LX1681CDM データシートの表示（PDF） - Microsemi Corporation
部品番号
コンポーネント説明
メーカー
LX1681CDM Datasheet PDF : 9 Pages
| |||
PRODUCT DATABOOK 1996/1997
LX1681/1682
VOLTAGE-MODE PWM CONTROLLERS
PRODUCTION DATA SHEET
Pin
Name
VFB
SS
GND
TDRV
BDRV
VC1
CS
VCC
FUNCTIONAL PIN DESCRIPTION
Description
Voltage feedback — 1.25V reference is connected to a resistor divider to set desired
output voltage.
Soft-start and hiccup capacitor pin. During start up the voltage of this pin controls the
output voltage. An internal 20kΩ resistor and the external capacitor set the time constant
for soft-startup. Soft-start does not begin until the supply voltage exceeds the UVLO
threshold. When over-current occurs, this capacitor is used for timing hiccup.
The PWM can be disabled by pulling the SS pin below 0.3V.
Ground for IC
Gate drive for upper MOSFET
Gate drive for lower MOSFET
Separate supply for MOSFET gate drive. Connect to 12V
Over-current set. Connect resistor between CS pin and the source of the upper MOSFET to
set current-limit point.
IC supply voltage (nominal 5V) and high side drain sense voltage.
Pin Number
LX1681 LX1682
1
1
2
2
4
3
5
4
5
6
6
7
7
8
8
4
Copyright © 1999
Rev. 1.0 5/99
Share Link: 