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Is the current limit on the TI LM3466 per parallel string of diodes or is this the maximum for the current source?

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  • \$\begingroup\$ The current rating is per parallel string. See the datasheet TI LM3466, pages 8 and 13 \$\endgroup\$ – bigFin Jan 19 '18 at 18:48
  • \$\begingroup\$ What if the Current source is say 5A and this exceeds the LM3466 limit of 1.5A and there are 5 sinks each designed for 1A. Wont the LM3466's overheat from excess voltage drop if the Sinks only add up to 4.9A as the Source rises to try to operate at 5A? \$\endgroup\$ – Tony Stewart Sunnyskyguy EE75 Jan 19 '18 at 19:10
  • \$\begingroup\$ @TonyStewart.EEsince'75 I think the 5x LM3466 ICs will share the 100mA. At 1000 + 20 mA per channel, 480 mA of overhead remains on each IC. Is this correct? \$\endgroup\$ – bigFin Jan 24 '18 at 20:45
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Per parallel string. See page 13 for the circuit topology.

www.ti.com/lit/ds/symlink/lm3466.pdf

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  • \$\begingroup\$ TY, I'd upvote you if I had enough rep points! \$\endgroup\$ – bigFin Jan 19 '18 at 18:34
  • \$\begingroup\$ No worries. You can mark it as answered though \$\endgroup\$ – pgvoorhees Jan 19 '18 at 18:35
  • \$\begingroup\$ Page 13 of what? \$\endgroup\$ – Finbarr Jan 19 '18 at 18:44
  • \$\begingroup\$ The linked datasheet... \$\endgroup\$ – bigFin Jan 24 '18 at 20:39
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looks like 1.5A max on one string, but I probably go about half that for cooling dissipation if you are going to operate it for long periods of time. enter image description here

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