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NCP1237 Datasheet(PDF) 2 Page - ON Semiconductor

Part # NCP1237
Description  Fixed Frequency Current Mode Controller for Flyback Converters
PDF  34 Pages
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NCP1237 Datasheet(HTML) 2 Page - ON Semiconductor

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



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