PWM Controller, High Performance, Active Clamp / Reset

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Overview

The NCP1562x is a family of voltage mode controllers designed for dc-dc converters requiring high efficiency and low parts count. These controllers incorporate 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 NCP1562 family 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 NCP1562 are soft-stop and a cycle skip current limit with a time threshold. Softstop circuitry powers down the converter in a controlled manner if a severe fault is detected. The cycle skip detector enables a softstop sequence if a continuous overcurrent condition is present. Additional features found in the NCP1562 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.

  • High power isolated DC/DC converters
  • Power supplies
  • Desktop / Server PSU
  • Telecom base station PSU
  • Flat TV PSU
  • 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 100 V Startup Circuit
  • Precision 5 V Reference

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NCP1562BDR2G

Active

Pb

A

H

P

SOIC-16

1

260

REEL

2500

N

Forward

1

Voltage Mode

8

100

1000

$1.056

More Details

NCP1562ADBR2G

Active

Pb

A

H

P

TSSOP-16

1

260

REEL

2500

N

Forward

1

Voltage Mode

8

100

1000

$1.2206

More Details

NCP1562BDBR2G

Last Shipments

Pb

A

H

P

TSSOP-16

1

260

REEL

2500

N

Forward

1

Voltage Mode

8

100

1000

Price N/A

More Details

NCP1562ADR2G

Active

Pb

A

H

P

SOIC-16

1

260

REEL

2500

N

Forward

1

Voltage Mode

8

100

1000

$1.1616

More Details

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