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 undervoltage
lockout (UVLO), over-load protection
(OLP), short-circuit protection (SCP), and openloop
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