900V Offline Switching Regulator

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Product Description

The HF900 is a flyback regulator with an integrated 900V MOSFET. Requiring a minimum number of external components, the HF900 provides excellent power regulation in AC/DC applications that require high reliability. These applications include smart meters, large appliances, industrial controls, and products powered by unstable AC grids.

The regulator uses peak-current-mode control to provide excellent transient response and easy loop compensation. When the output power falls below a given level, the regulator enters burst mode to lower the standby power consumption.

The MPS proprietary 900V monolithic process enables over-temperature protection (OTP) on the same silicon of the 900V power FET, offering precise thermal protection. Also, it offers a full suite of protection features such as VCC under-voltage lockout, over-load protection, over-voltage protection, and short-circuit protection.

The HF900 is designed to minimize electromagnetic interference for wireless communication in home and building automation applications. The operating frequency is programmed externally with a single resistor, so the power supply’s radiated energy can be designed to avoid the interference with wireless communication.

In addition to the programmable frequency, the HF900 employs a frequency jittering function that not only greatly reduces the noise level but also reduces the cost of the EMI filter.

The HF900 is available in SOIC14-11 and PDIP8-7EP packages.

Product Features

  • Internal Integrated 900V MOSFET
  • Programmable Fixed Switching Frequency up to 300kHz
  • Frequency Jittering
  • Current-Mode Operation
  • Internal High-Voltage Current Source
  • Low Standby Power Consumption via Active Burst Mode
  • Internal Leading Edge Blanking
  • Built-In Soft-Start Function
  • Internal Slope Compensation
  • Built-In Input Over-Voltage Protection
  • Over-Temperature Protection (OTP)
  • VCC Under-Voltage Lockout with Hysteresis
  • Over-Voltage Protection on VCC
  • Time-Based Overload Protection
  • Short-Circuit Protection (SCP)


  • Vac (min) (V)85
  • fsw (max) (kHz)300
  • Vbr (V)900
  • Vac (max) (V)440
  • VCC (max) (V)24.5
  • Typical Pmax (W)8
  • 封装PDIP8-7EP, SOIC14-11
  • TypeRegulator
  • GradeCatalog
  • Control MethodFixed Frequency
  • Power Range DefinedNo

Reference Materials