Timeline for Why did my LED drivers blow up?
Current License: CC BY-SA 4.0
7 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jul 16, 2022 at 14:03 | comment | added | rdtsc | Suggest looking at other switching regulator datasheets which do have layout examples. Study those carefully, and apply that methodology to your design. | |
| Jul 8, 2022 at 22:46 | comment | added | TimWescott | As fat as you can make fit. Coming off of the driver with a thin trace then fattening it up is a done thing, too. | |
| Jul 8, 2022 at 1:57 | comment | added | Reid | Any thoughts on how fat is fat enough? It's looking like 2mm is about the limit, and even so I'm having to do 1mm for the traces connected directly to the driver's pads. | |
| Jul 7, 2022 at 23:51 | comment | added | TimWescott | You want fat traces to bring the inductance down, too. | |
| Jul 7, 2022 at 20:27 | comment | added | Reid | Thanks! The drivers are supplying 1A, which (from a thermal standpoint) is easily handled by my trace widths according to IPC-2152. Maybe I'm just dumb (remember, I'm a mechanical engineer), but wouldn't the RMS current just be the set point of the drivers? I really tried to make the LED +/- leads as short as possible, but it was a real struggle to get it even as good as it is in this design without having a million vias. Maybe smaller inductors would let me squeeze everything tighter. | |
| Jul 7, 2022 at 19:51 | history | edited | TimWescott | CC BY-SA 4.0 |
Add suggestion to get a better-documented chip.
|
| Jul 7, 2022 at 19:22 | history | answered | TimWescott | CC BY-SA 4.0 |