Article View: sci.electronics.components
Article #153Re: Best way to power array of LEDs?
From: Winfield Hill
Date: Tue, 05 Nov 2002 03:48
Date: Tue, 05 Nov 2002 03:48
251 lines
16390 bytes
16390 bytes
ehsjr@bellatlantic.net wrote...
>
>Winfield Hill wrote:
>
>> I was taught to make efficient designs by insuring every part
>> has a purpose and carries its own weight. With that in mind,
>> here's my entry, a slim 32-channel adjustable current source.
>
> Where's the remote current sensing/ individual current
> auto-adjusting circuit for each LED?
Oh, sorry, I've fixed it now.
. 12V etc 4.7k 68 2W gnd
. ,---/\/\-----+--- E C --/\/\----+------------,
. | | B | |
. | LM385-1.2 B | 3.3k | | Vref
. +---|>]--- E C ---x----/\/\-----+ _ | |
. | | ,--------|--o /+|---+ |
. | ,----|----/\/\---|--------|---+-< | | |
. | | B LED | | | \-|-+-|--/\/\--+
. +--/\/\-+- E C ---|>|--+--/\/\--+ === | | |
. | | PD ,-|<|---------+ | | | |
. | | '-------------|---+------' | |
. | | | _ | |
. | | ,--------|--o /+|---+ |
. | ,----|----/\/\---|--------|---+-< | | |
. | | B LED | | | \-|-+-|--/\/\--+
. +--/\/\-+- E C ---|>|--+--/\/\--+ === | | |
. | | PD ,-|<|---------+ | | | |
. | | '-------------|---+------' | |
. | | | _ | |
. | | ,--------|--o /+|---+ |
. | ,----|----/\/\---|--------|---+-< | | |
. | | B LED | | | \-|-+-|--/\/\--+
. +--/\/\-+- E C ---|>|--+--/\/\--+ === | | |
. | | PD ,-|<|---------+ | | | |
. | | '-------------|---+------' | |
. | | | _ | |
. | | ,--------|--o /+|---+ |
. | ,----|----/\/\---|--------|---+-< | | |
. | | B LED | | | \-|-+-|--/\/\--+
. +--/\/\-+- E C ---|>|--+--/\/\--+ === | | |
. | | PD ,-|<|---------+ | | | |
. | | '-------------|---+------' | |
. | | | _ | |
. | | ,--------|--o /+|---+ |
. | ,----|----/\/\---|--------|---+-< | | |
. | | B LED | | | \-|-+-|--/\/\--+
. +--/\/\-+- E C ---|>|--+--/\/\--+ === | | |
. | | PD ,-|<|---------+ | | | |
. | | '-------------|---+------' | |
. | | | _ | |
. | | ,--------|--o /+|---+ |
. | ,----|----/\/\---|--------|---+-< | | |
. | | B LED | | | \-|-+-|--/\/\--+
. +--/\/\-+- E C ---|>|--+--/\/\--+ === | | |
. | | PD ,-|<|---------+ | | | |
. | | '-------------|---+------' | |
. | | | _ | |
. | | ,--------|--o /+|---+ |
. | ,----|----/\/\---|--------|---+-< | | |
. | | B LED | | | \-|-+-|--/\/\--+
. +--/\/\-+- E C ---|>|--+--/\/\--+ === | | |
. | | PD ,-|<|---------+ | | | |
. | | '-------------|---+------' | |
. | | | _ | |
. | | ,--------|--o /+|---+ |
. | ,----|----/\/\---|--------|---+-< | | |
. | | B LED | | | \-|-+-|--/\/\--+
. +--/\/\-+- E C ---|>|--+--/\/\--+ === | | |
. | | PD ,-|<|---------+ | | | |
. | | '-------------|---+------' | |
. | | | _ | |
. | | ,--------|--o /+|---+ |
. | ,----|----/\/\---|--------|---+-< | | |
. | | B LED | | | \-|-+-|--/\/\--+
. +--/\/\-+- E C ---|>|--+--/\/\--+ === | | |
. | | PD ,-|<|---------+ | | | |
. | | '-------------|---+------' | |
. | | | _ | |
. | | ,--------|--o /+|---+ |
. | ,----|----/\/\---|--------|---+-< | | |
. | | B LED | | | \-|-+-|--/\/\--+
. +--/\/\-+- E C ---|>|--+--/\/\--+ === | | |
. | | PD ,-|<|---------+ | | | |
. | | '-------------|---+------' | |
. | | | _ | |
. | | ,--------|--o /+|---+ |
. | ,----|----/\/\---|--------|---+-< | | |
. | | B LED | | | \-|-+-|--/\/\--+
. +--/\/\-+- E C ---|>|--+--/\/\--+ === | | |
. | | PD ,-|<|---------+ | | | |
. | | '-------------|---+------' | |
. | | | _ | |
. | | ,--------|--o /+|---+ |
. | ,----|----/\/\---|--------|---+-< | | |
. | | B LED | | | \-|-+-|--/\/\--+
. +--/\/\-+- E C ---|>|--+--/\/\--+ === | | |
. | | PD ,-|<|---------+ | | | |
. | | '-------------|---+------' | |
. | | | _ | |
. | | ,--------|--o /+|---+ |
. | ,----|----/\/\---|--------|---+-< | | |
. | | B LED | | | \-|-+-|--/\/\--+
. +--/\/\-+- E C ---|>|--+--/\/\--+ === | | |
. | | PD ,-|<|---------+ | | | |
. | | '-------------|---+------' | |
. | | | _ | |
. | | ,--------|--o /+|---+ |
. | ,----|----/\/\---|--------|---+-< | | |
. | | B LED | | | \-|-+-|--/\/\--+
. +--/\/\-+- E C ---|>|--+--/\/\--+ === | | |
. | | PD ,-|<|---------+ | | | |
. | | '-------------|---+------' | |
. | | | _ | |
. | | ,--------|--o /+|---+ |
. | ,----|----/\/\---|--------|---+-< | | |
. | | B LED | | | \-|-+-|--/\/\--+
. +--/\/\-+- E C ---|>|--+--/\/\--+ === | | |
. | | PD ,-|<|---------+ | | | |
. | | '-------------|---+------' | |
. | | | _ | |
. | | ,--------|--o /+|---+ |
. | ,----|----/\/\---|--------|---+-< | | |
. | | B LED | | | \-|-+-|--/\/\--+
. +--/\/\-+- E C ---|>|--+--/\/\--+ === | | |
. | | PD ,-|<|---------+ | | | |
. | | '-------------|---+------' | |
. | | | _ | |
. | | ,--------|--o /+|---+ |
. | ,----|----/\/\---|--------|---+-< | | |
. | | B LED | | | \-|-+-|--/\/\--+
. +--/\/\-+- E C ---|>|--+--/\/\--+ === | | |
. | | PD ,-|<|---------+ | | | |
. | | '-------------|---+------' | |
. | | | _ | |
. | | ,--------|--o /+|---+ |
. | ,----|----/\/\---|--------|---+-< | | |
. | | B LED | | | \-|-+-|--/\/\--+
. +--/\/\-+- E C ---|>|--+--/\/\--+ === | | |
. | | PD ,-|<|---------+ | | | |
. | | '-------------|---+------' | |
. | | | _ | |
. | | ,--------|--o /+|---+ |
. | ,----|----/\/\---|--------|---+-< | | |
. | | B LED | | | \-|-+-|--/\/\--+
. +--/\/\-+- E C ---|>|--+--/\/\--+ === | | |
. | | PD ,-|<|---------+ | | | |
. | | '-------------|---+------' | |
. | | | _ | |
. | | ,--------|--o /+|---+ |
. | ,----|----/\/\---|--------|---+-< | | |
. | | B LED | | | \-|-+-|--/\/\--+
. +--/\/\-+- E C ---|>|--+--/\/\--+ === | | |
. | | PD ,-|<|---------+ | | | |
. | | '-------------|---+------' | |
. | | | _ | |
. | | ,--------|--o /+|---+ |
. | ,----|----/\/\---|--------|---+-< | | |
. | | B LED | | | \-|-+-|--/\/\--+
. +--/\/\-+- E C ---|>|--+--/\/\--+ === | | |
. | | PD ,-|<|---------+ | | | |
. | | '-------------|---+------' | |
. | | | _ | |
. | | ,--------|--o /+|---+ |
. | ,----|----/\/\---|--------|---+-< | | |
. | | B LED | | | \-|-+-|--/\/\--+
. +--/\/\-+- E C ---|>|--+--/\/\--+ === | | |
. | | PD ,-|<|---------+ | | | |
. | | '-------------|---+------' | |
. | | | _ | |
. | | ,--------|--o /+|---+ |
. | ,----|----/\/\---|--------|---+-< | | |
. | | B LED | | | \-|-+-|--/\/\--+
. +--/\/\-+- E C ---|>|--+--/\/\--+ === | | |
. | | PD ,-|<|---------+ | | | |
. | | '-------------|---+------' | |
. | | | _ | |
. | | ,--------|--o /+|---+ |
. | ,----|----/\/\---|--------|---+-< | | |
. | | B LED | | | \-|-+-|--/\/\--+
. +--/\/\-+- E C ---|>|--+--/\/\--+ === | | |
. | | PD ,-|<|---------+ | | | |
. | | '-------------|---+------' | |
. | | | _ | |
. | | ,--------|--o /+|---+ |
. | ,----|----/\/\---|--------|---+-< | | |
. | | B LED | | | \-|-+-|--/\/\--+
. +--/\/\-+- E C ---|>|--+--/\/\--+ === | | |
. | | PD ,-|<|---------+ | | | |
. | | '-------------|---+------' | |
. | | | _ | |
. | | ,--------|--o /+|---+ |
. | ,----|----/\/\---|--------|---+-< | | |
. | | B LED | | | \-|-+-|--/\/\--+
. +--/\/\-+- E C ---|>|--+--/\/\--+ === | | |
. | | PD ,-|<|---------+ | | | |
. | | '-------------|---+------' | |
. | | | _ | |
. | | ,--------|--o /+|---+ |
. | ,----|----/\/\---|--------|---+-< | | |
. | | B LED | | | \-|-+-|--/\/\--+
. +--/\/\-+- E C ---|>|--+--/\/\--+ === | | |
. | | PD ,-|<|---------+ | | | |
. | | '-------------|---+------' | |
. | | | _ | |
. | | ,--------|--o /+|---+ |
. | ,----|----/\/\---|--------|---+-< | | |
. | | B LED | | | \-|-+-|--/\/\--+
. +--/\/\-+- E C ---|>|--+--/\/\--+ === | | |
. | | PD ,-|<|---------+ | | | |
. | | '-------------|---+------' | |
. | | | _ | |
. | | ,--------|--o /+|---+ |
. | ,----|----/\/\---|--------|---+-< | | |
. | | B LED | | | \-|-+-|--/\/\--+
. +--/\/\-+- E C ---|>|--+--/\/\--+ === | | |
. | | PD ,-|<|---------+ | | | |
. | | '-------------|---+------' | |
. | | | _ | |
. | | ,--------|--o /+|---+ |
. | ,----|----/\/\---|--------|---+-< | | |
. | | B LED | | | \-|-+-|--/\/\--+
. +--/\/\-+- E C ---|>|--+--/\/\--+ === | | |
. | | PD ,-|<|---------+ | | | |
. | | '-------------|---+------' | |
. | | | _ | |
. | | ,--------|--o /+|---+ |
. | ,----|----/\/\---|--------|---+-< | | |
. | | B LED | | | \-|-+-|--/\/\--+
. +--/\/\-+- E C ---|>|--+--/\/\--+ === | | |
. | | PD ,-|<|---------+ | | | |
. | | '-------------|---+------' | |
. | | | _ | |
. | | ,--------|--o /+|---+ |
. | ,----|----/\/\---|--------|---+-< | | |
. | | B LED | | | \-|-+-|--/\/\--+
. +--/\/\-+- E C ---|>|--+--/\/\--+ === | | |
. | | PD ,-|<|---------+ | | | |
. | | '-------------|---+------' | |
. | | | _ | |
. | | ,--------|--o /+|---' |
. | ,----|----/\/\---|--------|---+-< | |
. | | B LED | | | \-|-+----/\/\--'
. '--/\/\-+- E C ---|>|--+--/\/\--+ === |
. PD ,-|<|---------' | |
. '-----------------+------'
Thanks,
- Win
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