Can I parallel LT1763 to double the current? - diyAudio
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Old 6th May 2010, 10:36 AM   #1
Kuro is offline Kuro  Hong Kong
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Default Can I parallel LT1763 to double the current?

I'm thinking about using the LT1763 to power my circuit since it has low noise. However, my circuit requires 620mA, so the LT1763 itself is not able to provide. Is it possible or even a good idea at all to parallel 2 LT1763 so I get 1A of current out of this combo?
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Old 26th May 2010, 02:35 AM   #2
Kuro is offline Kuro  Hong Kong
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Old 26th May 2010, 04:37 AM   #3
jcx is online now jcx  United States
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if the input V isn't too noisey and variable and the load doesn't vary you can just add a shunt R or CCS "helper' to add current to the output - but generally regs don't pull down so the added current must be less than the minimum draw

more compelx is a current mirror that measures/copies the I drawn by the single LT reg and adds it to the output for double the output - it will require >.6 V headroom

generally you can't simply parallel high feedback amplifier outputs without adding series R - which defeats the load regulation

Last edited by jcx; 26th May 2010 at 04:40 AM.
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Old 26th May 2010, 06:16 AM   #4
T in AZ is offline T in AZ  United States
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http://calradio.calit2.net/CalRadio1...s/LT1763fa.pdf
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