PT4209-Primary Side Offline LED Controller with Active PFC PDF文档下载

GENERAL DESCRIPTION
   The PT4209 is a flicker-free PWM/analog dimmable, primary side constant current controller which can achieve high power factor in a single stage converter, targeted to applications in solid state lighting. It is designed for the flyback topology, and regulates output current accurately without the secondary feedback loop. PT4209 works in quasi-resonant mode to reduce the MOSFET switching loss. The device uses extremely low startup and low quiescent current to achieve high efficiency. A complete set of integrated protection functions allows the PT4209 to protect against all fault conditions such as VCC under-voltage, VCC over-voltage, cycle by cycle current limit, output open/short circuit, Rcs open circuit, transformer winding short circuit and over temperature shut down.
   The PT4209 is available in SOP8 package.

FEATURES
 Constant Current Control Without Secondary Feed back
 Flicker-free PWM/analog Dimming (10%-100%)
 Accurate Constant Current Output
 Quasi-Resonant Mode Operation
 Ultra-low（10uA）Start Up Current
 Low Quiescent Current (1mA)
 VCC Under Voltage Protection
 Over Voltage Protection by Voltage Holding
 Cycle by Cycle Current Limit
 Rcs Open Circuit Protection
 Transformer Winding Short Circuit Protection
 Output Open/Short Circuit Protection
 Over Temperature Protection

APPLICATIONS
 Solid State Lighting
 Industrial and Commercial Lighting
 Residential Lighting