发布时间:2022-12-16 11:05:39 作者: 赛威科技 来源:

super-PFC/PSRTM Controller for LED Lighting


    super-PFC/PSRTM Control Supports Both Primary Side Regulation (PSR) and Secondary Side Regulation (SSR)

   Pin Compatible with Popular PFC Controllers

   THD<10% using min-THDTM Technique

   Built-in AC Line and Load Compensation for High Precision LED Output Current

   Highly Linear Analog Multiplier with “Frequency Adjusting” for High PF

   Max. 90KHz Frequency Clamping for EMI

   LED Open/Short Protection

   Burst Mode Control @ Light Loading

   Trimmed 1.5% Internal Voltage Reference

   Very Low Startup Current

   Under Voltage Lockout with 11.7V Hysteresis

   Built-in Soft Start

   Clear External EA Feedback Network before Power On

   Cycle-by-Cycle Current Limiting

   Built-in Leading Edge Blanking (LEB)

   VCC Over Voltage Protection (OVP)

   Audio Noise Free Operation

   10V to 32V Wide Range of VCC Voltage

   500mA Drive Capability



   LED Lighting Application


SFL900B is a high performance, high power factor flyback PWM controller special for LED lighting applications. The IC adopts unique super-PFC/PSRTM which can support both PSR and SSR applications.

SFL900B is pin compatible with mainstream PFC controllers such as XX6561/6562, XX7527, etc. SFL900B also integrates proprietary min-THDTM, technique, which can achieve less than 10% THD for universal line input.

SFL900B has built-in Load CC Compensation and AC Line CC Compensation function, which can further increase LED output CC accuracy. The IC has Max. 90KHz Frequency Clamping function and soft totem pole Gate driver to improve system conduction and radiation EMI. The IC will Clear External EA Feedback Network before IC power on, which can reduces startup LED current spike. The IC also has Soft Start control during power on period.

In SFL900B, the proprietary “Frequency Adjusting” can help to improve THD performance, while ensures audio noise free operation.

SFL900B integrates functions and protections of Under Voltage Lockout (UVLO), LED Open/Short Protection,  VCC Over Voltage Protection (OVP), Load Over Voltage Protection (Load OVP), Soft Start, Cycle-by-cycle Current Limiting (OCP), Burst Mode Control @ Light Loading, GD Clamping, VCC Clamping, etc. SFL900B is available in SOP-8 and DIP-8 packages.


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