Electrical Engineering - relay bias currents

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relay bias currents

David

2007-07-26, 9:25 pm

Why would a relay have bias currents such as this:
http://www.teledynerelays.com/pdf/military/ca.pdf. Does it have something
to do with operating it in open-collector mode?

Thanks,

David.

krw

2007-07-27, 3:25 am

In article <puOdnba--No0zDTbnZ2dnUVZ_gydnZ2d@comcast.com>,
davidd31415@yoowhoo.com says...
> Why would a relay have bias currents such as this:
> http://www.teledynerelays.com/pdf/military/ca.pdf. Does it have something
> to do with operating it in open-collector mode?

Are you asking why it has a BIAS pin or why the current is what is
is?

The relay is controlled by a CMOS level. The control input switches
current in the BIAS pin to drive an LED (apparently) in the optical
isolator. The BIAS input looks like a current sink so is a constant
12ish MA above 5V.

Or are you asking something else?

--
Keith

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