MP44014 – BOUNDARY MODE PFC CONTROLLER

MP44014 Rev. 1.01

www.MonolithicPower.com

8

11/10/2015

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PIN FUNCTIONS

Pin #

Name

Description

1

FB

Feedback.

The output voltage is fed into FB through a resistor divider.

2

COMP

Output of the error amplifier.

A compensation network is connected between COMP and

FB.

3

MULT

Input of the multiplier.

Connect MULT to the rectified main voltage via a resistor divider to

provide the sinusoidal reference for the current control loop.

4

CS

Current sense.

The current through the MOSFET is fed into CS via a resistor. The resulting

voltage on CS is compared with the output of the internal multiplier to get an internal

sinusoidal-shaped reference to determine the MOSFET’s turn-off. The on-chip R/C filter can

reduce high frequency noise on CS. Also, suggest to add a RC filter on the CS pin in case of

switching noise is too large.

5

ZCS

Inductor’s zero-crossing current sensing input

. A negative transition edge triggers the

MOSFET’s turn-on. Suggest to connect a 22pF cap from this ZCS to GND to tune ZVS point.

6

GND

Ground.

7

GATE

Gate driver output.

The high output current of the gate driver is able to drive a low-cost

power MOSFET. The high-level voltage of GATE is clamped to 12V in case GATE is supplied

with a high VCC.

8

VCC

Supply voltage for both the signal path of the IC and the gate driver.

A bypass capacitor

from VCC to ground is needed to reduce noise.