FEBFSQ500L-H257V1-GEVB: Compact green mode controller FSQ500L; 5.1 V / 400 mA flyback design

This device combines a current-mode Pulse Width Modulator (PWM) with a SenseFET and high-voltage regulator connected from the DRAIN pin to supply the VCC. This device does not need to use bias winding and associated external components.

Using a SOT-223 package, FSQ500L reduces total size and weight while increasing efficiency, productivity, and system reliability. Using FSQ500L, this design example for 2.04 W can be implemented with few external components and minimized cost.
Features and Applications


Features
Overload Protection (OLP) and Internal Thermal Shutdown Function (TSD) with Hysteresis
Pulse-by-Pulse Current Limit
Under-Voltage Lockout (UVLO) with Hysteresis
Soft-Start Time Tuned by External Capacitor
Single-Chip 700 V SenseFET Power Switch
Auto-Restart Mode
Precision Fixed Operating Frequency: 130 kHz
Internal Startup Switch
No-load consumption 250 mW at 265 VAC with Burst Mode and Down to 60 mW with External Bias
No Need for Auxiliary Bias Winding