Need help in flyback isolated DC to DC cheapest IC of Monolithic possible solution?

DC-DC Power Converters
1

Hi, team,
can someone please help me to make DC-DC covert with the cheapest IC or solution with below :slight_smile:
input volt : 40-65v DC
o/p - 5v , 1-2 Amp

Also actually i wanted to avoid high costs, so I was planning to test AC to Dc supply only. that’s much more general & cost-effective
& i was expecting to support 60V AC too, ultimately this AC to dc circuit, also first converts AC to the same volt DC then step down.
but I tried a lot of ICs & most cheaper Switcher IC is available for AC 85+ volt, but not for below voltage, Please help if someone can help to understand, why most switcher IC only talk about AC only, while ultimately in their datasheet, they all convert AC to DC using bridge rectifier in their reference circuit.

2

Hello,

Is your input AC or DC? Where is it coming from?
Generally, a wider range buck converter will cost less than a flyback.

Best Regards,
Yu

3

They do it because that is where the market is. Universal input AC to DC converters 85VAC to 265VAC Covers Japan - 15% to UK +10%. Your observation is correct the AC is rectified to some DC voltage and that is what the converter runs on… So 10W of output power from 40V you are looking for a switch rated 1A maybe a bit higher 60V AC rectifies out to 90VDC so that requires a switch maybe around 200V with ringing. How about an MP6004?