>-----Original Message-----
>From: At van Wijk [mailto:atelec@WXS.NL]
>Sent: 25 June 2004 12:31
>To: PICLIST@MITVMA.MIT.EDU
>Subject: Re: [EE:] Current sharing resistors
>
>
>> Without going down the whole reverse engineering, desgn calculation
>> path, does someone have a simple, rule of thumb value for emitter
>> resistors to promote current sharing in parallel'ed bipolar
>> transistors ?
>
>> Now that I actually need 5A  .. //..    have 2 2N3055's in
>parallel ..
>
>Hello Steve,
>
>Take 1 ohm 5Watt resistors. That was always standard practice
>for me. You can find resistive wire in heating elements or
>just take thin copper wire (of the right length) if you don't
>have that kind of resistors.
>
>At van Wijk.

1 Ohm is way too high for high curent applications.  That's a 2.5volt drop
at maximum load in the OP application which could seriously eat into your
voltage overhead.  The resistors would also dissipate 6.25Watts each, so
would have to be 10Watt parts at a minimum.  0.047 Ohm would be my first
choice, at a push 0.1 Ohm as I'm more likely to have them in the junkbox.

Regards

Mike




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