TB2929 Просмотр технического описания (PDF) - Toshiba

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TB2929

TOSHIBA Bi-CMOS Linear Integrated Circuit Silicon Monolithic

Toshiba 

TB2929HQ

4. Prevention of speaker damage (in case of a layer short-circuit of the speaker)

When the DC resistance between the OUT+ and OUT− pins falls below 1 Ω, the output current exceeds 4 A.

At this time, the protection circuit is activated to limit the current draw into the speaker.

This feature prevents the speaker from being damaged, as follows:

< Speaker damaging scenario >

A DC current of over 4 V is applied to the speaker due to an external circuit failure (Note 4).

(Abnormal DC output offset)

↓

The speaker impedance becomes 1 Ω or less due to a layer short.

↓

A current of over 4 A flows into the speaker, damaging the speaker.

Current into the speaker

The short-circuit protection is activated

Less than 4 A

About 1 Ω 4 Ω

Figure 6

Speaker Impedance

Note 3: An abnormal DC offset voltage is incurred when the input bias to the power IC is lost due to a leakage

current from a coupling capacitor at the input or a short-circuit between the IN and adjacent lines.

6

2009-01-29

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