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Sonsivri > Electronics > General Electronics (Moderators: o2, pickit2) > LED boost driver PCB layout topology
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Signal
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« on: May 08, 2020, 08:22:48 20:22 »
Small power LED boost driver FAN5333 to power 3 diodes from 2 cells.
https://www.onsemi.com/pub/Collateral/FAN5333B-D.pdf
SOT23-5, SOD-323, 2020(5050), 0805(2012)



Any comments are welcome.
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pickit2
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« Reply #1 on: May 08, 2020, 09:34:44 21:34 »
I like 1A less clutter
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vern
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« Reply #2 on: May 09, 2020, 09:06:03 21:06 »
I like 2 better, because PIN5 goes first to CIN and then to L. Better EMI.
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millegps
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« Reply #3 on: May 09, 2020, 10:17:55 22:17 »
You can consider also polygon pour*:




* like first layout
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comlekciler
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Ph.D.
« Reply #4 on: May 10, 2020, 12:55:34 12:55 »
The closest PCB track is better. I think, 1 (one) is fine.
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« Reply #5 on: May 11, 2020, 03:43:41 15:43 »
Quote from: millegps on May 09, 2020, 10:17:55 22:17
You can consider also polygon pour*:
Disagree. What I consider bad here: More copper area connected to and around SW pin, thermal reliefs and pin 4 supposed to be used.
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