tda1521.pdf

INTEGRATED CIRCUITS

DATA SHEET

TDA1521

TDA1521Q

2 x 12 W hi-fi audio power amplifier

Product speciﬁcation

File under Integrated Circuits, IC01

July 1994

Philips Semiconductors

Product speciﬁcation

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

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 P =

16 V

P O

typ.

Voltage gain

G v

typ.

Gain balance between channels

D G v

typ.

0,2

Ripple rejection

SVRR

typ.

Channel separation

typ.

Noise output voltage

V no(rms) typ.

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

Philips Semiconductors

Product speciﬁcation

2 x 12 W hi-ﬁ audio power ampliﬁer

TDA1521

TDA1521Q

Fig.1 Block diagram.

PINNING

INV1

non-inverting input 1

- V P

negative supply (symmetrical)

ground (asymmetrical)

INV1

inverting input 1

GND

ground (symmetrical)

OUT2

output 2

¤ 2 V P (asymmetrical)

7 P

positive supply

OUT1

output 1

INV2

inverting input 2

INV2

non-inverting input 2

July 1994

Philips Semiconductors

Product speciﬁcation

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).

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

CONDITIONS

SYMBOL

MIN.

MAX.

UNIT

Supply voltage

pin 7

V P = V 7-3

+21

pin 5

V P = V 5-3

Non-repetitive peak

output current

pins 4 and 6

I OSM

Total power dissipation

see Fig.2

P tot

Storage temperature range

T stg

+150

Junction temperature

T j

150

Short-circuit time:

see note

outputs short-circuited

to ground

symmetrical

(full signal drive)

power supply

t sc

hour

asymmetrical

power supply;

V P < 32 V

(unloaded);

R i ³ 4 W

t sc

hour

Note

For asymmetrical power supplies (at short circuiting of the load) the maximum supply voltage is limited to V P = 28 V.

If the total internal resistance of the supply (R i ) > 4

, the maximum unloaded supply voltage is increased to 32 V.

July 1994

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

Philips Semiconductors

Product speciﬁcation

2 x 12 W hi-ﬁ audio power ampliﬁer

TDA1521

TDA1521Q

Fig.2 Power derating curve.

THERMAL RESISTANCE

From junction to case

R th 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 R L = 8

and V P =

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

–

14 6

R th h a

---------------------- 25 33 K W

–

Note: The internal metal block (heatsink) has the same potential as pin 5 (

V P ).

July 1994

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