发布时间:2022-12-26 08:38:45 作者: 赛威科技 来源:

High Power Factor Flyback PWM Controller


   Built-in Soft Start

   Very Low Startup Current

   Under Voltage Lockout with 8V Hysteresis

   VCC Over Voltage Protection (OVP)

   Clear External EA Feedback Network before Power On

   Transition Mode (TM) Operation

   Highly Linear Analog Multiplier

   Proprietary “Frequency Adjusting” for Higher PF and Low THD

   3.3us Min. OFF Time

   270KHz Max Frequency Clamp

   Trimmed 1.5% Internal Voltage Reference

   Restart Timer for Stand-alone Applications

   Cycle-by-Cycle Current Limiting

   Built-in Leading Edge Blanking (LEB)

   Audio Noise Free Operation

   10V to 32V Wide Range of VCC Voltage

  800mA Drive Capability



   LED Lighting Application

   Single Stage High PF Flyback AC/DC SMPS






SFL320 is a high power factor flyback PWM controller special for LED lighting applications. The IC adopts transition mode (TM) operation for high efficiency and low EMI. 

SFL320 will Clear External EA Feedback Network before IC power on. The IC also has Soft Start control to soften the stress on the MOSFET during power on period.

In SFL320, a highly linear analog multiplier is integrated to achieve low THD and high power factor. The zero current detector (ZCD) ensures TM operation. A restart timer is for stand alone applications. The IC also has the function of Min. OFF time and Max. Frequency Clamp to limits power MOS Vds spike when LED output is short.

In SFL320, the proprietary “Frequency Adjusting” can help to improve THD performance, while ensures audio noise free operation. A VCC Over Voltage Protection (VCC OVP) is integrated to improve system reliability.

SFL320 integrates functions and protections of Under Voltage Lockout (UVLO), VCC Over Voltage Protection (OVP), Soft Start Control, Cycle-by-cycle Current Limiting (OCP), GD Clamping, VCC Clamping, Leading Edge Blanking (LEB), etc.

In SFL320, VCC OVP is auto-recovery mode protection.

SFL320 is available in SOP-8 and DIP-8 packages.


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