TB2932HQ Ver la hoja de datos (PDF) - Toshiba

Número de pieza

componentes Descripción

Fabricante

TB2932HQ

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

Toshiba 

2.External Component Values

TB2932HQ

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

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

Pop noise is

C3

0.1 μF

To provide

sufficient

Reduces noise and provides sufficient oscillation margin

concerned with

this capacitor.

oscillation margin

Common

C4

1.0 μF

reference voltage Pop noise is suppressed when C1: C4 = 1:4.

for all input

C5

3900 μF Ripple filter

Power supply ripple filtering

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

3.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 built-in capacitor .

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

engine cranking condition.

4.IC start up procedure

As for this product, to decrease an quiescent current with the stand-by state, the I2C BUS communication

possible condition and the simple condition in case of the turning on exist.

Please confirm of the request the following contents in the limit of the set design.

1) The hardware stand-by state

It doesn't impress the external voltage (5V / 3.3V) and it says the time when the Ripple voltage potential is

large to the ClipDet terminal (4 pins).In case of this condition, it becomes Istby=0.

2) The software stand-by state

When impressing the external voltage (5V / 3.3V) on the ClipDet terminal (4 pins), the internal reference of

VDD amplifier starts-up, it becomes I2C BUS communication will possible condition.

In case of this condition, it becomes Istby=30uA.

3) The IC operation condition

In I2C BUS command (Stby L→H), when sending by the Write command, the charging by the Ripple voltage

(terminal) begins after the switchover to the condition of the above 2).

When the Ripple voltage(terminal) reaches the value of the wish by this, it becomes an IC operation condition.

Therefore, before communicating in I2C BUS, it impresses voltage on the ClipDet terminal once and VDD must

be started.

VDD stands up and after the I2C BUS communication becomes possible, because this terminal functions as the

ClipDet terminal, only in IC start-up, it requests sequence setting to impress potential.

Incidentally, because it touches much more by the separate section about the conduct of the ClipDet terminal, .

*: Add start-up voltage (5.0V / 3.3V) through limitation resistance (10k typ.).

4

2009-02-02

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