MP174A

700V Non-Isolated Off-Line Regulator,

Up to 400mA Output Current

with Improved EMI Performance

MP174A Rev. 1.0

www.MonolithicPower.com

1

2/27/2019

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

© 2019 MPS. All Rights Reserved.

DESCRIPTION

The MP174A is a primary-side regulator that

provides

accurate

constant

voltage

(CV)

regulation without an opto-coupler. It supports

buck, buck-boost, boost, and flyback topologies.

It has an integrated 700V 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.

The

MP174A

is

a

green-mode-operation

regulator. Both the peak current and switching

frequency decrease as the load decreases.

This feature provides excellent efficiency at light

load

and

improves

the

overall

average

efficiency.

The MP174A has various protection features,

including thermal shutdown (OTP), VCC under-

voltage lockout (UVLO), over-load protection

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

loop detection.

The MP174A is available in a small TSOT23-5

package and SOIC8 package.

FEATURES

 Primary-Side CV Control, supporting Buck,

Buck-Boost, Boost, and Flyback Topologies

 Integrated 700V/13.5Ω MOSFET and

Current Source

 <30mW No-Load Power Consumption

 Up to 5W Output Power

 Maximum DCM Output Current Less than

250mA

 Maximum CCM Output Current Less than

400mA

 Low VCC Operating Current

 Frequency Foldback

 Limited Maximum Frequency

 Peak-Current Compression

 Internally Biased VCC

 OTP, UVLO, OLP, SCP, Open-Loop

Detection

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 MPS website under Quality Assurance. “MPS”

and “The Future of Analog IC Technology” are Registered Trademarks of

Monolithic Power Systems, Inc.

TYPICAL APPLICATION