NJM2770 Просмотр технического описания (PDF) - Japan Radio Corporation

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NJM2770

HIGH-POWER & LOW-VOLTAGE AUDIO POWER AMPLIFIER

Japan Radio Corporation  

s APPLICATION CURCUIT

Rf 20kΩ

V+=+3V

10µF

6

Ci Ri

INPUT

4

0.1µF 20kΩ

3

C1

1.0µF

C2

2

4.7µF

50kΩ

145kΩ

50kΩ

BIAS

1

#A

5

#B

8

TSD

7

NJM2770

CD(POWER DOWN)

SPEAKER

8Ω/16Ω

note:1.The CD terminal(1pin) should connect High level(>2.0V), when NJM2770 is active.

The standby mode, when the CD terminal is Low level(<0.8V).

2.To add the C1 and C2 capacitor, the power-supply-rejection-ratio will be improved.

When C1 is large vaiue, C2 will be unnecessary.

3.The power-up time depend on the C1 and C2 capacitor.

4.The input current of CD terminal is as shown below figure.

V+

72kΩ

1pin

80kΩ

GND

5.No connect oscillation-protect RC required.

To connect oscillation-protect RC, if the NJM2770 oscillate with PC board/stray capacitor/long speaker wire

and others condition.

-3 -

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