MP44010 – BOUNDARY MODE PFC CONTROLLER

MP44010 Rev. 1.11

www.MonolithicPower.com

8

10/17/2012

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

© 2012 MPS. All Rights Reserved.

PIN FUNCTIONS

Pin #

Name

Description

1

FB

Feedback pin. The output voltage is fed into this pin through a resistor divider.

2

COMP

Output of the error amplifier. A compensation network is connected between this pin and FB

pin.

3

MULT

Input of the multiplier. Connect this pin to the rectified main voltage via a resistor divider to

provide the sinusoidal reference for the current control loop.

4

CS

Current sense pin. The current through MOSFET is fed into this pin via a resistor. The

resulting voltage on this pin is compared with the output of internal multiplier to get an internal

sinusoidal-shaped reference, to determine MOSFET’s turn-off. On-chip R/C filter can reduce

high frequency noise on this pin.

5

ZCS

Inductor’s zero-crossing current sensing input. A negative-transition edge triggers MOSFET’s

turn-on.

6

GND

Ground.

7

GATE

Gate driver output. The high output current of the gate driver is able to drive low-cost power

MOSFET. The high-level voltage of this pin is clamped to 12V in case this pin is supplied with

a high VCC.

8

VIN

Supply voltage of both the signal path of the IC and the gate driver. A bypass capacitor from

this pin to ground is needed to reduce noise.

BLOCK DIAGRAM

2.5V

+

-

FB

COMP

MULT

CS

+

-

UVLO

Vref

ZCS

GATE

VIN

GND

Multiplier

+

-

Overvoltage

detection

R

SQ

+

-

2.1V

1.35V

Disable

Starter

Driver

Voltage

regulator

150k

2pF

Figure 1—Functional Block Diagram