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Primary Side Regulated power switcher

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The AP39811 is a high performance power switcher integrated with aprimary side regulation controller and an integrated N-channel power MOSFET for the application of shaver charger. It is easy to achieve a targeted slant IV curve without an opto-coupler and secondary control circuitry. A resistor connected between FB pin and CPR pin is introduced to adjust the slew rate of the slant IV curve.

The AP39811 operates in Pulse Frequency Modulation (PFM) mode and peak current Amplitude Modulation (AM) mode to form a fine tune frequency curve within the whole power range. Therefore, AP39811 can achieve high average efficiency and avoid audible noise.

The AP39811 provides comprehensive protections without additional circuitry. It contains VCC over voltage protection, output over voltage protection, XFMR anti-saturation protection, bulk-cap open protection, open loop protection, over temperature protection, etc. The AP39811 is available in SO-7 package.


  • Primary Side Control for Eliminating Opto-Coupler
  • Built-In 650V Power MOSFET
  • Slant IV Curve Control
  • 75mW No-Load Input Power
  • Flyback Topology in DCM Operation
  • External Adjustable Line Compensation for CC
  • Multiple AM/PFM Control Mode to Improve Audio Noise and Efficiency
  • Frequency Jitter to Improve System EMI
  • Valley-On for the Higher Efficiency and Better EMI Behavior
  • Multiple Protections:
  • Over Voltage Protection (OVP)
  • Bulk-Cap Open Protection
  • Transformer Saturation Protection (TSP) via Primary Peak Current Limitation
  • Internal Over Temperature Protection (OTP)
  • SO-7 Package
  • Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
  • Halogen and Antimony Free. “Green” Device (Note 3)


  • Shaver Charger

Product Specifications

Product Parameters

BVDSS (Min) (V) 650 V
Collector DC Current (A) 1 A
StartupCurrent (µA) 3 µA
OperatingCurrent (µA) 650 µA
UVLOThresholdon/off (V) 16/6.8 V
Power Rating (W) 7.5 W
StandbyPower (Max) (mW) 75 mW

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Orderable Part Number Buy from Distributor / Contact Sales Request Samples


Authorized Distributor Quantity Inventory Date Countries/Regions Buy Online
Mouser Electronics Inc. 3395 10/4/2022 South America, North America, Asia, Europe, Middle East Buy Now
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Authorized Distributor Quantity Inventory Date Countries/Regions Buy Online
Digi-Key Electronics 11993 10/3/2022 Europe, Asia, North America Buy Now
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