参数资料
型号: LB1836M
厂商: SANYO SEMICONDUCTOR CO LTD
元件分类: 模拟信号调理
英文描述: SPECIALTY ANALOG CIRCUIT, PDSO14
封装: MFP14S
文件页数: 4/6页
文件大小: 81K
代理商: LB1836M
LB1836M
No.3947-4/6
Design Notes
If large current flows on the power supply (VS) line and the GND line, then in some applications and layouts,
misoperation due to line oscillation may result.
The modes during which large current flows are as follows :
Motor surge current when the DC motor starts up or when it shifts rotation directions (forward reverse).
Passthrough current generated within the IC when shifting rotation directions (forward reverse) or when shifting
from forward/reverse rotation to braking, or vice versa.
The following points should be kept in mind regarding the pattern layout :
Keep the wiring lines thick and short in order to reduce wiring inductance between the power supply (VS) and GND.
Insert a passthrough capacitor near the IC. (Maximum effect is obtained by inserting the passthrough capacitor
between VS and the pin 7 GND at the closest distance possible.
If the CPU and the LB1836M are mounted on separate boards and the difference between the ground potential of each
board is large, install resistors of about 10k
in series between the CPU and the LB1836M inputs.
Vcont pin
ID =
VZ
r
(= constant)
As shown in the above diagram, the Vcont pin outputs the voltage of the band gap Zener VZ + VF (=1.93V).
In normal use, this pin is left open.
The drive current ID is varied by the Vcont voltage. However, because the band gap Zener is shared, it functions as a
bridge.
M
OUT
300
OUT
ID
IN
VCC
Vcont
VZ
VS
相关PDF资料
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LB1837M SPECIALTY ANALOG CIRCUIT, PDSO14
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