MP150 Offline Primary-Side Regulator For Low Power Applications TSOT23

MP150 Offline Primary-Side Regulator For Low Power Applications TSOT23

MP150 is a primary-side regulator that provides accurate constant voltage (CV) regulation without the opto-coupler, and supports Buck, Buck-boost, Boost and Flyback topologies.

Key Specifications

Features

• Primary-side constant voltage (CV) control, supporting Buck, Buck-boost, Boost and Flyback topologies
• Integrated 500V/30Ω MOSFET
• < 150mW No-load power consumption
• Up to 2W output power
• Maximum DCM output current less than 120mA
• Maximum CCM output current less than 200mA
• Frequency foldback
• Maximum frequency limitation
• Peak current compression
• Internal high-voltage current source

Typical Application Circuit

Applications

• Home Appliance, White Goods and Consumer Electronics
• Industrial Controls

Design Notes

• The PFC inductor must support the maximum duty cycle at the lowest line voltage, which is where saturation risk peaks.
• High-voltage startup and X-capacitor discharge paths dominate no-load standby loss; verify them against the efficiency target.
• Leakage inductance and the RCD clamp set the turn-off loss — snubber values are a thermal trade-off, not a fixed recipe.
• Synchronous rectification timing must track the primary switching; a mistimed SR FET conducts through its body diode and fails hot.

Common Questions