Monolithic Power Systems MP155

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 lowpower 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

Remarks

• L1=1mH,L2=2.2mH are used refer page no-16 Figure-11

Typical applications

• Standby Power
• Industrial Controls
• Home Appliances,white goods and consumer electronics

More information

• Datasheet
• IC product information