UTCTA7368P Просмотр технического описания (PDF) - Unisonic Technologies

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UTCTA7368P

0.6W AUDIO POWER AMPLIFIER

Unisonic Technologies 

UTCTA7368P LINEAR INTEGRATED CIRCUIT

Pin 9

Q2

Q3 R5

Pin 1 Q1

R1

27¦¸

Pin 5

Pin 7

R4

Q4

Pin 3

D1

Figure 1

1

R4

3

Rf

R5

Figure 2

2

Crip

Figure 3

3. Ripple rejection (Figure 3)

Adding Crip, to the ripple terminal 2 as shown in Figure 3, the ripple rejection ratio is improved from -25dB to -45dB.

4. Power dissipation

Casre should be taken to use IC below maximum power dissipation because it may be over maximum rating

depending on operating condition.

Pd=900mW (Ta=25°C)

5. Phase-compensation

Small temperature coefficient and excellent frequency characteristics is needed by capacitor below:

*Oscillation preventing capacitor for power amplifier output

*Bypass capacitor for ripple filter

*Capacitor between Vcc and GND

TEST CIRCUIT

Vcc

Input

2

9

Ripple

Rejection

1

470 µF Output

7

10kΩ

RL

3

Negative

Feedback

4

56

Phase

Pre

GND

Power

GND

UTC UNISONIC TECHNOLOGIES CO., LTD. 3

QW-R107-009,A

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