MP174A – NON-ISOLATED OFF-LINE REGULATOR

MP174A Rev. 1.0

www.MonolithicPower.com

20

2/27/2019

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FLOW CHART

Power On

Vcc>5.6V

Internal High Voltage

Regulator ON

Y

N

Soft Start

Monitor VFB

Monitor Vcc

OLP= Logic High

Y

OTP, SCP

and open loop

Monitor

Y

Vcc Decrease

to 2.4V

Shut Down

Internal High Voltage

Regulator

N

Continuous

Fault Monitor

Protection

Logic High

Y

N

UVLO, SCP, OLP, OTP and Open loop protections are auto restart

Stop operation

Y

N

Y

VFB<2.55V

VFB<1.7V

Turn ON the

MOSFET

Y

N

6144

switching

counter

finished?

Vcc<3.4V

Y

Y

N

?

VFB<0.5V

Y

N

Open loop

Logic High

Vcc < 5.3V

Internal High Voltage

Regulator ON

Vcc > 5.6V

N

Shut Down

Internal High Voltage

Regulator

Y

N

Figure 12: Control Flow Chart