TB2902HQ 데이터 시트보기 (PDF) - Toshiba

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TB2902HQ

Maximum Power 41 W BTL x 4-ch Audio Power IC

Toshiba 

4. External Component Values

TB2902HQ

Component Recommended

Name

Value

Purpose

C1

0.22 µF To eliminate DC

Effect

Lower than Recommended Higher than Recommended

Value

Value

Cut-off frequency becomes Cut-off frequency becomes

higher

lower

Notes

Pop noise is

concerned with

this capacitor.

To reduce ripple

C2

10 µF

To determine the Power ON/OFF time and turn Power ON/OFF time and turn

time of turn on

ON diag cycle shorter

ON diag cycle longer

diag

To provide

C3

0.1 µF

sufficient

Reduces noise and provides sufficient oscillation margin

oscillation margin

C4

1 µF

To reduce pop

noise

Pop noise becomes larger

Muting ON/OFF time is

shorter

Pop noise becomes smaller

Muting ON/OFF time is

longer

C5

3900 µF Ripple filter

Power supply ripple filtering

Note 3: In case of the recommended value not used.

5. Fast Mute Mode

This feature will normally be used to suppress pop noise resulting from VCC transients during engine

cranking condition.

The fast mute mode can be entered on receipt of a command via I2C bus.

Using the IB2 register and setting to ‘one’ the bit D6, it is possible to generate a fast I2C mute command.

If a fast mute command is received, this IC will operate and will discharge the capacitor C4 at pin16.

Therefore the Pop sound will be reduced compared to the condition when Fast Mute is not used in the

engine cranking condition.

5

2004-08-18

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