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Preliminary data sheet

Rev. 01 — 1 October 2004

10 of 32

Philips Semiconductors

TDA8922B

2

× 50 W class-D power amplifier

[1]

Hysteresis of 20 degrees will influence restart timing depending on heatsink size.

[2]

Only complete shut-down of amplifier if short-circuit impedance is below threshold of 1

Ω. 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 flexibility 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

filters. In this case the system operates as a mono BTL amplifier and with the same

loudspeaker impedance an approximately four times higher output power can be

obtained.

The input configuration for a mono BTL application is illustrated in Figure 6.

In the stereo 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.

Table 4:

Overview protections TDA8922B

Protection name

Complete shut-down

Restart directly

Restart every 100 ms

OTP

Y

Y [1]

N [1]

OCP

N [2]

Y [2]

N [2]

WP

Y [3]

YN

UVP

Y

N

Y

OVP

YYN

UBP

Y

N

Y

Fig 6.

Input configuration for mono BTL application.

IN1P

OUT1

power stage

mbl466

OUT2

SGND

IN1M

IN2P

IN2M