MP155 – ENERGY EFFICIENT OFF-LINE REGULATOR

MP155 Rev. 1.12

www.MonolithicPower.com

17

10/28/2013

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FLOW CHART

Start

Vcc>5.6V

Internal High Voltage

Regulator ON

Y

N

Soft Start

Monitor Vcc

OLP=Logic High

Y

OTP, SCP

and open loop

Monitor

Y

Vcc Decrease

to 2.4

Shut Down

Internal High Voltage

Regulator

N

Continuous

Fault Monitor

Vcc<5.3V

Y

N

OTP, SCP

or open loop

Logic High?

Y

N

UVLO, OTP, SCP, OLP and Open Loop

Protection are auto restar

Shut off the

Switching

Pulse

Y

N

Y

Turn ON the

MOSFET

Y

N

6144

switching

counter

finished?

Vcc<3.4V

Y

Y

N

Figure 12: Control Flow Chart