Power Factor Controller (PFC), High Voltage

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Overview

The MC33368 is an active power factor correction controller that functions as a boost preconverter in off-line power supply applications. MC33368 is optimized for low power, high density power supplies requiring a minimum board area, reduced component count and low power dissipation. The narrow body SOIC package provides a small footprint. Integration of the high voltage startup saves approximately 0.7 W of power compared to resistor bootstrapped circuits.

The MC33368 features a watchdog timer to initiate output switching, a one quadrant multiplier to force the line current to follow the instantaneous line voltage a zero current detector to ensure critical conduction operation, a transconductance error amplifier, a current sensing comparator, a 5.0 V reference, an undervoltage lockout (UVLO) circuit which monitors the VCC supply voltage and a CMOS driver for driving MOSFETs. The MC33368 also includes a programmable output switching frequency clamp. Protection features include an output overvoltage comparator to minimize overshoot, a restart delay timer and cycle-by-cycle current limiting.

  • Active Power Factor Control
  • Off-Line Power Supplies
  • Lossless Off-Line Startup
  • Output Overvoltage Comparator
  • Leading Edge Blanking (LEB) for Noise Immunity
  • Watchdog Timer to Initiate Switching
  • Restart Delay Timer

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Product

Status

CAD Models

Compliance

Package Type

Case Outline

MSL Type

MSL Temp (°C)

Container Type

Container Qty.

ON Target

PFC Mode

Frequency Operation

Control Mode

Topology

fSW Typ (kHz)

VCC Max (V)

Drive Cap. (mA)

UVLO (V)

Latch

UVP

Inhibition

Reference Price

MC33368DG

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Last Shipments

CAD Model

Pb

A

H

P

SOIC-16

1

260

TUBE

48

N

CRM

Variable

Current Mode

Step-Up

Variable

16

1000 / 1000

8.5 - 13

Yes

No

Yes

Price N/A

More Details

MC33368DR2G

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Last Shipments

CAD Model

Pb

A

H

P

SOIC-16

1

260

REEL

2500

N

CRM

Variable

Current Mode

Step-Up

Variable

16

1000 / 1000

8.5 - 13

Yes

No

Yes

Price N/A

More Details

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