TFA9843J データシートの表示（PDF） - NXP Semiconductors.

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TFA9843J

2-channel audio amplifier (SE: 1 W to 20 W or BTL: 4 W to 40 W)

NXP Semiconductors. 

Philips Semiconductors

TFA9843J

2-channel audio amplifier (2 x SE or 1 x BTL)

IN1+ 4

470 nF

Vi

IN2+ 1

60 kΩ

60 kΩ

CIV 3

VCC

9

VREF

MODE 7

MICRO-

CONTROLLER

STANDBY

MUTE

ON

TFA9843J

100 nF

VCC

1000 µF

8 OUT1+

+

RL

− 8Ω

2 OUT2−

SHORT-CIRCUIT

AND

TEMPERATURE

PROTECTION

VCC

0.5VCC 6 SVR

22 µF

5

GND

150 µF

MDB026

Fig 20. BTL application diagram.

Remark: Switching inductive loads, the output voltage can rise beyond the maximum

supply voltage of 28 V. At high supply voltage it is recommended to use (Schottky)

diodes to the supply voltage and ground.

13.2 Printed-circuit board

13.2.1 Layout and grounding

To obtain a high-level system performance, certain grounding techniques are

essential. The input reference grounds have to be tied with their respective source

grounds and must have separate tracks from the power ground tracks; this will

prevent the large (output) signal currents from interfering with the small AC input

signals. The small-signal ground tracks should be physically located as far as

possible from the power ground tracks. Supply and output tracks should be as wide

as possible for delivering maximum output power.

9397 750 12587

Preliminary data

Rev. 02 — 19 January 2004

© Koninklijke Philips Electronics N.V. 2004. All rights reserved.

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