Newsgroups: comp.robotics
Path: brunix!sgiblab!swrinde!gatech!howland.reston.ans.net!pipex!uknet!comlab.ox.ac.uk!dflsun
From: dflsun@robots.ox.ac.uk (Fenglei Du)
Subject: Re: H-Bridge?
Message-ID: <1993Dec16.091826.2797@juliet.robots.ox.ac.uk>
Originator: dflsun@juliet.robots
Organization: Robotics Research Group, Engineering Science Dept, Oxford, UK.
Date: Thu, 16 Dec 1993 09:18:26 GMT
Lines: 46


>Greetings All,
>    Again, I know, a topic about beat to death. Okay to respond briefly,
>or privately..
> I saw the post on MOSFET
>switches and how to set them up in an H-Bridge structure. Fine, but I
>can't deal with the 10 volt 'differential'. I need to build an
>H-Bridge using power transistors, capable of handling roughly 6A @ 12 volts.
>    Anyone have any suggestions on what transistors fit the bill? I know
>that four 2222's can drive little-bitty motors okay, but if I hang a
>pair of DC 24 volt conveyor/gearmotors on that.. For some reason I
>get a little concerned...
>     <sizzle sizzle>  (Hey, is that bacon?? Oww!)

>    I know about the infamous MAX motor control chip, I think we've got 
>some on order. But as the rest of you know..  They are on back-order from
>just about everybody (2/3rds of you are probably waiting with me!) So for 
>the time being, I'd like to play around with the 'old fashioned' models.

>    Numbers anyone? 


	A better idea is  using a integrated H-bridge rather than to get one 
using MOSFETs by yourself. only a PWM signal and a direction singal is needed 
to drive the H-bridge. Generally, the inputs are TTL and/or CMOS compatible.
 Two numbers come to mind: L6203 by NS and UDN 2954. The specifications 
of these two chips may not be what you want, but you should be able to find
 what you want  along this line.


Good luck.

 ==================================================================
Fenglei Du                        
Robotics Research Group         
Engineering Science Department          E mail:dflsun@uk.ac.oxford.robots
Oxford University                          Tel:+44-865-273125 
Oxford OX1 3PJ                             Fax:+44-865-273908
==================================================================


-- 
==================================================================
Fenglei Du                        |   |
Robotics Research Group         --+- -+-
Engineering Science Department   /|\  |    Tel:+44-865-273125(work)
