RC-Monster Forums - View Single Post - Higher pinions = safer MMM's? Or no? Someone's lying....

BrianG · 09.29.2009, 11:37 AM

I think the higher back-EMF voltage/current when braking with lower gearing is stressing the TVS device until it blows and then there is no protection anymore, so those high transients are free to do all kinds of damage to the FETs (which only have a 30v rating IIRC).

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BrianG RC-Monster Admin Offline Posts: 14,609 Join Date: Nov 2005 Location: Des Moines, IA	09.29.2009, 11:37 AM I think the higher back-EMF voltage/current when braking with lower gearing is stressing the TVS device until it blows and then there is no protection anymore, so those high transients are free to do all kinds of damage to the FETs (which only have a 30v rating IIRC).