The HFC0310 is a flyback controller with fixedfrequency operation. The controller uses peak current mode to provide excellent transient response and ease loop compensation. When the output power falls below a given level, the controller enters burst mode to lower the stand-by power consumption. An external capacitor connected between the FSET pin and GND programs the HFC0310 switching frequency. Otherwise, the HFC0310 uses a frequency shaping function that greatly reduces the noise level, and reduces the cost of the EMI filter. The HFC0310 provides various protections, such as thermal shutdown, VCC under-voltage lockout, over-load protection, over-voltage protection, and short-circuit protection. The HFC0310 is available in a SOIC8 package.Programmable switching frequency up to 600kHz Frequency shaping (±3.5%) Current-mode operation Very low start-up current (12µA) Very low standby power consumption via active-burst mode Internal 350ns leading-edge blanking Built-in 3ms soft-start function Internal slope compensation Built-in PRO pin pull-up (>3.25V) autorestart function Over-temperature protection VCC under-voltage lockout with hysteresis Over-voltage protection on VCC Time-based over-load protection Short-circuit protection