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TDA8922B Datasheet, PDF (10/32 Pages) NXP Semiconductors – 2 X 50 W class-D power amplifier | |||
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Philips Semiconductors
TDA8922B
2 à 50 W class-D power ampliï¬er
Table 4: Overview protections TDA8922B
Protection name
Complete shut-down Restart directly
OTP
Y
Y [1]
OCP
N [2]
Y [2]
WP
Y [3]
Y
UVP
Y
N
OVP
Y
Y
UBP
Y
N
Restart every 100 ms
N [1]
N [2]
N
Y
N
Y
[1] Hysteresis of 20 degrees will inï¬uence restart timing depending on heatsink size.
[2] Only complete shut-down of ampliï¬er if short-circuit impedance is below threshold of 1 â¦. In all other cases
current limiting: resulting in clipping output signal.
[3] Fault condition detected during (every) transition between standby-to-mute and during restart after
activation of OCP (short to one of the supply lines).
8.4 Differential audio inputs
For a high common mode rejection ratio and a maximum of ï¬exibility in the application, the
audio inputs are fully differential. By connecting the inputs anti-parallel the phase of one of
the channels can be inverted, so that a load can be connected between the two output
ï¬lters. In this case the system operates as a mono BTL ampliï¬er and with the same
loudspeaker impedance an approximately four times higher output power can be
obtained.
The input conï¬guration for a mono BTL application is illustrated in Figure 6.
In the stereo single-ended conï¬guration 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.
IN1P
IN1M
Vin
IN2P
IN2M
OUT1
SGND
OUT2
power stage
mbl466
Fig 6. Input conï¬guration for mono BTL application.
9397 750 13357
Preliminary data sheet
Rev. 01 â 1 October 2004
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
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