TDA8933 NXP Semiconductors, TDA8933 Datasheet - Page 12

• Manufacturer Part Number: TDA8933
• Description: Class-D audio amplifier
• Manufacturer: NXP Semiconductors

NXP Semiconductors
TDA8933_1
Preliminary data sheet
8.5 Diagnostic input and output
8.6 Differential inputs
Whenever one of the protections is triggered, except for TF, pin DIAG is activated to LOW
level (see
approximately 2.4 V. This internal reference supply can deliver approximately 50 A. The
DIAG pin refers to pin CGND.The diagnostic output signal during different short circuit
conditions is illustrated in
device into Fault mode.
For a high common-mode rejection ratio and for maximum flexibility in the application, the
audio inputs are fully differential. By connecting the inputs anti-parallel, the phase of one
of the two channels can be inverted, so that the amplifier can operate as a mono BTL
amplifier. The input configuration for a mono BTL application is illustrated in
In the single-ended configuration it is also recommended to connect the two differential
inputs in anti-phase. This has advantages for the current handling of the power supply at
low signal frequencies and minimizes supply pumping (see also
Fig 5. Diagnostic output for different kinds of short circuit conditions
Fig 6. Input configuration for a mono BTL application
Table
6). An internal reference supply will pull up the open-drain DIAG output to
2.4 V
0 V
audio
input
V
o
Rev. 01 — 15 May 2007
Figure
50 ms
shorted load
IN1P
IN1N
IN2P
IN2N
5. Using pin DIAG as input, a voltage < 0.8 V will put the
50 ms
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amplifier
restart
2.4 V
0 V
V
o
OUT1
OUT2
no restart
supply line
Class-D audio amplifier
Section
short to
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TDA8933
© NXP B.V. 2007. All rights reserved.
14.8).
Figure
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6.
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