Power supply 800V -> 48V using INN3996CQ
I would like to design a power supply from 200-800Vdc to 48Vdc/15W using a INN3996CQ.
My approach is to get inspiration from the P.I. application "DER-889q" for a power supply with output 12V/15W. In that application the pin 6 (Vout) is directly connected to the output to supply the secondary side of the chip, but I can't do the same because 48V is to high (maximum rating for Vout is 27V). So my questions are:
- can I use a linear regulator (a zener, a zener+BJT, a LDO, ...) to the pin Vout to supply the secondary side from 48V?
- what is the current absorption (I didn't find this information on the datasheet)?
- If I renounce to the synchronous rectifier can I reduce the current consumption of the secondary side?
Many thanks in advance for your support,