Critical Conduction Mode (CrM) Power Factor Correction Controller, Follower Boost

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The NCP1623 is a controller designed to drive PFC boost stages. Based on an innovative Valley Synchronized Frequency Fold-back (VSFF) method, it operates in critical conduction mode (CrM) until the power drops below a threshold level. The PFC controller enters discontinuous conduction mode (DCM) with increased dead-time as the load further decays (frequency foldback). VSFF maximizes the efficiency at both nominal and light loads. In addition, an internal circuitry ensures a near-unity power factor even when the switching frequency is reduced.

Housed in a TSOP-6 package, the circuit also incorporates the features necessary for robust and compact PFC stages, with few external components. The A version provides the follower boost capability for drastic low-line efficiency improvement. This controller is also available in the SOIC-8 package, which features an ultra-low-consumption mode externally controlled by the disable pin.

  • Power Factor Correction
  • Offline Power Supply
  • USB PD Mobile & Laptop Charging
  • Industrial Power Supplies
  • Computing Power Supplies
  • Gaming Power Supplies
  • Critical Conduction Mode (CrM) in heavy load conditions
  • Discontinuous Conduction Mode (DCM) with Frequency Foldback in light load
  • Follower Boost capability (NCP1623A only)
  • Sleep Mode with circuit consumption below 100 µA (SOIC-8 version only)
  • Zero Current Detection via Drain sensing
  • Dynamic Response Enhancer
  • Near unity power factor over the load range

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PFC Mode

Frequency Operation

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NCP1623ASNT1G

Active

Pb

A

H

P

TSOP-6

1

260

REEL

3000

F

CRM

Variable

Current Mode

Step-Up

Variable

30

500 / 800

10.5

Yes

Yes

No

$0.3267

More Details

NCP1623CDR2G

Active

Pb

A

H

P

SOIC-8

1

260

REEL

2500

F

CRM

Variable

Current Mode

Step-Up

Variable

30

500 / 800

10.5

Yes

Yes

No

$0.3912

More Details

NCP1623ADR2G

Active

Pb

A

H

P

SOIC-8

1

260

REEL

2500

F

CRM

Variable

Current Mode

Step-Up

Variable

30

500 / 800

10.5

Yes

Yes

No

$0.3912

More Details

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