MP155
Energy Efficient Off-line Regulator
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
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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
Home Appliances, white goods and
consumer electronics
Industrial Controls
Standby Power
APPLICATIONS
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
D2
DRAIN
VCC
D3
L1
FB
C3
R1
C4
R2
L2
Output
SOURCE
SOURCE
C1
C2
MP155
D1
C5
MP155 Rev. 1.12
10/28/2013
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
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