>I am designing a peltier heater/cooler using PWM (10kHz, 12VDC @ 8A)
>and an H-bridge. To filter the ripples across the peltier, I plan to
>use an LC filter:
>
>                        ____ Peltier
>                   ----|____|----
>                   |            |
>                   |            |
>               L   |       C1   |   L
>              ___  |     ||     |  ___
>       V+ o---UUU--o-----||-----o--UUU---o V-
>                   |     ||     |
>                   |            |
>                   |            |
>               C2 ---          --- C2
>                  ---          ---
>                   |            |
>                  ^^^          ^^^
>                  GND          GND

It is not clear to me where you are driving this from, i.e. how you are
deriving the V+ and V- from the PWM.

>I am able to get multi-layer ceramic capacitors 16V,10uF in SMD1210
>package from Kemet/Murata. I have a few questions regarding these...
>
...
>
>4. If not, can anybody suggest alternate filtering methods for peltier
>coolers? The manufacturer (and past discussions on this list) say less
>than 10% ripple across the cooler.

I would suggest a single PWM drive into a device such as a UC1715, with a
pair of high current FETS (IRF530 or similar) into a buck regulator type
filter as used for switch mode power supplies. You can then use switch mode
supply application notes to calculate the required components for the
filter. A normal switchmode type filter will easily reach the 10% figure.

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