NCP1028P065G datasheet(2/29 Pages) ONSEMI

Part #	NCP1028P065G

Description	High-Voltage Switcher for Medium Power Offline SMPS Featuring Low Standby Power

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Manufacturer	ONSEMI [ON Semiconductor]

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NCP1028

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2

85−265 VAC

+

BO

+

1

2

3

4

5

7

8

NCP1028

OPP*

+

Vout

GND

Figure 1. Typical Application

Ramp

Comp.*

*Optional component

PIN FUNCTION DESCRIPTION

Pin No.

Symbol

Function

Description

1

VCC

Powers the Internal

Circuitry

This pin is connected to an external capacitor of typically 22

mF.

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 VCC.

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

Drain

Drain Connection

The internal drain power switch circuit connection.

−

This unconnected pin ensures adequate creepage distance.

7

OPP

Over Power Protection

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

−

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NCP1028P065G Datasheet(PDF) 2 Page - ON Semiconductor

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