Gnd1; Functional Description; Input Configuration - Philips Tda8946J Specification Sheet

Philips Semiconductors

8. Functional description

8.1 Input configuration
9397 750 06863
Product specification
Table 3: Pin description
Symbol Pin
n.c. 13
OUT2 14
GND2 15
V 16
CC2
OUT2+ 17
The TDA8946J 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 TDA8946J outputs are protected by an internal thermal shutdown protection
mechanism and a short-circuit protection.
The TDA8946J 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:
1
f =
---------------------------- -
i cut off –
2 R C
i i
For R = 45 k and C = 220 nF:
i i
f = ---------------------------------------------------------------- -
i cut off –
2 45 10
As shown in Equation 1
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
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.
Rev. 02 — 14 March 2000
2 x 15 W stereo BTL audio amplifier
...continued
Description
not connected
negative loudspeaker terminal 2
ground channel 2
supply voltage channel 2
positive loudspeaker terminal 2
load at THD = 10%, using a 18 V power supply and an
1
= 16 Hz
3 9 –
220 10
and 2, large capacitor values for the inputs are not
TDA8946J
15 W
, so
CC
(1)
(2)
© Philips Electronics N.V. 2000. All rights reserved.
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