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NCP1240G Datasheet(PDF) 2 Page - ON Semiconductor

Part # NCP1240G
Description  Fixed Frequency Current Mode Controller for Flyback Converters
Download  44 Pages
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NCP1240G Datasheet(HTML) 2 Page - ON Semiconductor

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NCP1240G
www.onsemi.com
2
TYPICAL APPLICATION EXAMPLE
Figure 1. Flyback Converter Application Using the NCP1240G
GND
GND
GND
GND
NCP1240
GND
GND
PC817
GND
GND
GND
GND
NCP431
GND
GND
GND
L2
L1
Q1
D1
COUT
LATCH
1
FB
2
CS
3
GND
4
DRV 5
VCC 6
HV 8
IC1
TR
2
1
4
3
6
5
D3
C1
ROPP
D8
NTC
OK1
1
2
3
4
C2
IC2
C3
D9
D10
RHV
CX1
CX2
12
34
12
34
C4
ac input
dc output
OPTIONS
Part
Option
Frequency
OCP Fault
NCP1240
G
65 kHz
Latched
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 + Shutdown pin
An optocoupler collector to ground controls the output regulation. The part
goes to the low consumption Off mode if the FB input pin is pulled to GND.
3
CS
Current Sense
This Input senses the Primary Current for current−mode operation, and
offers an overpower compensation adjustment.
4
GND
−
The controller ground
5
DRV
Drive output
Drives external MOSFET
6
VCC
VCC input
This supply pin accepts up to 28 Vdc, with overvoltage detection. The pin is
connected to an external auxiliary voltage. It is not allowed to connect
another circuit to this pin to keep low input power consumption.
8
HV
High−voltage pin
Connects to the rectified AC line to perform the functions of Start−up
Current Source, Self−Supply, brown−out detection and X2 capacitor
discharge function and the HV sensing for the overpower protection
purposes. It is not allowed to connect this pin to DC voltage.


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