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TFA9842J Datasheet(Fiches technique) 4 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
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Fabricant  PHILIPS [NXP Semiconductors]
Site Internet  http://www.nxp.com
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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
4 of 21
9397 750 12013
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
7.2 Pin description
8.
Functional description
8.1 Input configuration
The input cut-off frequency is:
(1)
SE application: Ri =60kΩ and Ci = 220 nF:
(2)
BTL application: Ri =30kΩ and Ci = 470 nF:
(3)
As shown in Equation 2 and Equation 3, large capacitor values for the inputs are not
necessary, so the switch-on delay during charging of the input capacitors can be
minimized. This results in a good low frequency response and good switch-on
behavior.
8.2 Power amplifier
The power amplifier is a Single-Ended (SE) and/or Bridge-Tied Load (BTL) amplifier
with an all-NPN output stage, capable of delivering a peak output current of 3 A.
Using the TFA9842J as a BTL amplifier offers the following advantages:
Lower peak value of the supply current
Table 3:
Pin description
Symbol
Pin
Description
IN2+
1
input 2
OUT2
2
inverted loudspeaker terminal 2
CIV
3
common input voltage decoupling
IN1+
4
input 1
GND
5
ground
SVR
6
half supply voltage decoupling (ripple rejection)
MODE
7
mode selection input (standby, mute and operating)
OUT1+
8
non inverted loudspeaker terminal 1
VCC
9
supply voltage
TAB
-
back side tab or heats spreader has to be connected to ground
f
i cut
off
()
1
2
π R
i
C
i
×
()
-----------------------------
=
f
i cut
off
()
1
2
π 60 10
3
×
220
×
10
9
×
()
-----------------------------------------------------------------
12 Hz
==
f
i cut
off
()
1
2
π 30 10
3
×
470
×
10
9
×
()
-----------------------------------------------------------------
11 Hz
==




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