TA7280 Ver la hoja de datos (PDF) - Toshiba

Número de pieza

componentes Descripción

Fabricante

TA7280

5.8W Dual Audio Power Amplifier. 22W BTL Audio Power Amplifier.

Toshiba 

TA7280,81P

3. Measures against oscillation.

C7, C8, C9, C12: The capacitor of polyester film having small variation of the temperature characteristics is

recommended as the capacitor for oscillation prevention.

C12: Reduces the gain in the high range frequency (150kHz or over) and increases the oscillation allowance.

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

Since the oscillation allowance varies according to the following item, 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 oscilltation 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 (pin(2) and pin(4)) 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)

BTL and dual amplifier DC output waveforms in the condition of VCC = 13.2V, RL = 4Ω at non-signal (input

short) are shown in (Fig. 5) and (Fig. 6).

DUAL

4

2002-10-30

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