TA8208H Просмотр технического описания (PDF) - Toshiba

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производитель

TA8208H

5.8W DUAL AUDIO POWER AMPLIFIER

Toshiba 

TA8208H

3. Measures against oscillation

C7, C8, C9: The capacitor of polyester film having small variation of the temperature characteristics is

recommended as the capacitor for oscillation prevention.

R5: Increases the oscillation allowance at output clippling of the low range frequency (100Hz or less).

Since the oscillation allowance varies according of the following items, carry out the temperature test to confirm

the oscillation allowance.

(1) Gain to be used (GV setting)

(2) Capacity of capacitor

(3) Kinds of capacitor

(4) Layout of printed board

It is recommended to use the capacitor having the capacity exceeding the oscillation stopping value.

At using with the voltage gain GV lowered or with the high range frequency and the oscillation becomes liable to

be produced.

Therefore, application with GV = 40dB or over is advisable.

Especially for using with the gain lowered in dual operation, insert 1000pF between NF (2 pin and 4 pin) and

GND.

This capacitor reduces the gain of the high range frequency and is effective for oscillation prevention.

4. Output waveform at power supply on / off (reference)

Amplifier DC output waveforms in the condition of VCC = 13.2V, RL = 4Ω at non-signal (input short) are shown

in Fig.3.

The popping time at power supply on / off varies according to the rise and fall times.

The condition in which the power supply is rapidly and repeatedly made on / off, that is, the condition in which

the charge is made on the external capacitor of IC is different from the conditions shown is Fig.3.

3

2002-10-30

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