TDA8944 Philips Semiconductors, TDA8944 Datasheet - Page 4

• Manufacturer Part Number: TDA8944
• Description: 2 x 7 W stereo Bridge Tied Load BTL audio amplifier
• Manufacturer: Philips Semiconductors

8. Functional description
Philips Semiconductors
9397 750 06861
Product specification
8.1 Input configuration
Table 3:
The TDA8944J is a stereo BTL audio power amplifier capable of delivering 2
output power to an 8
external heatsink. The voltage gain is fixed at 32 dB.
With the three-level MODE input the device can be switched from ‘standby’ to ‘mute’
and to ‘operating’ mode.
The TDA8944J outputs are protected by an internal thermal shutdown protection
mechanism and a short-circuit protection.
The TDA8944J inputs can be driven symmetrical (floating) as well as asymmetrical.
In the asymmetrical mode one input pin is connected via a capacitor to the signal
ground which should be as close as possible to the SVR (electrolytic) capacitor
ground. Note that the DC level of the input pins is half of the supply voltage V
coupling capacitors for both pins are necessary.
The input cut-off frequency is:
For R
As shown in
necessary;
minimized. This results in a good low frequency response and good switch-on
behaviour.
Remark: To prevent HF oscillations do not leave the inputs open, connect a capacitor
of at least 1.5 nF across the input pins close to the device.
Symbol
n.c.
OUT2
GND2
V
OUT2+
CC2
i
f
= 45 k and C
i cut off
Pin description
–
so the switch-on delay during charging of the input capacitors, can be
Equation 1
=
Pin
13
14
15
16
17
f
Rev. 02 — 14 February 2000
i cut off
------------------------------------------------------------------ -
2
–
i
–
= 220 nF:
45 10
load at THD = 10%, using a 12 V power supply and an
and 2, large capacitor values for the inputs are not
…continued
=
Description
not connected
negative loudspeaker terminal 2
ground channel 2
supply voltage channel 2
positive loudspeaker terminal 2
------------------------------ -
2
3
1
–
220 10
R
1
i
C
i
9 –
=
16 Hz
2 x 7 W stereo BTL audio amplifier
© Philips Electronics N.V. 2000. All rights reserved.
TDA8944J
CC
7 W
, so
4 of 21
(1)
(2)