looking for a very low cost power supply design

[baba_sanfur]

Power supply design

Hi,

I'm looking for a very low cost power supply design.
My needs are:
3.3v @ 50ma
12v @ 120ma
I tried the "Power integration" DI-139 (Buck), but the cost of it was ~$1.6 (1K units). I'm looking for something much cheaper.
I considered the Transformless approach – but the currents are less than I need.
I started to think about other SMPS, such as flyback – but the custom transformer seems a problem (cost / availability).

Based on your experience, what would you suggest? Do you know a design which will fill my requirements, and still will be very cheap? Chip manufacture with relevant prices / application notes?

Thanks,
Nir

 

[mfarooq1]

Power supply design

You can find a SMPS its common, search it in ur local market or dealers on net

 

[baba_sanfur]

Re: Power supply design

Hi,
Thanks for your reply, but the power supply I would like to build is going to be in a product - so the price is very impotent. Local dealers are much more expensive than to build simple SMPS

Any ideas?