NCP1238 데이터 시트보기 (PDF) - ON Semiconductor

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NCP1238

Fixed Frequency Current Mode Controller for Flyback Converters

ON Semiconductor 

NCP1238

1 Latch

HV 8

2 FB

3 CS

VCC 6

4 GND

DRV 5

Figure 1. Pinout

TYPICAL APPLICATION EXAMPLE

VIN

(dc)

LATCH

FB

CS

GND

NCP1238

HV

VCC

DRV

VOUT

Figure 2. Typical Application

PIN FUNCTION DESCRIPTION

Pin No Pin Name

Function

1

LATCH

Latch−off Input

2

FB

Feedback

3

CS

Current Sense

4

GND

–

5

DRV

Drive Output

6

VCC

VCC Input

8

HV

High−Voltage Pin

Pin Description

Pull the pin up or down to latch−off the controller. An internal current source allows

the direct connection of an NTC for over temperature detection

A pull−down optocoupler controls the output regulation.

Senses the primary current for current−mode operation, and provides a mean for

overpower compensation adjustment.

IC ground

Drives an external MOSFET

This supply pin accepts up to 28 Vdc

Connects to the bulk capacitor or the rectified AC line to perform the functions of

Dynamic Self−Supply and brown−out / line overvoltage detections

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