MP44011 – BOUNDARY-MODE PFC CONTROLLER WITH HARMONIC INJECTION

MP44011 Rev. 1.01

www.MonolithicPower.com

8

1/12/2012

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PIN FUNCTIONS

Pin #

Name

Description

1

FB

Feedback. Connect to the output voltage through a resistor divider.

2

COMP

Error Amplifier Output. Connect a compensation network between this pin and the FB pin.

3

MULT

Multiplier Input. Connect to the rectified main voltage through a resistor divider to provide the

sinusoidal reference for the current control loop. Also senses input AC voltage and injects

constant ratio harmonics

4

CS

Current Sense. Senses the current through the MOSFET using a resistor. Provides internal

sinusoidal reference when compared with the output of the internal multiplier to determine

MOSFET’s turn-off. On-chip R/C filter reduces high-frequency noise on this pin.

5

ZCS

Current-Zero–Crossing Sense. A negative going-edge triggers the MOSFET to turn on.

6

GND

Ground.

7

GATE

Gate Driver Output. The large gate-driver current can drive the gate of the low-cost high-

power MOSFET in the system. The pin voltage is clamped to 15V in case this pin is supplied

with a high VCC.

8

VIN

Supply Voltage. Powers both the signal block and gate driver. Use a bypass capacitor from

this pin to ground to reduce the noise.

BLOCK DIAGRAM

2.5V

+

-

FB

COMP

MULT

CS

+

-

UVLO

Vref

ZCS

GATE

VIN

GND

Multiplier

+-

Overvoltage

detection

R

S Q

+

-

2.1V

1.35V

Disable

Starter

Driver

Voltage

regulator

150k

1.4pF

Harmonic injection

generation

Figure 1: Functional Block Diagram