MP155

Energy Efficient Off-line Regulator

MP155 Rev. 1.12

www.MonolithicPower.com

1

10/28/2013

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© 2013 MPS. All Rights Reserved.

The Future of Analog IC Technology

DESCRIPTION

The MP155 is a primary-side regulator that

provides accurate constant voltage regulation

without the opto-coupler, and supports Buck,

Buck-boost, Boost and Flyback topologies. An

integrated

500V

MOSFET

simplifies

the

structure and reduces costs. These features

make it a competitive candidate for off-line low-

power applications, such as home appliances

and standby power.

The

MP155

is

a

green-mode-operation

regulator. Both the peak current and the

switching frequency decrease as the load

decreases. As a result, it offers excellent

efficiency performance at light load, thus

improving the overall average efficiency.

The MP155 features various protections such

as thermal shutdown (TSD), VCC under-voltage

lockout (UVLO), overload protection (OLP),

short-circuit protection (SCP), and open loop

protection.

The MP155 is available in the TSOT23-5 and

SOIC8 packages.

FEATURES

• Primary-side constant voltage (CV) control,

supporting Buck, Buck-boost, Boost and

Flyback topologies

• Integrated 500V/20Ω MOSFET

• < 100mW No-load power consumption

• Up to 3W output power

• Maximum DCM output current of 130mA

• Maximum CCM output current of 220mA

• Low VCC operating current

• Frequency foldback

• Maximum frequency limit

• Peak current compression

• Internal high-voltage current source

• Internal 350ns leading-edge blanking

• Thermal shutdown (auto restart)

• VCC under-voltage lockout with hysteresis

(UVLO)

• Timer-based overload protection.

• Short circuit protection

• Open loop protection

APPLICATIONS

•

Home Appliances, white goods and

consumer electronics

•

Industrial Controls

•

Standby Power

All MPS parts are lead-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

MP155

DRAIN

VCC

FB

SOURCE

Output

SOURCE

C1

C2

L1

C3

C4

R2

R1

L2

D2

D3

C5

D1