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NCP1212

Current Mode PWM

Controller for Both Forward

and Flyback Converters

NCP1212 is a high performance current mode PWM controller

specifically designed for off鈭抣ine and DC鈭抰o鈭扗C converter

applications. The device requires very few external components and

offers designer additional protection for better system reliability. The

device features a trimmed oscillator for precise Duty Cycle control,

accurate bandgap voltage reference, high gain error amplifier, current

sensing comparator and a high current totem pole output gate driver

that ideally drives the external power MOSFET. Additionally, the

device has built鈭抜n programmable Brownout Detect and Soft鈭扴tart

features to enhance system reliability. Also, the 48%/82% selectable

maximum turn on Duty Cycle control and external programmable

switching frequency capabilities make this device an ideal controller

for both forward and flyback configurations. This device is available

in both PDIP鈭? and space saving SOIC鈭? packages.

Features

http://onsemi.com

MARKING

DIAGRAMS

8

1

SOIC鈭?

D SUFFIX

CASE 751

1

8

PDIP鈭?

P SUFFIX

CASE 626

1

NCP1212

AWL

YYWW

N1212

ALYW

8

鈥?/div>

Pb鈭扚ree Package is Available

鈥?/div>

Trimmed Oscillator Charge and Discharge Current for Precise Duty

鈥?/div>

Cycle Control

Internal High Accuracy Bandgap Voltage Reference

Current Mode Operation up to 200 kHz

Inherent Feed Forward Compensation

Latching PWM for Cycle鈭抌y鈭扖ycle Current Limiting

High Current Totem Pole Output Gate Driver

Low Startup and Operating Current

Internal Undervoltage Lockout with Hysteresis

Internal Leading Edge Blanking for Current Feedback

Direct Interface with Optocoupler for Secondary Sensing

Built鈭抜n Soft鈭扴tart Function, Programmable by External Capacitor

User Programmable 48%/82% Maximum Duty Cycle Selection

Output Overvoltage Protection Against Open Loop

AC Line Brownout Detect Protection

Output Overload Protection Irrespective of Auxiliary Voltage Level

A

WL, L

YY, Y

WW, W

= Assembly Location

= Wafer Lot

= Year

= Work Week

PIN CONNECTIONS

FB

BOK

CS

CT

1

2

3

4

(Top View)

8

7

6

5

SS/DMAX

VCC

DRV

GND

ORDERING INFORMATION

Device

NCP1212DR2

NCP1212P

NCP1212PG

Package

SOIC鈭?

PDIP鈭?

(Pb鈭扚ree)

Shipping

鈥?/div>

2500 Tape & Reel

50 Units/Rail

Typical Applications

ATX PC Power Supply

Universal Input Wall Mount Adaptors

CRT Monitor

All Flyback and Forward SMPS Systems

鈥燜or information on tape and reel specifications,

including part orientation and tape sizes, please

refer to our Tape and Reel Packaging Specifications

Brochure, BRD8011/D.

漏

Semiconductor Components Industries, LLC, 2004

1

October, 2004 鈭?Rev. 2

Publication Order Number:

NCP1212/D

型號(hào)

版本

描述

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