NCP1230

www.onsemi.com

2

Figure 1. Typical Application Example

1

8

2

3

4

7

6

5

CBulk

HV

+

MC33262/33260

OVP

1

8

2

3

4

7

6

5

NCP1230

OVP

+

GN-

D

Rsense

GND

Ramp Comp

10 k

PIN FUNCTION DESCRIPTION

Pin No.

Pin Name

Function

Pin Description

1

This pin provides

the bias voltage to

the PFC controller.

and provides bias to the PFC controller. It goes down in standby and fault conditions.

2

FB

Feedback Signal

An optocoupler collector pulls this pin low to regulate. When the current setpoint

reaches 25% of the maximum peak, the controller skips cycles.

3

CS/OVP

Current Sense

This pin incorporates three different functions: the current sense function, an internal

ramp compensation signal and a 3.0 V latch−off level which latches the output off

4

GND

IC Ground

−

5

DRV

Driver Output

With a drive capability of +500 mA / −800 mA, the NCP1230 can drive large Qg

MOSFETs.

6

The controller accepts voltages up to 18 V and features a UVLO turn−off threshold of

7.7 V typical.

7

NC

−

−

8

HV

High−Voltage

This pin connects to the bulk voltage and offers a lossless startup sequence. The

charging current is high enough to support the bias needs of a PWM controller

through Pin 1.