MP171 –NON-ISOLATED OFFLINE REGULATOR

MP171 Rev. 1.0

www.MonolithicPower.com

17

9/30/2015

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

© 2015 MPS. All Rights Reserved.

FLOW CHART

UVLO, SCP, OLP, OTP and Open-Loop Protections are Auto Restart

Power On

Internal High Voltage

Regulator On

Y

N

Soft Start

Monitor FB Voltage

Monitor VCC

OLP Fault

Logic High

Y

TSD, SCP

and Open-Loop

Monitor

Vcc Decrease

Shut Down

Internal High Voltage

Regulator

N

Fault Logic

High?

Y

N

Stop Operation

Y

N

Y

Turn On the

MOSFET

Y

N

Counts to 6144

Switching

Cycle?

Y

Y

N

Y

Open-Loop Logic High

Internal High Voltage

Regulator On

N

Shuts Down

Internal High Voltage

Regulator

Y

N

OLP Fault

Logic High?

Y

N

Reset Counter

Count Switching

Cycle

N

Figure 10—Control flow chart