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TDA8947J Datasheet(Fiches technique) 5 Page - NXP Semiconductors

Numéro de pièce TDA8947J
Description  4-channel audio amplifier (SE: 1 W to 25 W; BTL: 4 W to 50 W)
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Fabricant  PHILIPS [NXP Semiconductors]
Site Internet  http://www.nxp.com
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Philips Semiconductors
TDA8947J
4-channel audio amplifier
Preliminary data
Rev. 01 — 06 February 2004
5 of 24
9397 750 10779
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
8.
Functional description
8.1 Input configuration
The input cut-off frequency is:
(1)
For SE application Ri = 60 kΩ and Ci = 220 nF:
(2)
For BTL application Ri = 30 kΩ 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 BTL and/or SE amplifier with an all-NPN output stage,
capable of delivering a peak output current of 4 A.
Using the TDA8947J as a BTL amplifier offers the following advantages:
Low peak value of the supply current
Ripple frequency on the supply voltage is twice the signal frequency
No expensive DC-blocking capacitor
Good low frequency performance.
CIV
13
common input voltage decoupling
OUT3
14
inverted loudspeaker output of channel 3
GND2
15
ground of channels 3 and 4
VCC2
16
supply voltage channels 3 and 4
OUT4+
17
non inverted loudspeaker output of channel 4
TAB
-
back side tab or heats spreader has to be connected to
ground
Table 3:
Pin description…continued
Symbol
Pin
Description
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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