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TDA8932B Datasheet(PDF) 11 Page - NXP Semiconductors |
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TDA8932B Datasheet(HTML) 11 Page - NXP Semiconductors |
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11 / 48 page  TDA8932B_4 © NXP B.V. 2008. All rights reserved. Product data sheet Rev. 04 — 18 December 2008 11 of 48 NXP Semiconductors TDA8932B Class-D audio amplifier 8.5 Diagnostic input and output Whenever a protection other than TF is triggered, pin DIAG is forced LOW level (see Table 6). An internal reference supply will pull-up the open-drain DIAG output to approximately 2.4 V. This internal reference supply can deliver approximately 50 µA. Pin DIAG refers to pin CGND. The diagnostic output signal during different short conditions is illustrated in Figure 6. Using pin DIAG as input, a voltage < 0.8 V will put the device into Fault mode. 8.6 Differential 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 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 Figure 7. In 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). 8.7 Output voltage buffers When pin POWERUP is set HIGH, the half supply output voltage buffers are switched on in asymmetrical supply configuration. The start-up will be pop free since the device starts switching when the capacitor on pin HVPREF and the SE capacitors are completely charged. Output voltage buffers: Fig 6. Diagnostic output for different short-circuit conditions 001aad759 ≈ 50 ms shorted load amplifier restart no restart ≈ 50 ms 0 V 2.4 V Vo short to supply line 0 V 2.4 V Vo Fig 7. Input configuration for mono BTL application 001aad760 IN1P OUT1 audio input IN2P IN2N IN1N OUT2 |
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