On Sunday 24 September 2006 10:46, Xiaofan Chen wrote:
> What is the requirement for the boost converter? For example,
> the input and output voltage, the efficiency requirement. Depending on
> the requirement, the design will be totally different.

Input is automotive voltage -- say 10V to 14V.  Output is approx 20V, and the 
higher current will be used to power some motors.  Efficiency is "as 
efficient as possible, within reasonable cost".  It's not a portable 
battery-powered device, so it does not have to be 99% efficient, yet, given 
the current requirement, I'd like it to be as efficient as possible so that 
there's less heat to be dissipated.  I know that's very shady, but I'm not 
familiar with the high-current design, so I would evaluate various 
efficiencies vs. cost ... that is, IF I have choices.


> 50A is not small current. 50A @3V will be 150W. 50A@24V will be
> 1.2kW and the design approach will be very different.
>
> The design which fits 1A@3V will not fit for the design of 50A@3V
> since the loss on the diode will be too much and you may have to use a
> synchronous boost design.
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