The volume is high, aprox. 30K units/month. 
The application is a hairdryer, and space is critical. They can't even put a
35x45 capacitor we were considering.

The LV supply is relatively easy to solve. The problem is the HV supply with
the high current requirements and the required ripple. What I'm trying to
avoid somehow is the large capacitor.

Regards,

> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On
> Behalf Of Apptech
> Sent: Thursday, January 31, 2008 01:50
> To: Microcontroller discussion list - Public.
> Subject: Re: [EE] Cheap power supply
> 
> >  I'm trying to find a solution for a power supply. It will
> > supply power to
> > an appliance, so it should be as inexpensive as possible.
> > It will also have
> > to be as small as possible since the design department
> > says I have no more
> > room to play with :)
> >
> >  The requirements are:
> >
> > Vout1: 100Vdc 3A continuous and 10A peak (<5sec) to drive
> > a DC motor
> > (unregulated)
> >
> > Vout2: 12~15V 15mA continuous to drive some mosfets
> >
> > Vout3: 5V 15mA for a PIC
> >
> >
> > Ideally, it will be for 100~240 Vac input voltage,
> > preferably but not
> > mandatory with automatic voltage selection.
> >
> > A transformer is not viable, since there is no room for
> > it.
> 
> 
> You MUST say what sort of voolume you have available.
> 
> Who says that there is no room for a transformer.
> 
> The LV supplies require about 300 mW of power - extremely
> small.
> 
> Is the HV supply acceptable as is?
> 
> Why not use an eg TO92 sized or surface mount voltage
> regulator?
> 
> 
>         Russell
> 
> 
> 
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