Offline Primary Side 6W Regulator

Talk to an Engineer or get a Quote
Upgrade to myMPS+

Product Description

MP157 is a primary-side regulator providing accurate constant voltage (CV) regulation without the Opto-coupler. It supports Buck, Buck-Boost, Boost and Flyback topologies. A 500V MOSFET is integrated in the regulator, so very simple structure and low cost can be achieved. These features make MP157 an ideal solution for off-line low power applications.  Typical applications include home appliance, standby power and industrial control. MP157 is a green mode operation regulator. When the load decreases, the peak current and the switching frequency decrease with the load. As a result, it still offers excellent efficiency performance at light load, thus better average efficiency is achieved. MP157 features various protections like Thermal Shutdown (TSD), VCC under Voltage Lockout (UVLO), Over Load Protection (OLP), Short Circuit Protection (SCP), Open Loop Protection. MP157 is available in the TSOT23-5 and SOIC8 packages.

Product Features

  • Primary-side constant voltage (CV) control, supporting Buck, Buck-Boost, Boost and Flyback topologies
  • Integrated 500V/10Ω MOSFET
  • < 100mW No-load power consumption
  • Up to 6W output power
  • Maximum discontinuous conduction mode (DCM) output current less than 225mA, maximum continuous conduction mode (CCM) output current less than 360mA
  • Low Vcc Operating Current
  • Frequency Foldback
  • Limited maximum frequency
  • Peak Current  Compression
  • Internal High Voltage Current Source
  • Internal 400ns Leading Edge Blanking
  • Thermal Shutdown (auto restart)
  • VCC Under Voltage Lockout with Hysteresis (UVLO)
  • Timer based Over Load Protection
  • Short Circuit Protection
  • Open Loop Protection


  • Vac (max) (V)265
  • Vfb (V)2.5
  • ICC Latch (typ) (µA)16
  • Vbr (V)500
  • Rds(on) (Ω)10
  • fsw (max) (kHz)64
  • Isw Limit (mA)640
  • Iout (DCM) (max) (mA)225
  • Iout (CCM) (max) (mA)360
  • Pout (max) (W)6
  • Vac (min) (V)20
  • VCC Off (V)3.35
  • Power Range DefinedNo
  • Control MethodOn-Off
  • 封装SOIC-8, TSOT23-5
  • GradeCatalog
  • TypeBuck Regulator
  • VCC Hysteresis (V)0.23
  • Min Off Time (typ) (µs)13.1
  • VCC Restart (V)2.35
  • No-Load Pout (max) (mW)100
  • Iregulator (mA)3.5
  • Ileak (µA)10