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NCP1230_08

Low-Standby Power High Performance PWM Controller

ON Semiconductor 

NCP1230

OPERATING DESCRIPTION

Introduction

The NCP1230 is a current mode controller which provides

a high level of integration by providing all the required

control logic, protection, and a PWM Drive Output into a

single chip which is ideal for low cost, medium to high

power off-line application, such as notebook adapters,

battery chargers, set-boxes, TV, and computer monitors.

The NCP1230 can be connected directly to a high voltage

source providing lossless startup, and eliminating external

startup circuitry. In addition, the NCP1230 has a PFC_VCC

output pin which provides the bias supply power for a Power

Factor Correction controller, or other logic. The NCP1230

has an event management scheme which disables the

PFC_VCC output during standby, and overload conditions.

PFC_VCC

As shown on the internal NCP1230 diagram, an internal

low impedance switch SW1 routes Pin 6 (VCC) to Pin 1

when the power supply is operating under nominal load

conditions. The PFC_VCC signal is capable of delivering up

to 35 mA of continuous current for a PFC Controller, or

other logic.

Connecting the NCP1230 PFC_VCC output to a PFC

Controller chip is very straight forward, refer to the “Typical

Application Example” all that is generally required is a

small decoupling capacitor (0.1 mF).

High Voltage

1

8

2

7

3

6

4

5

MC33262/33260

PFC_VCC

1

8

2

7

3

6

4

5

NCP1230

+

Vout

GND

VCC Cap

Figure 29. Typical Application Example

Rsense

GND

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