SFL900C
super-PFC/PSRTM Controller for LED Lighting
FEATURES
◆ 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
APPLICATIONS
◆ LED Lighting Application
SFL900C 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.
SFL900C is pin compatible with mainstream PFC
controllers such as XX6561/6562, XX7527, etc.
SFL900C also integrates proprietary min-THDTM,
technique, which can achieve less than 10% THD for
universal line input.
SFL900C 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 SFL900C, the proprietary “Frequency Adjusting”
can help to improve THD performance, while ensures
audio noise free operation.
SFL900C 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.
SFL900C is available in SOP-8 and DIP-8 packages.
GENERAL DESCRIPTION
TYPICAL APPLICATION (PSR Application)
EMI
Filter
SFL900C
1 FB
VCC 8
2 COMP
3 MULT
4 CS
GD 7
GND 6
DEM 5
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SiFirst_DS_900C_V1.0
