TDA8542TS 查看數據表（PDF） - Philips Electronics

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TDA8542TS

2 x 0.7 W BTL audio amplifier

Philips Electronics 

Philips Semiconductors

2 × 0.7 W BTL audio amplifier

Product specification

TDA8542TS

PINNING

SYMBOL

LGND

n.c.

OUTL+

MODE

SVR

BTL/SE

n.c.

OUTR+

n.c.

RGND

VCCR

n.c.

OUTR−

INR−

INR+

INL+

INL−

OUTL−

n.c.

VCCL

PIN

DESCRIPTION

1 ground, left channel

2 not connected

3 positive loudspeaker terminal,

left channel

4 operating mode select (standby,

mute, operating)

5 half supply voltage, decoupling

ripple rejection

6 BTL loudspeaker or SE

headphone operation

7 not connected

8 positive loudspeaker terminal,

right channel

9 not connected

10 ground, right channel

11 supply voltage, right channel

12 not connected

13 negative loudspeaker terminal,

right channel

14 negative input, right channel

15 positive input, right channel

16 positive input, left channel

17 negative input, left channel

18 negative loudspeaker terminal,

left channel

19 not connected

20 supply voltage, left channel

handbook, halfpage

LGND 1

n.c. 2

20 VCCL

19 n.c.

OUTL+ 3

18 OUTL−

MODE 4

17 INL−

SVR 5

16 INL+

TDA8542TS

BTL/SE 6

15 INR+

n.c. 7

14 INR−

OUTR+ 8

13 OUTR−

n.c. 9

12 n.c.

RGND 10

11 VCCR

MBK453

Fig.2 Pin configuration.

FUNCTIONAL DESCRIPTION

The TDA8542TS is a 2 × 0.7 W BTL audio power amplifier

capable of delivering 2 × 0.7 W output power to a 16 Ω

load at THD = 10% using a 5 V power supply. Using the

MODE pin the device can be switched to standby and

mute condition. The device is protected by an internal

thermal shutdown protection mechanism. The gain can be

set within a range from 6 to 30 dB by external feedback

resistors.

Power amplifier

The power amplifier is a Bridge-Tied Load (BTL) amplifier

with a complementary PNP-NPN output stage.

The voltage loss on the positive supply line is the

saturation voltage of a PNP power transistor, on the

negative side the saturation voltage of a NPN power

transistor. The total voltage loss is <1 V and with a 5 V

supply voltage and with a 16 Ω loudspeaker an output

power of 0.7 W can be delivered.

Mode select pin

The device is in the standby mode (with a very low current

consumption) if the voltage at the MODE pin is

>(VCC − 0.5 V), or if this pin is floating. At a MODE voltage

level of less than 0.5 V the amplifier is fully operational.

In the range between 1.5 V and VCC − 1.5 V the amplifier

is in mute condition. The mute condition is useful to

suppress plop noise at the output caused by charging of

the input capacitor.

1998 Mar 25

4

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