Re: [CAD_CAM_EDM_DRO] Chopper max voltage?

Without automatic reduced current the l298 doesn't last very long at 36VDC
@2A. even with a massive heatsink and fan. I changed the design to use
automatic reduced current and they seem to hold up very well. My new 3axis
2A board has this feature. I recommend that beginners stay under 18V because
of their propensity to use an inadequate heatsink and or fans above this
voltage.
Dan
-----Original Message-----
From: Mike <mnels@...>
To: CAD_CAM_EDM_DRO@egroups.com <CAD_CAM_EDM_DRO@egroups.com>
Date: Wednesday, October 04, 2000 9:41 AM
Subject: Re: [CAD_CAM_EDM_DRO] Chopper max voltage?

>At 05:57 PM 10/4/2000 +1300, you wrote:
>
>>The rating of the L298 is 46V, and absolute max 50V.
>>
>>I've personally run them at up to 35V without any problems.
>
>Dan Mauch claims the L298 won't run over 18 volts, even with a big
>heatsink, without getting too hot if you're running anywhere close to 2
>amps with it. He sells a L298 based board so I assume he'd know?
>
>I know the datasheet specifies much higher voltages, but they also specify
>a maximum power dissipation value. I suspect it's a complex combination of
>frequency, current, voltage and perhaps even the inductance of the motors
>that determines how hot the L298 will get.
>
>So is Dan just trying to sell his bigger 5 amp controller or does the L298
>really get too hot over 18 volts? How much current are you running at 35
>volts?
>
>
>
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