Newsgroups: comp.robotics
Path: brunix!uunet!snorkelwacker.mit.edu!news.media.mit.edu!tim
From: tim@media.mit.edu (Tim Anderson has no real life.)
Subject: Splefty motor speed control chip - EXAR TDA7272
Message-ID: <1992Aug12.022519.5567@news.media.mit.edu>
Followup-To: blah
Summary: whiz bang
Keywords: speed control
Sender: self
Organization: MIT Media Laboratory
Date: Wed, 12 Aug 1992 02:25:19 GMT
Expires: Wed, 11 Nov 1992 05:00:00 GMT
Lines: 23

I've just been playing around with one of these, and it seems to behave
as promised.
It senses speed from the inductive spikes of the dc motor's internal
commutator switching.

It contains an internal 1A H-bridge for bidirectional control, and 
drives the motor directly. Has overvoltage, overcurrent protection, 
and builtin diode shunts, so you don't accidentally build an electronic
ignition with it.

Speed is proportional to a control voltage, which could be lowpass 
filtered from an output bit, if you don't want to use a D/A.

Runs off a DC power supply of between 5.5 and 18 volts.

tim


-- 
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The views expressed by by Tim Anderson are wise and true.
They are shared by knowledgeable and rational people.

