DESCRIPTION
The MP173A is a primary-side regulator that provides accurate constant voltage (CV) regulation without an optocoupler. It supports buck, boost, buck-boost, and flyback topologies.
The device’s integrated 700V MOSFET simplifies the structure and reduces cost. This feature optimizes the device for offline, lowpower applications, such as home appliances and standby power.
The MP173A is a green mode operation regulator. Both the peak current and switching frequency lower as the load decreases. This feature provides excellent efficiency at light load, and improves the overall efficiency.
Protection features include thermal shutdown (TSD), VCC under-voltage lockout (UVLO), overload protection (OLP), short-circuit protection (SCP), and open-loop detection.
The MP173A is available in TSOT23-5 and SOIC-8 packages.

FEATURES
 Primary-Side CV Control
 Supporting Buck, Buck-Boost, Boost, and Flyback Topologies
 Integrated 700V MOSFET and Current Source
 Under 30mW No-Load Power Consumption
 Up to 4W Output Power
 Maximum DCM Output Current Below 180mA
 Maximum CCM Output Current Below 280mA
 Low VCC Operating Current
 Frequency Foldback
 Limited Maximum Frequency
 Peak Current Compression
 Internally Biased VCC
 TSD, UVLO, OLP, SCP, and Open-Loop Detection
 Available in TSOT23-5 and SOIC-8 Packages

APPLICATIONS
 Home Appliances, White Goods, and Consumer Electronics
 Industrial Controls
 Standby Power