Quoting Cedric Chang <cc@nope9.com>:

> Driving a Peltier cooler which I thought could be treated as a
> current sensitive process ?
> Why does ripple matter ?

Because it GREATLY reduces the (already miserable) efficiency of
the TEC. More than 5%-10% ripple is not recommended. The available
delta-T is reduced by a factor of:

1/(1+(ripple_current/dc_current)^2)

Of course if the inductor is big enough you don't need an output
cap at all, but an inductor that won't saturate or overheat at
10A DC will start to get large/expensive at higher inductances.

Best regards,
Spehro Pefhany


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