Totem Pole Continuous Conduction Mode (CCM) / Multi-mode (CrM-CCM) Power Factor Correction Controller

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Overview

The NCP1681 is a PFC controller IC designed to drive the bridgeless totem-pole PFC topology. The bridgeless totem-pole PFC is a power factor correction architecture that consists of a fast switching leg driven at the PWM switching frequency and a second leg that operates at the AC line frequency. This topology eliminates the diode bridge present at the input of a conventional PFC circuit, allowing significant improvement in the power stage efficiency. The controller can be configured to operate in Continuous Conduction Mode (CCM) or Multi-Mode (CrM-CCM) operation.

  • Power Factor Correction
  • Offline Power Supply
  • Server Power
  • Telecom 5G Power
  • Networking Power
  • Gaming Console Power Supplies
  • UHD TV Power Supplies
  • Industrial Power Supplies
  • Totem Pole PFC Topology Eliminates Input Diode Bridge
  • Continuous Conduction Mode (CCM) Operation At High Power Level
  • Optional Multi-mode Operation With CCM at High Power & CrM at Medium Power Level
  • Frequency Foldback in DCM With 25 kHz Minimum Frequency
  • Skip Mode in Very Light Load Condition
  • Novel Current Sense Scheme
  • Digital Voltage Loop Compensation
  • AC Line Monitoring Circuit & AC Phase Detection
  • Near Unity Power Factor in All Operating Modes
  • PFC OK Indicator

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ECAD Models

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Package Type

Case Outline

MSL Type

MSL Temp (°C)

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ON Target

PFC Mode

Frequency Operation

Control Mode

Topology

fSW Typ (kHz)

VCC Max (V)

Drive Cap. (mA)

UVLO (V)

Latch

UVP

Inhibition

Pricing ($/Unit)

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NCP1681ABD2R2G

Active

Pb

A

H

P

SOIC20 NB LESS PIN 17 & 19

1

260

REEL

2500

F

CCM

Fixed

Current/Voltage Mode

Step-Up

95

30

100 / 100

10.5

Yes

Yes

No

$2.6399

More Details

NCP1681BAD2R2G

Active

Pb

A

H

P

SOIC20 NB LESS PIN 17 & 19

1

260

REEL

2500

F

MM

Variable

Current/Voltage Mode

Step-Up

65 / Variable

30

100 / 100

10.5

Yes

Yes

No

$2.6399

More Details

NCP1681AAD2R2G

Active

Pb

A

H

P

SOIC20 NB LESS PIN 17 & 19

1

260

REEL

2500

Y

CCM

Fixed

Current/Voltage Mode

Step-Up

65

30

100 / 100

10.5

Yes

Yes

No

$2.6399

More Details

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