Can you please provide some additional design details? 1. What is your maximum output power? 60Watt 2. Do you plan to use an ordinary diode bridge for the input rectification or synchronous rectifiers to reduce power and voltage loss? This ordinary bridge is for trial, later we can use synchronous rectifier. 3. Do you have any expected efficiency estimates? approx. 90% 4. Is the 15V VCC bias provided by an external voltage source? No it is internal, from output 24 (Zener, transistor and resistor as shown in schematic)
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