NCP1237 datasheet(2/34 Pages) ONSEMI

部件名	NCP1237

功能描述	Fixed Frequency Current Mode Controller for Flyback Converters

PDF	34 Pages

Scroll/Zoom	100%

制造商	ONSEMI [ON Semiconductor]

网页	http://www.onsemi.com

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2 / 34 page

NCP1237

http://onsemi.com

Latch

GND

VCC

DRV

Figure 1. Pinout

TYPICAL APPLICATION EXAMPLE

VOUT

VIN

(dc)

NCP1237

LATCH

GND

VCC

DRV

Figure 2. Typical Application

PIN FUNCTION DESCRIPTION

Pin No

Pin Name

Function

Pin Description

LATCH

Latch−off Input

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

Feedback

A pull−down optocoupler controls the output regulation.

Current Sense

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

mean for overpower compensation adjustment.

GND

–

IC ground

DRV

Drive Output

Drives an external MOSFET

VCC

VCC Input

This supply pin accepts up to 28 Vdc

High−Voltage Pin

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

functions of Dynamic Self−Supply and brown−out / line overvoltage

detections

NCP1237 数据表(PDF) 2 Page - ON Semiconductor

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