Primary-side controller

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Product Description

The MP023 is an offline, primary-side controller that provides accurate, constant voltage and constant current regulation without the need of an optocoupler or secondary feedback circuit. It uses an integrated 700V current source to achieve quick start-up.

The MP023's variable off-time control allows its flyback converter to operate in discontinuous conduction mode (DCM). The MP023’s current limit and maximum secondary duty cycle are programmable, making the output current easily set. The FB voltage sensing point is also programmable and is able to set different switching frequencies.

The internal high-voltage start-up current source and power-saving technologies limit the no-load power consumption to less than 30mW. Full protection features include VCC under-voltage lockout (UVLO), overload protection (OLP), over-temperature protection (OTP), open loop protection (OCkP), and over-voltage protection (OVP).
The MP023's variable switching frequency method provides a natural spectrum for shaping a smooth EMI signature, which is suitable for offline, low-power battery chargers and adapters.

The MP023 requires a minimal number of readily available, standard, external components and is available in a SOIC8-7A package.

Product Features

  • Primary-Side Control without Optocoupler or Secondary Feedback Circuit
  • Precise Constant Current and Constant Voltage Control (CC/CV)
  • Variable Off-Time Peak Current Control
  • 700V High-Voltage Current Source
  • 20mW No-Load Power Consumption
  • Programmable Cable Compensation
  • Programmable Current Limit and Maximum Secondary Duty Cycle
  • Programmable FB Voltage Sensing Point
  • Multiple Protection Features: OVP, OCkP, OLP, OTP, VCC UVLO
  • Low Cost and Simple External Circuit
  • Available in a SOIC8-7A Package


  • Power Range DefinedNo
  • GradeCatalog
  • TypeController
  • Vfb (V)4
  • Vac (max) (V)265
  • Vbr (V)700
  • fsw (max) (kHz)75
  • PackageSOIC8-7A
  • Vac (min) (V)85
Quality Policy, Certificates & Reliability Reports
All MPS parts are lead-free, halogen-free and adhere to the RoHS directive. See Environmental section for details.