MSC1157 Ver la hoja de datos (PDF) - Oki Electric Industry

Número de pieza

componentes Descripción

Lista de partido

MSC1157

Speaker Drive Amplifier

Oki Electric Industry 

¡ Semiconductor

APPLICATION CIRCUIT

MSC1157

+

C4

C3

–

Standby

Select

Input

Standby

Input

Audio

Input

SEL

VCC

SP

STBY

C1

AIN

VR

GND

SP

+

C2

–

Speaker

• If parasitic capacitance of 60pF or more exists between GND and the speaker output pin SP or

SP, oscillation may occur. Implement the circuit mount design so as to be less than 60pF.

• C1 is the AC coupling capacitor. Cutoff frequency fc on the low frequency side is determined

by the following equation. Choose a value of C1 according to the bandwidth.

1

fc =

2 ¥ p ¥ C1 ¥ 20k

(Hz)

• Choose a value of C2 that is 80 to 100 times as large as that of C1.

• When the standby function is not used, connect the pins STBY and SEL to VCC or GND.

• It is recommended that the capacitor C4 (approximately 0.1mF) having better high frequency

characteristics and the capacitor C3 (approximately 10mF) be placed between the pins VCC and

GND.

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