NCP1237 ONSEMI [ON Semiconductor], NCP1237 Datasheet - Page 2

• Manufacturer Part Number: NCP1237
• Description: Fixed Frequency Current Mode Controller for Flyback Converters
• Manufacturer: ONSEMI [ON Semiconductor]

PIN FUNCTION DESCRIPTION
Pin No
(dc)
VIN
1
2
3
4
5
6
8
Pin Name
LATCH
GND
DRV
V
CS
HV
FB
CC
LATCH
GND
CS
FB
High−Voltage Pin
Latch−off Input
Current Sense
Drive Output
Feedback
V
Function
CC
NCP1237
–
TYPICAL APPLICATION EXAMPLE
Input
Figure 2. Typical Application
1
2
3
4
HV
VCC
DRV
GND
Latch
FB
CS
http://onsemi.com
Figure 1. Pinout
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
A pull−down optocoupler controls the output regulation.
Senses the primary current for current−mode operation, and provides a
mean for overpower compensation adjustment.
IC ground
Drives an external MOSFET
This supply pin accepts up to 28 Vdc
Connects to the bulk capacitor or the rectified AC line to perform the
functions of Dynamic Self−Supply and brown−out / line overvoltage
detections
2
VCC
DRV
HV
5
8
6
Pin Description
VOUT