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Technical content
©SiFirst Technology - 1 - Confidential SiFirst_DS_900B_V1.0 SFL900B
FEATURES
◆ super-PFC/PSRTM Control S upports 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 M ultiplier 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
APPLICATIONS
◆ LED Lighting Application GENERAL DESCRIPTION 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 (UV LO), 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. TYPICAL APPLICATION (PSR Application) EMI Filter GD CS VCC1
4 DEM
super-PFC/PSRTM Controller for LED Lighting Sifirst Confidential
©SiFirst Technology - 2 - Confidential SiFirst_DS_900B_V1.0 SFL900B TYPICAL APPLICATION (SSR Application) EMI Filter CS GATEDEMVCC GND SFL900BMULT FB COMP SFL100 Pin Configuration FB COMP 3MULT VCC GD GND DIP8/ SOP8 5CS DEM Comparison between SFL900 and SFL900B Parameter or Function SFL900 SFL900B VDD UVLO(ON)/(OFF) 17V/9V 20.7V/9V Recommended Loop Compensation Capacitor between FB pin and COMP pin 100nF 1uF
Ordering Information
Part Number Top Mark Package Tape & Reel SFL900BSG SFL900BSG SOP8 Green SFL900BSGT SFL900BSG SOP8 Green Yes SFL900BDP SFL900BDP DIP8 RoHS Sifirst Confidential