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You better model the voltage divider you are planning. I think you will find your balancing resistors will waste as much power as a dropping resistor and a zener.
Push pull requires switches 2x the bus voltage + margin.
Buck requires a 12v/1000v duty cycle as Mr Kluas reports - not likely...
Playing devil's advocate here?
1) Why do you need 20 turns?
2) Have you looked at a smaller bobbin?
3) Have you thought of interleaving all of the turns on one layer? Seems like they may fit considering you say 2mm/turn across the bobbin. The primary-secondary capacitance does increase...
The TL-431 is an adjustable three terminal regulator. There are two resistors that can be coordinated in order to fine tune the output voltage. You should be able to get 5v to be very accurate.
The zener approach would require you to use a part with less than 5v in order to account for the...
Re: calculating Inrush current limiter
Are you talking about inrush current when the line voltage is applied to the power supply?
The statement where the inverter is reducing instantaneously when inrush current occurs is confusing.
Is there a specification that you are designing to? It...
I think Power Integrations uses continuous current flyback supplies which contain the RHP Zero. I believe they roll off the gain early or some other mechanism to limit the slew rate of the PWM. In other words the controller takes quite a bit of time to change from one duty cycle to another...
The main reason(s) for an inrush limiter are to prevent (1) diodes from failing and to (2)control the voltage on the capacitor bank. (The customer/end user might also get cranky if his breakers trip when energizing his power supply) Do you have another reason for limiting inrush? Inrush...
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