Philips TDA1521A User Manual
INTEGRATED CIRCUITS
DATA SH EET
TDA1521A
2 x 6 W hi-fi audio power amplifier
Product specification
File under Integrated Circuits, IC01
July 1994
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
Stereo applications
Supply voltage range V
P
± 7,5 to ± 21,0 V
Output power at THD = 0,5%,
V
= ± 12 V P
P
Voltage gain G
Gain balance between channels ∆G
o
V
V
typ. 6 W
typ. 30 dB
typ. 0,2 dB
Ripple rejection SVRR typ. 60 dB
Channel separation α typ. 70 dB
Noise output voltage V
no(rms)
typ. 70 µV
PACKAGE OUTLINE
TDA1521A: 9-lead single in-line; plastic power (SOT 110B); SOT110-1; 1996 July 22.
July 1994 2
Philips Semiconductors Product specification
2 x 6 W hi-fi audio power amplifier TDA1521A
Fig.1 Block diagram.
July 1994 3
Philips Semiconductors Product specification
2 x 6 W hi-fi audio power amplifier TDA1521A
PINNING
1 −INV1 non-inverting input 1
2 INV1 inverting input 1 ground (asymmetrical)
3 GND
ground (symmetrical) 6 OUT2 output 2
1
⁄2VP(asymmetrical) 7 + V
5 −V
P
negative supply (symmetrical)
positive supply
P
4 OUT1 output 1 8 INV2 inverting input 2
9 −INV2 non-inverting input 2
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 8Ωload 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)
PARAMETER CONDITIONS SYMBOL MIN. MAX. UNIT
Supply voltage pin 7 V
pin 5 −VP= V
Non-repetitive peak
pins 4 and 6 I
P
OSM
= V
7-3
5-3
− +21 V
−−21 V
− 4A
output current
Total power dissipation see Fig.2 P
Storage temperature range T
Junction temperature T
tot
stg
j
−55 + 150 °C
− 150 °C
Short-circuit time: see note 1
outputs short-circuited
to ground symmetrical
(full signal drive) power supply t
sc
− 1 hour
asymmetrical
power supply t
sc
− 1 hour
Note
1. For asymmetrical power supplies (at short circuiting of the load) the maximum supply voltage is limited to V
= 28 V.
P
July 1994 4
Philips Semiconductors Product specification
2 x 6 W hi-fi audio power amplifier TDA1521A
Fig.2 Power derating curve.
THERMAL RESISTANCE
From junction to case R
th j-c
= 6 K/W
HEATSINK DESIGN EXAMPLE
With derating of 6 K/W, the value of heatsink thermal resistance is calculated as follows:
given RL = 8 Ω and 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
R
th h-a
150 60–
---------------------78,
6 5,5 K/W=–=
Note: The metal tab (heatsink) has the same potential as pin 5 ( − VP).
July 1994 5
Loading...