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Philips Semiconductors
2 x 6 W hi-fi audio power amplifier
PINNING
1
INV1
non-inverting input 1
2
INV1
inverting input 1
ground (symmetrical)
3
GND
1
V
(asymmetrical)
2
P
4
OUT1
output 1
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
a symmetrical power supply of
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 F 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
Supply voltage
Non-repetitive peak
output current
Total power dissipation
Storage temperature range
Junction temperature
Short-circuit time:
outputs short-circuited
to ground
(full signal drive)
Note
1. For asymmetrical power supplies (at short circuiting of the load) the maximum supply voltage is limited to V
July 1994
5
6
7
8
9
12 V.
CONDITIONS
pin 7
pin 5
pins 4 and 6
see Fig.2
see note 1
symmetrical
power supply
asymmetrical
power supply
negative supply (symmetrical)
V
P
ground (asymmetrical)
OUT2
output 2
+ V
positive supply
P
INV2
inverting input 2
INV2
non-inverting input 2
SYMBOL
V
= V
P
7-3
V
= V
P
5-3
I
OSM
P
tot
T
stg
T
j
t
sc
t
sc
4
Product specification
TDA1521A
load with
MIN.
MAX.
UNIT
+21
V
21
V
4
A
55
+ 150
C
150
C
1
hour
1
hour
= 28 V.
P
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