> -----Original Message-----
> From: Kyrre Aalerud [SMTP:kreature@C2I.NET]
> Sent: Tuesday, May 13, 2003 7:25 PM
> To:   PICLIST@MITVMA.MIT.EDU
> Subject:      Re: Peltier cooler question
>
> Correct.  PWM on a peltier will cause damage to the unit.
> Max ripple should be less than 1% and on/off cycle should be as long as
> possible and never below 1 minute.
>
High frequency PWM will not cause damage to a TEC.  However, the higher the
ripple current, the bigger the hit on performance.  Low frequency PWM will
cause damage in the long term through thermal cycling of the device.

TI and Maxim both make PWM drivers for TEC controllers.

Mike



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