At 16:00 03/04/1997 +-100, you wrote:
>

>Some of the Speed controllers we use can handle MUCH more than 140 Amps =
>peak, and certainly 40 to 80 AMPS continuous at 8.4 volts. The low RDS =
>on needed is done by connecting several N-Channel FETs in parallel. Each =
>FET has RDS on of about 0.04 ohms (BUZ11) to around 0.018 ohms (BUZ346).

Best is today BUK9508-55 Rds_ON= 0.008. Diificult to obtain.
Near is Motorola MTP75N03HDL Rds_ON=0.0075 at VGs = 10V,
There is also International Rectifier, check their URL.
Don't forget
you will need a doubler/tripler to obtain the correct Vgs. There is
also some thermal loss due to the reverse diode included into the package.
Using an external "free-wheel" fast diode allows to decrease the temperature
and then to increase the total conduction current at a raisonable temprature.


>        BTW the application is for remote control of a combat "robot" =
>for robot
>battles competitions.

Good luck,
        Best regards,
                Philippe.

Please don't send attachement with your message to the piclist.

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