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TFA9842J Datasheet(Fiches technique) 14 Page - NXP Semiconductors

Numéro de pièce TFA9842J
Description  2-channel audio amplifier; SE: 1 W to 7.5 W; BTL: 2 W to 15 W
Télécharger  21 Pages
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Fabricant  PHILIPS [NXP Semiconductors]
Site Internet  http://www.nxp.com
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 14 page
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Philips Semiconductors
TFA9842J
2-channel audio amplifier (2 x SE or 1 x BTL)
Preliminary data
Rev. 01 — 26 April 2004
14 of 21
9397 750 12013
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Remark: Because of switching inductive loads, the output voltage can rise beyond
the maximum supply voltage of 28 V. At high supply voltages, it is recommended to
use (Schottky) diodes to the supply voltage and ground.
13.1 Printed-circuit board
13.1.1
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.
Fig 13. BTL application diagram.
MICRO-
CONTROLLER
MDB804
60 k
60 k
22
µF
470 nF
150
µF
STANDBY
MUTE
ON
SHORT-CIRCUIT
AND
TEMPERATURE
PROTECTION
VREF
0.5VCC
VCC
VCC
9
4
IN1
+
IN2
+
OUT1
+
OUT2
SVR
CIV
MODE
1
3
7
8
2
6
5
GND
TFA9842J
Vi
VCC
1000
µF
100 nF
RL
8
+




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