MSR1 robot board H bridge

Damo2

·The standard H bridge on the MSR1 robot controller is rated around 1.5 amps I think. Is there any easy way I can increase this to 3-4 amps with some simple components,· (FETS ect), but still use the original H bridge as the primary controller, or is adding a·higher powered H bridge·and controlling fom another output·the only option ?

Thansk all.

rpdb

The listed rating on the L6205 H-bridge is 2.8 A per channel or 5.6 A total pulsed output. These are the Absolute Maximum ratings for the chip, but I would suggest to leave some head room i.e 80% or less of max continuous for long life. I don't know if the MRS1 circuit board traces are designed for that, but the MRS1 manual suggest it is. The chip has themal and over-current protection/shutdown built in, so I assume you could run 100% for short period. Apply a good heat-sink with thermally conductive epoxy, if you dare to push the limits. Other than that the HB25s are rated at 25 amperes.

Damo2

Thanks, I've got the H bridge working now, it seems that my 6V battery pack won't run the H bridge, the 7.2v race pack I have will. I checked the specs for the L6205, operating voltage is 8v min ? Seems odd when the rest of the board is designed to work with 6v or higher.

At least now I can continue with my project, and just monitor the temp of the L6205.

I must say, I'm very impressed with the speed and capabilities of the propeller.