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ON Semiconductor FSL336LRN

FSL336LRN Green Mode Fairchild Buck Switch


TopologyBuck Converter
Input voltage176-264 V
Output 184 V / 36 A
IC revision1.1


The FSL336LR integrated Pulse Width Modulator (PWM) and SenseFET is specifically designed for high-performance offline buck, buck-boost, and non-isolation flyback Switched Mode Power Supplies (SMPS) with minimal external components. This device integrates a high-voltage power regulator that enables operation without auxiliary bias winding. An internal transconductance amplifier reduces external components for the feedback compensation circuit.The integrated PWM controller includes: 10 V regulator for no external bias circuit, Under-Voltage Lockout (UVLO), Leading-Edge Blanking (LEB), an optimized gate turn-on / turn-off driver, EMI attenuator, Thermal Shutdown (TSD), temperature-compensated precision current sources for loop compensation, and fault-protection circuitry. Protections include: Overload Protection (OLP), Over-Voltage Protection (OVP), and Feedback Open Loop Protection (FB_OLP). FSL336LR offers good soft-start performance during startup.

The internal high-voltage startup switch and the Burst-Mode operation with very low operating current reduce the power loss in Standby Mode. As the result, it is possible to reach power loss of 120 mW without external bias and 25 mW with external bias when input voltage is 230 VAC.


  • Built-in Avalanche-Rugged SenseFET: 650 V

  • Fixed Operating Frequency: 50 kHz

  • No-Load Power Consumption: ◾25 mW at 230 VAC with External Bias;◾120 mW at 230 VAC without External Bias

  • No Need for Auxiliary Bias Winding

  • Frequency Modulation for Attenuating EMI

  • Pulse-by-Pulse Current LimitingUltra-Low Operating Current: 250 µA

  • Built-in Soft-Start and Startup Circuit

  • Adjustable Peak Current LimitBuilt-in Transconductance (Error) Amplifier

  • Various Protections: Overload Protection (OLP), Over-Voltage Protection (OVP), Feedback Open-Loop Protection (FB_OLP), Thermal Shutdown (TSD

  • Fixed 650 ms Restart Time for Safe Auto-Restart of All Protections

Typical applications

  • SMPS for Home Appliances and Industrial Applications
  • SMPS for Auxiliary Power


Order Code Data­sheet Downloads Product series Samples
Flyback Transformer, WE-FB
Order Code Data­sheet
Order Code Data­sheet Downloads Product series Samples