Controllers | NCP1282

High-Performance Active Clamp/Reset PWM Controller Featuring HV Start-up

Obsolete

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Overview

The NCP1282 is a voltage mode controller designed for ac-dc or dc-dc converters requiring high efficiency and low parts count. This controller incorporates two in phase outputs with an overlap delay to prevent simultaneous conduction and facilitates soft switching. The main output is designed for driving a forward converter primary MOSFET. The secondary output is designed for driving an active clamp circuit MOSFET, a synchronous rectifier on the secondary side, or an asymmetric half bridge circuit. The NCP1282 reduces component count and system size by incorporating high accuracy on critical specifications such as maximum duty cycle limit, undervoltage detector and overcurrent threshold. Two distinctive features of the NCP1282 are soft-stop and a cycle skip current limit with a time threshold. Soft-stop circuitry powers down the converter in a controlled manner if a severe fault is detected. The cycle skip detector enables a soft-stop sequence if a continuous overcurrent condition is present. Additional features found in the NCP1282 include line feedforward, frequency synchronization up to 1.0 MHz, cycle by cycle current limit with leading edge blanking (LEB), independent under and overvoltage detectors, adjustable output overlap delay, programmable maximum duty cycle, internal startup circuit and soft-start.

  • Desktop / Server PSU
  • Telecom base station PSU
  • Flat TVs PSU
  • High power isolated dc-dc converters

  • Dual Outputs with Adjustable Overlap Delay
  • >2 A Output Drive Capability
  • Soft-Stop Powers Down Converter in a Controlled Manner
  • Cycle-by-Cycle Current Limit
  • Cycle Skip Initiated if Continuous Current Limit Condition Exists
  • Voltage Mode Operation with Input Voltage Feedforward
  • Fixed Frequency Operation up to 1 MHz
  • Bidirectional Frequency Synchronization
  • Independent Line Undervoltage and Overvoltage Detectors
  • Accurate Programmable Maximum Duty Cycle
  • Programmable Maximum Volt-Second Product
  • Programmable Soft-Start
  • Internal 500 V Startup Circuit
  • Precision 5 V Reference

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NCP1282BDR2G

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Obsolete

CAD Model

Pb

A

H

P

SOIC-16

751B-05

3

260

REEL

2500

N

-

1

Voltage Mode

8

20

Up to 500

Price N/A

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