TA8215HQ Ver la hoja de datos (PDF) - Toshiba

Número de pieza

componentes Descripción

Fabricante

TA8215HQ

18W BTL ×2CH Audio Power Amplifier

Toshiba 

TA8215HQ/LQ

5. Muting function

Through setting pin (1) (mute terminal) at about 1V or less, muting becomes possible.

The interval circuit of IC is shown in Fig.4.

When pin (1) is set to low, Q1 and Q2 are turned on, the charge of the ripple condenser is discharged and the bias

is cut. The mute amount of 60dB or over can be obtained.

Since this muting function rapidly discharges the charge of the ripple filter capacitor of pin (8), the pop noise is

generated by the DC fluctuation of the bias section.

Therefore, this muting function is not appropriate to the audio muting but is effective in muting at VCC→on.

6. External part list and description

Symbol

Recommended

Value

Feature

C1

4.7µF

DC

blocking

C2

47µF

Feedback

condenser

Influence

Smaller Than

Recommended Value

Larger Than

Recommended Value

Related to pop noise at VCC→on.

Related to pop noise at VCC→on.

Determination of low cut−off frequency.

C2 =

1

2πfL・Rf

Remarks

Related to gain.

Refer to item 4.

―

C3

220µF

Ripple

reduction

Time constant is small

at VCC→on or off.

Time constant is large

at VCC→on or off.

―

C4

0.12µF

Oscillation

prevention

Made liable to

oscillate.

Oscillation allowance

improved.

Refer to item 3.

C5

1000µF

Ripple

filter

For filtering power supply hum and ripple.

Large at using AC rectified power supply.

Small at using DC power supply.

―

5

2006-04-28

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