TA8207K 데이터 시트보기 (PDF) - Unisonic Technologies

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TA8207K

LOW FREQUENCY POWER AMPLIFIER

Unisonic Technologies 

TA8207K

LINEAR INTEGRATED CIRCUIT

 APPLICATION INFORMATION

1. ADJUSTMENT OF VOLTAGE GAIN

The voltage gain GV is obtained as follows by R1, R2 and RF in Fig.1.

INPUT

6/7

RF 5/8

R1

45Ω

+

AMP

-

R2

30kΩ

OUTPUT

2/10

RF+R1+R2

GV=20λog

RF+R1

When RF=0Ω

GV=56.5dB(typ.)

When RF=120Ω

GV=45dB(typ.)

Reduction of GV is possible by increasing RF. However, it is recommended to use this at 40dB or over since the

feedback increase is liable to produce oscillation.

2. THERMAL SHUTDOWN CIRCUIT

The built-in thermal shut-down circuit can prevent the destruction of IC that abnormal temperature rise when the

heat radiation is insufficient. The operation temperature is set at radiation fin temperature 175℃, at this temperature

or over the bias is interrupted to prevent the destruction of IC.

3. INPUT STAGE

Below circuit shows the input circuit of this IC.

Q2

INPUT

-+

6/7

Q1

CIN

9

GND

OUTPUT

Q3

30KΩ

2/10

to DRIVER

NF 5/8

to BIAS

It is possible that without input coupling capacitor in the input circuit by use a PNP Transistor, Q1. However, 60mV

max offset voltage is produced at pin (6) and (7). Application after checking volume slide noise is recommended. In

order to cut the volume slide noise, insert the input capacitor (CIN) in series to interrupt the DC component.

UNISONIC TECHNOLOGIES CO., LTD

www.unisonic.com.tw

5 of 10

QW-R107-013.E

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