NCP1234 View Datasheet(PDF) - ON Semiconductor
Part Name
Description
Manufacturer
NCP1234 Datasheet PDF : 33 Pages
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NCP1234
TYPICAL APPLICATION EXAMPLE
VIN
(dc)
LATCH
FB
CS
GND
NCP1234
HV
VCC
DRV
VOUT
Figure 1. Flyback Converter Application Using the NCP1234
PIN FUNCTION DESCRIPTION
Pin No Pin Name
Function
1
LATCH
Latch−Off Input
2
FB
3
CS
Feedback
Current Sense
4
GND
5
DRV
6
VCC
Drive output
VCC input
8
HV
High−voltage pin
Pin Description
Pull the pin up or down to latch−off the controller. An internal current source
allows the direct connection of an NTC for over temperature detection
An optocoupler collector to ground controls the output regulation.
This Input senses the Primary Current for current−mode operation, and Offers
an overpower compensation adjustment.
IC Ground
Drives external MOSFET
This supply pin accepts up to 28 Vdc, with overvoltage detection
Connects to the bulk capacitor or the rectified AC line to perform the functions
of Start−up Current Source and Dynamic Self−Supply
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