TB2932HQ 查看數據表（PDF） - Toshiba

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TB2932HQ

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

Toshiba 

TB2932HQ

Description for permanent diagnosis

This IC can provide permanent diagnosis under the following conditions, whether they occur before

or after turning ON:

-Short to GND

-Short to VCC

-Output to output short circuit

-Output offset detection

-Current detection for tweeter open

This permanent diagnosis is available not only with the diagnostic cycle byte: IB1 D6 set at 1 but

also when set at 0.

Additionally, the signal can be obtained by entering just a read command. It is not necessary to

write the data.

With permanent diagnosis fault detection, the first read data after fault removal will still show a

Fault. Therefore, it is necessary to obtain 3 or more readings in order to prevent a miss judgment.

For example, the speaker sometimes makes a large counter electro motive force which this IC could

recognize as a fault event.

Additionally, this permanent diagnosis is automatically on after the turning on diagnosis operation

finished therefore there is no need to send the extra command.

WRITE DATA

READ DATA

READ DATA

result faulty

READ DATA

result faulty

READ DATA

result not faulty

Pin10

ripple

voltage

Permanent diagnostic DATA

permitted time

Turn On diagnostic

DATA permitted time

Turn On diagnostic

acquisition time (80 ms typ.)

FAULT

event

FAULT

removed

Figure 5 Permanent Diagnosis Timing Chart for Each Short Detection

11

2009-02-02

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