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mission:resources:picouvx [2013/06/06 10:14] – [Repository] chrono | mission:resources:picouvx [2016/03/18 08:37] – [BOM] chrono | ||
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|MTBF| > 100.000H | | |MTBF| > 100.000H | | ||
- | <WRAP round warning> | + | <WRAP round alert> |
The emitter-array' | The emitter-array' | ||
</ | </ | ||
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Using this many LED's in a current controlled environment and a 12V power supply usually tends to result in a higher BOM count since a serial configuration will only power 3-4 LED's per chain. One alternative would be to use a parallel configuration, | Using this many LED's in a current controlled environment and a 12V power supply usually tends to result in a higher BOM count since a serial configuration will only power 3-4 LED's per chain. One alternative would be to use a parallel configuration, | ||
- | The most efficient solution seemed to be a switch-mode step-up voltage converter, transforming 12V DC up to 42V DC, which makes a serial configuration of up to 11 LED's per chain possible. This design is based on the widely available MC34063 switch-mode controller IC you can even rip off at electronic trash sites, since it's cheap and a very popular controller in chinese electronics. | + | The most efficient solution seemed to be a switch-mode step-up |
==== Specs ==== | ==== Specs ==== | ||
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|Q1| BC328 | PNP Transistor | |Q1| BC328 | PNP Transistor | ||
|Q2| IRLIZ44N | |Q2| IRLIZ44N | ||
+ | |||
+ | **Increasing Efficiency** | ||
+ | |||
+ | The trick to get more than 90% efficiency out of the MC34063 seems to be a very high Q inductor (L1). At first L1 was wound on a yellow/ | ||
===== Controller ===== | ===== Controller ===== | ||
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<WRAP round download> | <WRAP round download> | ||
- | * **Anonymous GIT Pull**: git clone [[git:// | + | **Anonymous GIT Pull**\\ |
+ | git clone [[git:// | ||
</ | </ | ||
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{{tag> | {{tag> | ||
- | {{keywords> | + | {{keywords> |
~~DISCUSSION~~ | ~~DISCUSSION~~ |