SHINDENGEN

ELECTRIC MFG.CO.,LTD

- 5 -

1

Outline

MH2501SC (“master IC” hereinafter) and MH2511SC (“slave IC” hereinafter) comprise ICs for a

current-critical interleaved PFC circuit. Interleaving with master and slave ICs ensures low noise

and high efficiency, which are characteristics of current-critical PFCs, even in high power regions.

One-phase PFC can be configured using just the master IC.

1.1

Features

1.

High efficiency and low noise via master-slave interleaved critical current mode

2.

Two or greater phase interleaving achieved by connecting slave ICs in parallel

3.

One-phase PFC configurable using just the master IC

4.

Support for wide range of input voltages with guaranteed VCC withstand voltage of 26 V

5.

Variety of protective functions

(overvoltage protection, overcurrent protection, feedback open/short protection, and output

diode short protection)

1.2

Block diagram

Fig. 1 Master IC (MH2501SC) block diagram

OUT

IL_OUT

OCL

IL_IN

LATCH

TIMER

VCC

GND

3

2

4

7

6

8

Vcc_UVLO

1

5

Phase

Shifter

IL_IN

EDGE OUT

Master_ON

Timer 50us

Slave_Stop2_F/F

Q

QR

S

Master_ON

Counter_F/F

Q

Q

R

S

Master_ON

Timer_F/F

Q

Q

R

S

ON/OFF_F/F

Q

Q

R

S

Slave_Stop1_F/F

Q

QR

S

Vcc

-

+

+

-

DRIVER

OCL

TIMER

Fig. 2 Slave IC (MH2511SC) block diagram