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1000V output flyback

Category: Hardware
Product Number: LT8304

Hello,
I need to design a 1000V/10mA flyback converter to make ignition of a LEEFI. I saw the design note DN1047 that uses LT8304.
But I need an input voltage of 12v to 60v, and it is designed for 4 to 28v.
What I need to change at this design to adapt the input voltage to my necessary range? 
Would have another IC option or LT8304 is the better option?
The circuit will be used for rocket launch ignition with teledyne TE-100.
​​​​​​​Thank you.

www.analog.com/.../DN1047.pdf