FAN6240: Secondary-Side Synchronous Rectifier Controller for Flyback Converters

The FAN6240M6X is a secondary-side synchronous rectifier (SR) controller for an isolated flyback converteroperating in Discontinuous Conduction Mode (DCM). The adaptive dead-time control algorithm minimizes thebody diode conduction of SR MOSFET while guaranteeing stable and robust SR operation againstnoise and disturbance caused by the circuit parasitic. 30 V rated input voltage LDO and Low VDD Under-Voltage Lockout (UVLO) voltage allow FAN6240M6X to be used for wide ranges of switched mode power supplyoutput voltage without additional circuit.

特性

• Works in Discontinuous Conduction Mode (DCM).
• Adaptive Turn-off Trigger Blanking Time for easier use
• Turn-on Trigger Blanking Time (Minimum-OFF Time) for Improved Noise Immunity
• Supports High-Frequency Applications up to 200 kHz
• Minimum Turn-on Delay (20 ns)
• Adaptive Turn-off Threshold Control for Minimized SR MOSFET Body Diode Conduction (Dead-Time is independent of SR MOSFET)
• Wide Voltage Range for LDO Input up to 30 V
• Small Footprint: SOT-23 6 Pin Package