MP172

700 V Non-Isolated Off-Line Regulator

Up to 120 mA Output Current

MP172 Rev. 1.0

www.MonolithicPower.com

1

9/30/2015

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© 2015 MPS. All Rights Reserved.

The Future of Analog IC Technology

DESCRIPTION

MP172 is a primary-side regulator that provides

accurate constant voltage (CV) regulation

without an opto-coupler. It supports buck, boost,

buck-boost, and flyback topologies. It has an

integrated 700 V MOSFET to simplify the

structure and reduce costs. These features

make it an ideal regulator for off-line, low-power

applications, such as home appliances and

standby power.

MP172 is a green-mode-operation regulator.

Both the peak current and the switching

frequency decrease as the load decreases.

This feature provides excellent efficiency at light

load

and

improves

the

overall

average

efficiency.

MP172

has

various

protection

features

including thermal shutdown (TSD), VCC under-

voltage lockout (UVLO), overload protection

(OLP), short-circuit protection (SCP), and open-

loop protection.

MP172 is available in a small TSOT23-5

package and SOIC-8 package.

FEATURES

 Primary-Side CV Control, Supporting Buck,

Boost, Buck-Boost, and Flyback Topologies

 Integrated 700 V MOSFET and Current

Source

 < 30 mW No-Load Power Consumption

 Up to 3 W Output Power

 Maximum DCM Output Current Less than

80 mA

 Maximum CCM Output Current Less than

120 mA

 Low VCC Operating Current

 Frequency Foldback

 Limited Maximum Frequency

 Peak-Current Compression

 Internally Biased VCC

 TSD, UVLO, OLP, SCP, Open-Loop

Protection

APPLICATIONS



Home Appliances, White Goods, and

Consumer Electronics



Industrial Controls



Standby Power

All MPS parts are lead-free, halogen-free, and adhere to the RoHS directive. For

MPS green status, please visit the MPS website under Quality Assurance. “MPS”

and “The Future of Analog IC Technology” are registered trademarks of

Monolithic Power Systems, Inc.

TYPICAL APPLICATION

MP172

L

N

Input

C1

SOURCE

SOURCE

DRAIN

VCC

FB

C2

R1

L1

C4

D2

D1

VOUT

GND

R2

C3