Hi,
If I need peak power of 300Watt but I just use with an average power of 5 Watt, can I just design a 5 Watt converter with components rating meeting the 300Watt?
Thanks, JL
Hi,
If I need peak power of 300Watt but I just use with an average power of 5 Watt, can I just design a 5 Watt converter with components rating meeting the 300Watt?
Thanks, JL
Depends on how long you need the 300W, how often, and so on. Some more specs are needed.
-- Regards, Joerg http://www.analogconsultants.com/
I found this, looks like ok because my duty cycle is low (~2%), things for concern is output cap rating, temperature increasing inside the xfmr etc.
I am not a fan of those integrated switches. Too boutiquish for me, and I've seen failures (but was another brand).
Again, things like cap size and device heating will also depend on the duration you need 300W for. 2% on-time every hour is very different than
2% every millisecond :-)-- Regards, Joerg http://www.analogconsultants.com/
Since you don't say how the 5W average is arrived at, we can't say. If you're delivering 300W for one day, then off for 59, then on again, you need to design a 300W converter. Even if you're on for one minute, then off for 59, etc., then you _still_ need to design almost everything except for the bulk heat sinking for 300W -- and at that you may as well go all the way.
I think you probably just need to design a 300W converter and be happy.
-- Tim Wescott Wescott Design Services
The stuff from Powerint is pretty good and devices I designed in >10 years ago are still available for purchase from (for example) Digikey.
-- Failure does not prove something is impossible, failure simply indicates you are not using the right tools...
BTW, Joerg, those FDC6020Cs half H-bridge FETs you recommended have since been discontinued.
Cheers
Phil Hobbs
-- Dr Philip C D Hobbs Principal Consultant
Yeah, stuff can be short-lived these days and it was just an example. Mouser still has over 30,000 of them though, under 50 cents.
But they make lots and lots of others. A little larger but cheaper:
If too large you can get TSSOP as well:
Not sure if I remember the requirements right but take a look at the datasheet. There's oodles more like that. Companies such as Alpha&Omega, Diodes, IRF, Rohm, Thomson, Toshiba, Vishay and so on. If you can stomach SO8 size for each pair that would offer the most sources. Otherwise maybe TSSOP.
-- Regards, Joerg http://www.analogconsultants.com/
Yeah, I have a TSSOP one, the SI6562CDQ. Just wanted to let you know in case the other one was a favourite.
Cheers
Phil Hobbs
-- Dr Philip C D Hobbs Principal Consultant
No such thing as peak power. Power is defined as instantaneous or average power. Often peak power is quoted by hi-fi buffs to make their amps seem more powerful than they are!
Hardy
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