Subject:
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Info about Robostore H-bridges
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Sat, 28 Mar 1998 01:19:02 GMT
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Original-From:
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Frangois <moonfish@club-internet.*nomorespam*fr>
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Viewed:
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1167 times
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Hello,
I have just ordered 2 h-bridges from Robotstore
I haven't received them yet but here are the informations they sent me
about one of this H-Bridges;
It may help...
François G.
> We intend to buy your Maxi Dual H-Bridge ((kit
> 3-302- #- $39.95).
>
> > > But before we would like to know a few things :
>
> > > Thanks for your interest. The kit has just been
> upgraded to TFXCM3.1- here are the short & sweet
> answers to your questions- links appear at the end of
> this so you can download data sheets for the
> important parts.
> > >
> > > 1) What is the continuous current each bridge can • provide if we use 12V DC
> > > motors
>
> If you provide heat sinking to keep the FETs below
> 100 degrees Centigrade, the FETs will do 20A
> continuously. Note that operating the devices at
> maximum ratings will shorten the MTBF.
> > >
> > > 2) What is the peak(maximum) current each bridge
> can undergo?
>
> Peak pulsed drain current of a FET, maximum is 110A
> as long as junction temperature is limited.
> > >
> > > 3) Can we connect the two outputs of a double • H-Bridge to a single motor
> > > to get higher current supply?
>
> FETs are inherently easy to parallel (the RDSon
> increases with junction temp., acting to lower the
> current through a hotter FET)- but rather than
> connect two controllers together, it would be better
> to double up on the power FETs on a single controller
> so all FETs share the same logic circuitry. Also,
> note that power sharing is best if they all share a
> common heatsink.
> > >
> > > 4) Can we interface it with the HewletPackard • HCTL1100 motor driver (
> > > that is the motor driver we plan to use)?
>
> I have no info on the HP device mentioned...
> > >
> > > 5) Is there any limitation regarding the PWM • commands we have to send to
> > > the bridge?
>
>
> > > It is recommended that the minimum pulse width of
> any PWM scheme be 100uS. The pulse width is limited
> by the optoisolator delay and the capacitance at the
> FET's gate. You should be able to exceed the
> recommended minimum- but hook the controller up to a
> scope to verify, especially if you are parallelling
> FETs.
>
> http://digikey.com
> this link to a retailer will let you look up data
> sheets for the two important parts: PS2501-4,
> optoisolator, and IRLZ34N HEXFET. They also provide
> an industry link to International Rectifier, makers
> of the HEXFET, from whom you can download SPICE models!
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