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NCP1027
V out
+
OPP*
NCP1027
OVP
1
8
85-265 VAC
+
BO
2
3
7
+
+
4
5
GND
Ramp
Comp.*
*Optional component
Figure 1. Typical Application
PIN FUNCTION DESCRIPTION
Pin No.
1
Symbol
V CC
Function
Powers the Internal
Circuitry
Description
This pin is connected to an external capacitor of typically 22 m F. The V CC
includes an active shunt which serves as an auto-recovery overvoltage
protection.
2
Ramp Comp.
Ramp Compensation
in CCM
To extend the duty cycle operation in Continuous Conduction Mode (CCM),
pin 3 offers the ability to inject ramp compensation in the controller. If unused,
short this pin to V CC .
3
Brown-Out
Brown-Out and
Latchoff Input
By monitoring the bulk level via a resistive network, the circuit protects itself
from low mains conditions. If an external event brings this pin above 4.0 V,
the part fully latches off.
4
FB
Feedback Signal Input
By connecting an optocoupler to this pin, the peak current setpoint is adjusted
accordingly to the output power demand.
5
-
7
Drain
-
OPP
Drain Connection
-
Over Power Protection
The internal drain power switch circuit connection.
This unconnected pin ensures adequate creepage distance.
Driving this pin reduces the power supply capability in high line conditions. If
no Over Power Protection is needed, short this pin to ground.
8
GND
The IC Ground
-
http://onsemi.com
2
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