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参数资料
| 型号： | MSC1157 |
| 厂商： | OKI SEMICONDUCTOR CO., LTD. |
| 英文描述： | Speaker Drive Amplifier |
| 中文描述： | 扬声器驱动放大器 |
| 文件页数： | 5/14页 |
| 文件大小： | 143K |
| 代理商： | MSC1157 |
Semiconductor
MSC1157
5/13
APPLICATION CIRCUIT
SEL
V
CC
STBY
A
IN
VR
SP
SP
+
–
Standby
Select
Input
Standby
Input
Audio
Input
+
–
C4
C3
Speaker
C2
C1
GND
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.
fc =
2
￥ p ￥
C1
￥
20k
1
(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 V
CC
or GND.
It is recommended that the capacitor C4 (approximately 0.1
m
F) having better high frequency
characteristics and the capacitor C3 (approximately 10
m
F) be placed between the pins V
CC
and
GND.
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