MP44019

– CRM/DCM MULTI-MODE PFC CONTROLLER WITH SECOND OVP

MP44019 Rev. 1.0

MonolithicPower.com

26

4/30/2021

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© 2021 MPS. All Rights Reserved.

CONTROL FLOWCHART

VCC > VCC_ON

Start

N

Y

Monitor

VMAINSIN

VMAINSIN >

VMAINS_BI

Brown-In

Y

N

Main On

Figure 16: Start-Up Flowchart

Main On

Monitor VFB

VFB > 2.7V

Resume Switching

Stop

Switching

VFB < 2.62V

N

Y

Y

N

OVP/OVP2

Monitor VFB

UVP

VFB < 0.36V

N

Y

Stop

Switching

OTP

Monitor Temp

>150°C?

N

Y

Stop

Switching

Fault = 1

<110°C?

FAULT = 1

N

Start

Switching

FAULT = 0

Y

VFB > 0.4V

Y

N

Start

Switching

Fault = 0

Monitor VCS

VCS > 0.75V

Resume Switching

after 80ms

Stop

Switching

N

Y

OCP

Consecutive

Counter = 3

Clear

Counter

Y

Monitor VCS

VCS > 0.5V

Resume switching

after ZCD, or restart

the timer after

180µs elapses

Stop

Switching

N

Y

OCL

Y

Monitor

VMAINSIN

BO

VMAINSIN <

0.9V

N

Y

Stop

Switching

FAULT = 1

COMP = 0

BO Timer Start

BO Timer =

50ms

Y

N

VMAINSIN > 1V

Y

BO Timer = 0

Y

BIBO = 0

FAULT = 0

BIBO = 1

BI

Start

COMP = 0

Figure: 17: Control Flowchart