TDA8933B View Datasheet(PDF) - NXP Semiconductors.

Part Name

Description

Manufacturer

TDA8933B

Class-D audio amplifer

NXP Semiconductors. 

NXP Semiconductors

TDA8933B

Class D audio amplifier

8.5 Diagnostic input and output

Except for TF, whenever one of the protections is triggered pin DIAG is activated to LOW

level (see Table 6). An internal current source will pull up the open-drain DIAG output to

approximately 2.5 V. This current source can deliver approximately 50 µA. The DIAG pin

refers to pin CGND. The diagnostic output signal during different short circuit conditions is

illustrated in Figure 5. Using pin DIAG as input, a voltage < 0.8 V will put the device into

Fault mode.

Vo

2.4 V

Vo

2.4 V

amplifier

restart

0V

0V

≈ 50 ms ≈ 50 ms

shorted load

no restart

short to

supply line

001aad759

Fig 5. Diagnostic output for different short circuit conditions

8.6 Differential inputs

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 Figure 6.

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 Section 14.8).

audio

input

IN1P

IN1N

OUT1

IN2P

IN2N

OUT2

001aad760

Fig 6. Input configuration for a mono BTL application

TDA8933B_1

Preliminary data sheet

Rev. 01 — 23 October 2008

© NXP B.V. 2008. All rights reserved.

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