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MC33260P

GreenLine™ Compact Power Factor Controller: Innovative Circuit for Cost Effective Solutions

ON Semiconductor 

MC33260

PIN FUNCTION DESCRIPTION

Pin #

PDIP−8

Pin #

SO−8

Function

Description

1

7

Feedback Input This pin is designed to receive a current that is proportional to the preconverter output

voltage. This information is used for both the regulation and the overvoltage and

undervoltage protections. The current drawn by this pin is internally squared to be used

as oscillator capacitor charge current.

2

8

Vcontrol

This pin makes available the regulation block output. The capacitor connected between

this pin and ground, adjusts the control bandwidth. It is typically set below 20 Hz to

obtain a nondistorted input current.

3

1

Oscillator Capacitor The circuit uses an on−time control mode. This on−time is controlled by comparing the

(CT)

CT voltage to the Vcontrol voltage. CT is charged by the squared feedback current.

4

2

Zero Current

This pin is designed to receive a negative voltage signal proportional to the current

Detection Input flowing through the inductor. This information is generally built using a sense resistor.

The Zero Current Detection prevents any restart as long as the Pin 4 voltage is below

(−60 mV). This pin is also used to perform the peak current limitation. The overcurrent

threshold is programmed by the resistor connected between the pin and the external

current sense resistor.

5

3

Synchronization This pin is designed to receive a synchronization signal. For instance, it enables to

Input

synchronize the PFC preconverter to the associated SMPS. If not used, this pin must

be grounded.

6

4

Ground

This pin must be connected to the preregulator ground.

7

5

Gate Drive

The gate drive current capability is suited to drive an IGBT or a power MOSFET.

8

6

VCC

This pin is the positive supply of the IC. The circuit turns on when VCC becomes higher

than 11 V, the operating range after startup being 8.5 V up to 16 V.

D1...D4

Filtering

Capacitor

1

2

Vcontrol

3

ROCP

Rcs

4

CT

VCC

8

7

6

5

Sync

L1

D1

+ C1

M1

Load

(SMPS, Lamp

Ballast,...)

Ro

DIP−8 CONFIGURATION SHOWN

Figure 21. Application Schematic

http://onsemi.com

8

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