3kV flyback design with LT8302

Question

Hello, 
 
 Actually I want to design a 3kV/4W generator.I don't want to generate 3kV directly at the out of the flyback transformer (Because of the size of the transformer) but to generate 1.5kV and to add a voltage doubler. 
 Without the voltage doubler I have 1.5kV at the output. When I add the voltage doubler the voltage is not multiplied by 2 (In fact at the secondary we dont have a symetric voltage) and more the voltage at the secondary is weaker with 50nF in the voltage doubler and 4500V with 10nF in the voltage doubler. 
 I don't find how to design a flyback power with voltage doubler (Because I think that the impedance of the voltage doubler is most important to design the flyback DCDC), do you have informations, a paper, or recommendation ? 
 Input parameters to design it : 
 Vin : 3.7V - 4.2V 
 Vout : 3000kV 
 Pout : 4W 
 Non isolated 
 
 Best Regard's 
 
 LT8302_1500V.asc

W.G · Accepted Answer

This IC is not suitable for the application. If you include leakage inductance and parasitic capacitance to the transformer model, the simulation probably won't work properly. 
 Here is a high voltage design. A design with more than 1000Vout would be very challenging. 
 https://www.analog.com/media/en/technical-documentation/tech-articles/1000-V-Output-No-Opto-Isolated-Flyback-Converter.pdf)

Partner Forums

Partner Libraries

Products Mentioned

3kV flyback design with LT8302