 45500
•Short-circuit-proof
•Thermally protected.
QUICK REFERENCE DATA
PACKAGE OUTLINE
TDA1521A: 9-lead single in-line; plastic power (SOT 110B); SOT110-1; 1996 July 22.
Stereo applications
Supply voltage range VP±7,5 to ±21,0 V
Output power at THD = 0,5%,
VP=±12 V Potyp. 6 W
Voltage gain GVtyp. 30 dB
Gain balance between channels ∆GVtyp. 0,2 dB
Ripple rejection SVRR typ. 60 dB
Channel separation αtyp. 70 dB
Noise output voltage Vno(rms) typ. 70 µV

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Philips Semiconductors Product specification
2 x 6 W hi-fi audio power amplifier TDA1521A
Fig.1 Block diagram.

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Philips Semiconductors Product specification
2 x 6 W hi-fi audio power amplifier TDA1521A
PINNING
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 ×6 watts (THD = 0,5%) can be delivered into an 8 Ωload with
a symmetrical power supply of ±12 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.12, the 100 µF 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)
Note
1. For asymmetrical power supplies (at short circuiting of the load) the maximum supply voltage is limited to VP= 28 V.
1−INV1 non-inverting input 1 5−VPnegative supply (symmetrical)
2 INV1 inverting input 1 ground (asymmetrical)
3 GND ground (symmetrical) 6 OUT2 output 2
1⁄2VP(asymmetrical) 7 + VPpositive supply
4 OUT1 output 1 8 INV2 inverting input 2
9−INV2 non-inverting input 2
PARAMETER CONDITIONS SYMBOL MIN. MAX. UNIT
Supply voltage pin 7 VP= V7-3 −+21 V
pin 5 −VP= V5-3 −−21 V
Non-repetitive peak
output current pins 4 and 6 IOSM −4A
Total power dissipation see Fig.2 Ptot
Storage temperature range Tstg −55 + 150 °C
Junction temperature Tj−150 °C
Short-circuit time: see note 1
outputs short-circuited
to ground symmetrical
(full signal drive) power supply tsc −1 hour
asymmetrical
power supply tsc −1 hour

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Philips Semiconductors Product specification
2 x 6 W hi-fi audio power amplifier TDA1521A
THERMAL RESISTANCE
HEATSINK DESIGN EXAMPLE
With derating of 6 K/W, the value of heatsink thermal resistance is calculated as follows:
given RL= 8 Ωand VP=±12 V, the measured maximum dissipation is 7,8 W; then, for a maximum ambient temperature
of 60 °C, the required thermal resistance of the heatsink is
Note: The metal tab (heatsink) has the same potential as pin 5 ( −VP).
From junction to case Rth j-c = 6 K/W
Fig.2 Power derating curve.
Rth h-a 150 60–
78,
---------------------- 6 5,5 K/W=–=

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Philips Semiconductors Product specification
2 x 6 W hi-fi audio power amplifier TDA1521A
CHARACTERISTICS
PARAMETER CONDITIONS SYMBOL MIN. TYP. MAX. UNIT
Supply voltage range
operating mode VP±7,5 ±12,0 ±20,0 V
input mute mode VP±2,0 −±5,8 V
Repetitive peak
output current IORM −−2,2 A
Operating mode: symmetrical power supply; test circuit as per Fig.11;
VP=±12 V; RL=8Ω; Tamb = 25 °C; f = 1 kHz
Total quiescent current without RLItot 18 40 70 mA
Output power THD = 0,5% Po56−W
THD = 10% Po6,5 8,0 −W
Total harmonic
distortion Po= 4 W THD −0,15 0,2 %
Power bandwidth THD = 0,5%
note 1 B 20 to
16 k Hz
Voltage gain Gv29 30 31 dB
Gain balance ∆Gv−0,2 1,0 dB
Noise output voltage
(r.m.s. value);
unweighted (20 Hz
to 20 kHz) RS= 2 kΩVno(rms) −70 140 µV
Input impedance |Zi| 142026kΩ
Ripple rejection note 2 SVRR 40 60 −dB
Channel separation RS= 0 Ωα 46 70 −dB
Input bias current Iib −0,3 −µA
DC output offset with respect
voltage to ground VOFF −30 200 mV
Input mute mode: symmetrical power supply; test circuit as per Fig.11;
VP=±4 V; RL= 8 Ω; Tamb = 25 °C; f = 1 kHz
Total quiescent current without RLItot 9 3040mA
Output voltage Vi= 600 mV Vout −0,6 1,8 mV
Noise output voltage
(r.m.s. value);
unweighted (20 Hz to 20 kHz) RS= 2 kΩVno(rms) −70 140 µV
Ripple rejection note 2 SVRR 35 55 −dB
DC output offset with respect
voltage to ground VOFF −40 200 mV

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Philips Semiconductors Product specification
2 x 6 W hi-fi audio power amplifier TDA1521A
Notes to the characteristics
1. Power bandwidth at Po max −3 dB.
2. Ripple rejection at RS=0Ω, f = 100 Hz to 20 kHz; ripple voltage = 200 mV (r.m.s. value) applied to positive or
negative supply rail.
Operating mode: asymmetrical power supply; test circuit as per Fig.12;
VP= 24 V; RL=8Ω; Tamb = 25 °C; f = 1 kHz
Total quiescent current Itot 18 40 70 mA
Output power THD = 0,5% Po56−W
THD = 10% Po6,5 8 −W
Total harmonic distortion Po= 4 W THD −0,13 0,2 %
Power bandwidth THD = 0,5% 40 to
note 1 B 16 k Hz
Voltage gain Gv29 30 31 dB
Gain balance ∆Gv−0,2 1,0 dB
Noise output voltage
(r.m.s. value);
unweighted (20 Hz to 20 kHz) RS= 2 kΩVno(rms) −70 140 µV
Input impedance |Zi| 1420 26kΩ
Ripple rejection SVRR 35 44 − dB
Channel separation RS= 0 Ωα −45 −dB
PARAMETER CONDITIONS SYMBOL MIN. TYP. MAX. UNIT

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Philips Semiconductors Product specification
2 x 6 W hi-fi audio power amplifier TDA1521A
APPLICATION INFORMATION
Input mute circuit
The input mute circuit operates only during switching on and off of the supply voltage. The circuit compares the 1⁄2supply
voltage (at pin 3) with an internally fixed reference voltage (Vref), derived directly from the supply voltage. When the
voltage at pin 3 is lower than Vref the non-inverting inputs (pins 1 and 9) are disconnected from the amplifier. The voltage
at pin 3 is determined by an internal voltage divider and the external 100 µF capacitor.
During switching on, a time delay is created between the reference voltage and the voltage at pin 3, during which the
input terminal is disconnected, (as illustrated in Fig.3).
Fig.3 Input mute circuit; time delay.

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Philips Semiconductors Product specification
2 x 6 W hi-fi audio power amplifier TDA1521A
Fig.4 Output power as a function of supply voltage; symmetrical supply; RL=8Ω; f = 1 kHz.
Fig.5 Distortion as a function of frequency; symmetrical supply; VP=±12 V; RL=8Ω; Po= 3 W.

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Philips Semiconductors Product specification
2 x 6 W hi-fi audio power amplifier TDA1521A
Fig.6 Supply voltage ripple rejection; symmetrical supply, VP=±12 V; VRR = 200 mV.
Fig.7 Power dissipation as a function of output power; asymmetrical supply; VS= 24 V; RL=8Ω; f = 1 kHz.