NCP1379 ON Semiconductor, NCP1379 Datasheet - Page 2

• Manufacturer Part Number: NCP1379
• Description: Quasi-Resonant Current-Mode Controller
• Manufacturer: ON Semiconductor

PIN FUNCTION DESCRIPTION
Pin N5
1
2
3
4
5
6
7
8
Pin Name
GND
Fault
ZCD
DRV
V
FB
CS
C
CC
T
ZCD / OPP
Adjust the over power protection
Zero Crossing Detection
Overvoltage protection
Supplies the controller
1
2
3
4
Timing capacitor
HV −bulk
Current sense
Feedback pin
NCP 1 3 7 9
Driver output
Brown−out
Function
Figure 1. Typical Application Schematic
TYPICAL APPLICATION EXAMPLE
−
8
7
6
5
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Connected to the auxiliary winding, this pin detects the core reset
event.
Also, injecting a negative voltage smaller than 0.3 V on this pin will
perform over power protection.
Hooking an optocoupler collector to this pin will allow regulation.
This pin monitors the primary peak.
The controller ground
The driver’s output to an external MOSFET
This pin is connected to an external auxiliary voltage.
This pin observes the HV rail and protects the circuit in case of low
main conditions. It also offers a way to latch the circuit in case of over
voltage event.
A capacitor connected to this pin acts as the timing capacitor in fold-
back mode.
2
VCC
.
.
Pin Description
.
GND
GND
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Vout