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TB2932HQ

Maximum Power 49 W BTL × 4-ch Audio Power IC

Toshiba 

TB2932HQ

Regarding operation of the output offset detection, The software always detects the output offset

but the result is not latched internally as shown in the Figure below:

WRITE DATA

Pin10

ripple

voltage

READ DATA

result faulty

READ DATA

result not faulty

Correct Tvos

Correct Tvos

READ DATA

result not faulty

Permanent diagnostic DATA

permitted time

Turn On diagnostic

DATA permitted time

Turn On diagnostic

acquisition time (80 ms typ.)

FAULT

event

FAULT

removed

Figure 6 Software Output Offset Detection Timing Chart

However, this detection has to be performed in real time: Time voltage offset (Tvos) between read

and next read is set at Tvos = 1/the lowest signal frequency ,or more. For instance Tvos > 50 ms if the

lowest output signal frequency is 20 Hz, and to obtain 2 or more readings in order not to make a

misjudgment

Additionaly, the threshold level is designed at +/−2 V.

12

2009-02-02

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