Quasi Resonant Regulator with internal 700V MOSFET

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Product Description

The HF01B04 is a flyback regulator with Green Mode Operation. Its high efficiency feature over the entire input/load range meets the stringent world-wide energy-saving requirements. The HF01B04 is an integrated current mode controller with a 700V FET. Its valley switching detector ensures minimum Drain-Source voltage switching every cycle, per Quasi-resonant operation. When the output power falls below a given level, the regulator enters the burst mode to lower the stand-by power consumption. An internal minimum off time limiter prevents the switching frequency from exceeding 150 kHz, which is below the CISPR-22 EMI start limit. Internal 2.4ms soft start prevents the excessive inrush current during start up The HF01B04 provides various protections, such as Thermal Shutdown (TSD), VCC Under Voltage Lockout (UVLO), Over Load Protection (OLP), Over Voltage Protection (OVP) and so on. HF01B04 is available in PDIP8-7B and SOIC8-7B packages.

Product Features

  • Internal Integrated 700V MOSFET
  • High Level of Integration, Requires Very Few External Components
  • Universal Input Voltage (85~265VAC)
  • Quasi-Resonant Operation over the Entire Input and Load Range
  • Maximum Switching Frequency Limited
  • Valley Switching for High Efficiency and Better EMI Performance
  • Active Burst Mode for Low Standby Power Consumption
  • Internal High-Voltage Current Source for Start-Up
  • Internal Soft Start
  • Internal 320ns Leading Edge Blanking
  • Thermal Shutdown (Auto Restart with Hysteresis)
  • VCC Under Voltage Lockout with Hysteresis (UVLO)
  • Over Voltage Protection
  • Over Load Protection.
  • No Load Consumption at 265Vac, HF01B04<30mW


  • Vac (min) (V)85
  • fsw (max) (kHz)150
  • Vbr (V)700
  • Vac (max) (V)305
  • VCC (max) (V)22
  • Typical Pmax (W)8
  • Min Off Time (µs)7.8
  • trestart (µs)4.6
  • PackagePDIP8-7B, SOIC8-7B
  • TypeRegulator
  • GradeCatalog
  • Control MethodQuasi-Resonant
  • Power Range DefinedNo
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