MP44010 – BOUNDARY MODE PFC CONTROLLER

MP44010 Rev. 1.11

www.MonolithicPower.com

12

10/17/2012

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Case 2:

At light load, the power loss can be saved by

inserting LN60A01 to disconnect the resistor of

voltage divider. The implement circuit is shown in

the Figure 7.

At light load, the pin 9 of HR1000 is asserted low

when it operates at burst mode, and the signal

generated from pin 9 is applied to synchronize

the ON/OFF of MP44010; it also can drive

LN60A1 to connect or disconnect resistor of

voltage divider at the same time. And the control

signal of LN60A01 also can be external signal

from MCU system. For more details, please refer

to AN of MP44010.

VCC

MP44010

HR1000

AC

input

GND

Vbus

LN60A01

Control Signal

7

7

3

1

5

1

8

5

6

7

4

3

1

2

9

Figure 7—Power Consumption Reduction with LN60A01