TDA8933B NXP Semiconductors, TDA8933B Datasheet - Page 11

• Manufacturer Part Number: TDA8933B
• Description: The TDA8933B is a high-efficiency class D amplifier with low power dissipation
• Manufacturer: NXP Semiconductors

NXP Semiconductors
TDA8933B_1
Preliminary data sheet
8.5 Diagnostic input and output
8.6 Differential inputs
Except for TF, whenever one of the protections is triggered pin DIAG is activated to LOW
level (see
approximately 2.5 V. This current source can deliver approximately 50 A. The DIAG pin
refers to pin CGND. The diagnostic output signal during different short circuit conditions is
illustrated in
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 then operate as a mono BTL
amplifier. The input configuration for a mono BTL application is illustrated in
In the SE 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.
Fig 6.
Diagnostic output for different short circuit conditions
Input configuration for a mono BTL application
Table
Figure
6). An internal current source will pull up the open-drain DIAG output to
2.4 V
audio
0 V
input
V
5. Using pin DIAG as input, a voltage < 0.8 V will put the device into
o
Rev. 01 — 23 October 2008
50 ms
shorted load
IN1P
IN1N
IN2P
IN2N
50 ms
amplifier
restart
2.4 V
0 V
V
o
Section
OUT1
OUT2
14.8).
no restart
supply line
Class D audio amplifier
short to
001aad760
001aad759
TDA8933B
© NXP B.V. 2008. All rights reserved.
Figure
11 of 42
6.