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Original question:

LM3481: MOSFET Heating

LM3481: Diode Burnout

Noel Binny Abraham
Intellectual 370 points
Part Number: LM3481

Hi team

So i've been using the LM3481 for a sepic converter for a while and i have had problems with the board (Please refer to the previous thread: https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1257300/lm3481-mosfet-heating/4846543#4846543)

Right now, when i was testing a few new boards im running into new issues.
The board  is having the following configuration:
Vin: 7S Li-ion (20V to 30V)
Vout: 24V/1A.

I was testing the board at a load of 0.5A when i started encoutering the issue. The board was running fine for around 2mins during testing and later on the voltage at the output dropped off to 0V and it kept trying to restart. During this restart attempt the board kept losing output regulation and after a while the diode shorted out and i ended up having a board with VOUT and GND dead short. Replaced the diode and did the same test and i again ended up shorting the diode. This kept happening and this behaviour was observed on multiple boards. Can somebody please help me figure out why this might be happening? I can share my PCB files and schematic on private chat for a review. 

(Please note: At a load of 0.5A, the inductor heats upto about 77 deg.C (which is around 46 deg.C above ambient.))

Im attaching a text file for the the testing values:

LM3481 Test report_24V_0.5A.txt 
2/1/2024 12:04:57 PM	24.132V	0.0000A
2/1/2024 12:04:57 PM	24.132V	0.0000A
2/1/2024 12:04:58 PM	24.131V	0.0000A
2/1/2024 12:04:58 PM	24.130V	0.0000A
2/1/2024 12:04:59 PM	24.132V	0.0000A
2/1/2024 12:04:59 PM	24.040V	0.1930A
2/1/2024 12:05:00 PM	24.046V	0.4991A
2/1/2024 12:05:00 PM	24.049V	0.4988A
2/1/2024 12:05:01 PM	24.052V	0.4988A
2/1/2024 12:05:01 PM	24.055V	0.4988A
2/1/2024 12:05:02 PM	24.056V	0.4988A
2/1/2024 12:05:02 PM	24.055V	0.4988A
2/1/2024 12:05:03 PM	24.057V	0.4988A
2/1/2024 12:05:03 PM	24.060V	0.4988A
2/1/2024 12:05:04 PM	24.060V	0.4988A
2/1/2024 12:05:05 PM	24.060V	0.4988A
2/1/2024 12:05:05 PM	24.061V	0.4988A
2/1/2024 12:05:06 PM	24.062V	0.4988A
2/1/2024 12:05:06 PM	24.063V	0.4988A
2/1/2024 12:05:07 PM	24.058V	0.4988A
2/1/2024 12:05:07 PM	24.057V	0.4988A
2/1/2024 12:05:08 PM	24.059V	0.4988A
2/1/2024 12:05:08 PM	24.059V	0.4988A
2/1/2024 12:05:09 PM	24.064V	0.4988A
2/1/2024 12:05:09 PM	24.064V	0.4988A
2/1/2024 12:05:10 PM	24.064V	0.4991A
2/1/2024 12:05:10 PM	24.065V	0.4988A
2/1/2024 12:05:11 PM	24.065V	0.4988A
2/1/2024 12:05:11 PM	24.066V	0.4988A
2/1/2024 12:05:12 PM	24.067V	0.4988A
2/1/2024 12:05:12 PM	24.069V	0.4988A
2/1/2024 12:05:13 PM	24.069V	0.4988A
2/1/2024 12:05:14 PM	24.070V	0.4988A
2/1/2024 12:05:14 PM	24.071V	0.4991A
2/1/2024 12:05:15 PM	24.071V	0.4988A
2/1/2024 12:05:15 PM	24.073V	0.4988A
2/1/2024 12:05:16 PM	24.073V	0.4991A
2/1/2024 12:05:16 PM	24.077V	0.4988A
2/1/2024 12:05:17 PM	24.083V	0.4988A
2/1/2024 12:05:17 PM	24.080V	0.4988A
2/1/2024 12:05:18 PM	24.084V	0.4988A
2/1/2024 12:05:18 PM	24.087V	0.4988A
2/1/2024 12:05:19 PM	24.087V	0.4991A
2/1/2024 12:05:19 PM	24.088V	0.4988A
2/1/2024 12:05:20 PM	24.088V	0.4988A
2/1/2024 12:05:20 PM	24.088V	0.4991A
2/1/2024 12:05:21 PM	24.088V	0.4988A
2/1/2024 12:05:21 PM	24.084V	0.4988A
2/1/2024 12:05:22 PM	24.082V	0.4988A
2/1/2024 12:05:23 PM	24.082V	0.4988A
2/1/2024 12:05:23 PM	24.079V	0.4988A
2/1/2024 12:05:24 PM	24.085V	0.4991A
2/1/2024 12:05:24 PM	24.087V	0.4988A
2/1/2024 12:05:25 PM	24.088V	0.4988A
2/1/2024 12:05:25 PM	24.089V	0.4988A
2/1/2024 12:05:26 PM	24.090V	0.4988A
2/1/2024 12:05:26 PM	24.088V	0.4991A
2/1/2024 12:05:27 PM	24.084V	0.4988A
2/1/2024 12:05:27 PM	24.086V	0.4988A
2/1/2024 12:05:28 PM	24.083V	0.4988A
2/1/2024 12:05:28 PM	24.082V	0.4988A
2/1/2024 12:05:29 PM	24.087V	0.4988A
2/1/2024 12:05:29 PM	24.087V	0.4988A
2/1/2024 12:05:30 PM	24.087V	0.4988A
2/1/2024 12:05:30 PM	24.087V	0.4988A
2/1/2024 12:05:31 PM	24.088V	0.4988A
2/1/2024 12:05:32 PM	24.087V	0.4988A
2/1/2024 12:05:32 PM	24.085V	0.4988A
2/1/2024 12:05:33 PM	24.079V	0.4988A
2/1/2024 12:05:33 PM	24.085V	0.4988A
2/1/2024 12:05:34 PM	24.088V	0.4991A
2/1/2024 12:05:34 PM	24.077V	0.4988A
2/1/2024 12:05:35 PM	24.072V	0.4988A
2/1/2024 12:05:35 PM	24.076V	0.4988A
2/1/2024 12:05:36 PM	24.076V	0.4988A
2/1/2024 12:05:36 PM	24.077V	0.4988A
2/1/2024 12:05:37 PM	24.079V	0.4988A
2/1/2024 12:05:37 PM	24.077V	0.4988A
2/1/2024 12:05:38 PM	24.080V	0.4988A
2/1/2024 12:05:38 PM	24.077V	0.4988A
2/1/2024 12:05:39 PM	24.080V	0.4988A
2/1/2024 12:05:39 PM	24.082V	0.4988A
2/1/2024 12:05:40 PM	24.082V	0.4988A
2/1/2024 12:05:40 PM	24.079V	0.4988A
2/1/2024 12:05:41 PM	24.077V	0.4988A
2/1/2024 12:05:42 PM	24.083V	0.4991A
2/1/2024 12:05:42 PM	24.082V	0.4991A
2/1/2024 12:05:43 PM	24.082V	0.4988A
2/1/2024 12:05:43 PM	24.082V	0.4988A
2/1/2024 12:05:44 PM	24.080V	0.4988A
2/1/2024 12:05:44 PM	24.078V	0.4988A
2/1/2024 12:05:45 PM	24.077V	0.4988A
2/1/2024 12:05:45 PM	24.079V	0.4988A
2/1/2024 12:05:46 PM	24.078V	0.4988A
2/1/2024 12:05:46 PM	24.080V	0.4988A
2/1/2024 12:05:47 PM	24.072V	0.4988A
2/1/2024 12:05:47 PM	24.070V	0.4988A
2/1/2024 12:05:48 PM	24.069V	0.4988A
2/1/2024 12:05:48 PM	24.067V	0.4988A
2/1/2024 12:05:49 PM	24.066V	0.4988A
2/1/2024 12:05:49 PM	24.066V	0.4988A
2/1/2024 12:05:50 PM	24.072V	0.4988A
2/1/2024 12:05:50 PM	24.072V	0.4988A
2/1/2024 12:05:51 PM	24.068V	0.4988A
2/1/2024 12:05:52 PM	24.068V	0.4988A
2/1/2024 12:05:52 PM	24.071V	0.4988A
2/1/2024 12:05:53 PM	24.069V	0.4988A
2/1/2024 12:05:53 PM	24.067V	0.4988A
2/1/2024 12:05:54 PM	24.063V	0.4988A
2/1/2024 12:05:54 PM	24.062V	0.4988A
2/1/2024 12:05:55 PM	24.058V	0.4988A
2/1/2024 12:05:55 PM	24.059V	0.4988A
2/1/2024 12:05:56 PM	24.062V	0.4988A
2/1/2024 12:05:56 PM	24.066V	0.4988A
2/1/2024 12:05:57 PM	24.055V	0.4988A
2/1/2024 12:05:57 PM	24.040V	0.4988A
2/1/2024 12:05:58 PM	24.045V	0.4988A
2/1/2024 12:05:58 PM	24.060V	0.4988A
2/1/2024 12:05:59 PM	24.043V	0.4988A
2/1/2024 12:05:59 PM	24.068V	0.4988A
2/1/2024 12:06:00 PM	24.072V	0.4988A
2/1/2024 12:06:00 PM	24.062V	0.4988A
2/1/2024 12:06:01 PM	24.039V	0.4988A
2/1/2024 12:06:02 PM	24.039V	0.4988A
2/1/2024 12:06:02 PM	24.038V	0.4988A
2/1/2024 12:06:03 PM	24.042V	0.4988A
2/1/2024 12:06:03 PM	24.042V	0.4988A
2/1/2024 12:06:04 PM	24.038V	0.4988A
2/1/2024 12:06:04 PM	24.037V	0.4988A
2/1/2024 12:06:05 PM	23.986V	0.4988A
2/1/2024 12:06:05 PM	23.998V	0.4988A
2/1/2024 12:06:06 PM	24.033V	0.4988A
2/1/2024 12:06:06 PM	24.062V	0.4988A
2/1/2024 12:06:07 PM	24.051V	0.4988A
2/1/2024 12:06:07 PM	24.062V	0.4988A
2/1/2024 12:06:08 PM	24.064V	0.4988A
2/1/2024 12:06:08 PM	24.047V	0.4988A
2/1/2024 12:06:09 PM	24.051V	0.4988A
2/1/2024 12:06:09 PM	23.922V	0.4988A
2/1/2024 12:06:10 PM	24.052V	0.4988A
2/1/2024 12:06:10 PM	24.048V	0.4988A
2/1/2024 12:06:11 PM	23.863V	0.4988A
2/1/2024 12:06:12 PM	23.955V	0.4988A
2/1/2024 12:06:12 PM	23.974V	0.4988A
2/1/2024 12:06:13 PM	23.901V	0.4988A
2/1/2024 12:06:13 PM	23.886V	0.4988A
2/1/2024 12:06:14 PM	24.005V	0.4991A
2/1/2024 12:06:14 PM	23.945V	0.4988A
2/1/2024 12:06:15 PM	24.007V	0.4991A
2/1/2024 12:06:15 PM	23.919V	0.4988A
2/1/2024 12:06:16 PM	24.036V	0.4988A
2/1/2024 12:06:16 PM	24.027V	0.4988A
2/1/2024 12:06:17 PM	24.004V	0.4988A
2/1/2024 12:06:17 PM	24.035V	0.4988A
2/1/2024 12:06:18 PM	23.896V	0.4988A
2/1/2024 12:06:18 PM	24.009V	0.4988A
2/1/2024 12:06:19 PM	24.007V	0.4988A
2/1/2024 12:06:19 PM	23.980V	0.4988A
2/1/2024 12:06:20 PM	23.974V	0.4988A
2/1/2024 12:06:20 PM	24.002V	0.4988A
2/1/2024 12:06:21 PM	24.023V	0.4988A
2/1/2024 12:06:22 PM	24.028V	0.4988A
2/1/2024 12:06:22 PM	24.011V	0.4988A
2/1/2024 12:06:23 PM	24.037V	0.4988A
2/1/2024 12:06:23 PM	24.042V	0.4988A
2/1/2024 12:06:24 PM	24.056V	0.4988A
2/1/2024 12:06:24 PM	24.064V	0.4988A
2/1/2024 12:06:25 PM	24.068V	0.4988A
2/1/2024 12:06:25 PM	24.063V	0.4988A
2/1/2024 12:06:26 PM	24.042V	0.4988A
2/1/2024 12:06:26 PM	24.031V	0.4988A
2/1/2024 12:06:27 PM	24.055V	0.4988A
2/1/2024 12:06:27 PM	24.061V	0.4988A
2/1/2024 12:06:28 PM	24.051V	0.4988A
2/1/2024 12:06:28 PM	24.063V	0.4988A
2/1/2024 12:06:29 PM	24.061V	0.4988A
2/1/2024 12:06:29 PM	24.052V	0.4988A
2/1/2024 12:06:30 PM	24.065V	0.4988A
2/1/2024 12:06:31 PM	24.049V	0.4988A
2/1/2024 12:06:31 PM	24.065V	0.4988A
2/1/2024 12:06:32 PM	24.056V	0.4988A
2/1/2024 12:06:32 PM	24.057V	0.4988A
2/1/2024 12:06:33 PM	24.062V	0.4988A
2/1/2024 12:06:33 PM	24.065V	0.4988A
2/1/2024 12:06:34 PM	24.064V	0.4988A
2/1/2024 12:06:34 PM	24.061V	0.4988A
2/1/2024 12:06:35 PM	24.069V	0.4988A
2/1/2024 12:06:35 PM	24.066V	0.4988A
2/1/2024 12:06:36 PM	24.065V	0.4988A
2/1/2024 12:06:36 PM	24.053V	0.4988A
2/1/2024 12:06:37 PM	24.055V	0.4988A
2/1/2024 12:06:37 PM	24.054V	0.4988A
2/1/2024 12:06:38 PM	24.055V	0.4988A
2/1/2024 12:06:38 PM	24.049V	0.4988A
2/1/2024 12:06:39 PM	24.051V	0.4988A
2/1/2024 12:06:39 PM	24.050V	0.4988A
2/1/2024 12:06:40 PM	24.049V	0.4988A
2/1/2024 12:06:41 PM	24.048V	0.4988A
2/1/2024 12:06:41 PM	24.043V	0.4988A
2/1/2024 12:06:42 PM	24.038V	0.4988A
2/1/2024 12:06:42 PM	24.042V	0.4988A
2/1/2024 12:06:43 PM	24.034V	0.4988A
2/1/2024 12:06:43 PM	24.030V	0.4988A
2/1/2024 12:06:44 PM	24.030V	0.4988A
2/1/2024 12:06:44 PM	24.029V	0.4988A
2/1/2024 12:06:45 PM	24.003V	0.4988A
2/1/2024 12:06:45 PM	23.987V	0.4988A
2/1/2024 12:06:46 PM	23.967V	0.4991A
2/1/2024 12:06:46 PM	23.965V	0.4988A
2/1/2024 12:06:47 PM	23.945V	0.4988A
2/1/2024 12:06:47 PM	23.909V	0.4988A
2/1/2024 12:06:48 PM	23.889V	0.4988A
2/1/2024 12:06:48 PM	23.864V	0.4988A
2/1/2024 12:06:49 PM	23.862V	0.4991A
2/1/2024 12:06:49 PM	23.855V	0.4988A
2/1/2024 12:06:50 PM	23.836V	0.4988A
2/1/2024 12:06:51 PM	23.808V	0.4988A
2/1/2024 12:06:51 PM	23.790V	0.4988A
2/1/2024 12:06:52 PM	23.780V	0.4988A
2/1/2024 12:06:52 PM	23.721V	0.4988A
2/1/2024 12:06:53 PM	23.719V	0.4988A
2/1/2024 12:06:53 PM	23.706V	0.4988A
2/1/2024 12:06:54 PM	23.701V	0.4988A
2/1/2024 12:06:54 PM	23.694V	0.4991A
2/1/2024 12:06:55 PM	23.684V	0.4988A
2/1/2024 12:06:55 PM	23.634V	0.4988A
2/1/2024 12:06:56 PM	23.627V	0.4988A
2/1/2024 12:06:56 PM	23.614V	0.4988A
2/1/2024 12:06:57 PM	23.599V	0.4991A
2/1/2024 12:06:57 PM	23.542V	0.4988A
2/1/2024 12:06:58 PM	23.530V	0.4988A
2/1/2024 12:06:58 PM	23.514V	0.4988A
2/1/2024 12:06:59 PM	23.532V	0.4988A
2/1/2024 12:06:59 PM	23.498V	0.4991A
2/1/2024 12:07:00 PM	23.481V	0.4988A
2/1/2024 12:07:01 PM	23.491V	0.4988A
2/1/2024 12:07:01 PM	23.492V	0.4988A
2/1/2024 12:07:02 PM	23.493V	0.4988A
2/1/2024 12:07:02 PM	23.494V	0.4988A
2/1/2024 12:07:03 PM	23.495V	0.4988A
2/1/2024 12:07:03 PM	23.492V	0.4988A
2/1/2024 12:07:04 PM	23.482V	0.4988A
2/1/2024 12:07:04 PM	23.465V	0.4988A
2/1/2024 12:07:05 PM	23.458V	0.4988A
2/1/2024 12:07:05 PM	23.452V	0.4988A
2/1/2024 12:07:06 PM	23.424V	0.4988A
2/1/2024 12:07:06 PM	23.418V	0.4988A
2/1/2024 12:07:07 PM	23.412V	0.4988A
2/1/2024 12:07:07 PM	23.405V	0.4988A
2/1/2024 12:07:08 PM	23.403V	0.4988A
2/1/2024 12:07:08 PM	23.403V	0.4988A
2/1/2024 12:07:09 PM	23.400V	0.4988A
2/1/2024 12:07:10 PM	23.397V	0.4988A
2/1/2024 12:07:10 PM	23.394V	0.4988A
2/1/2024 12:07:11 PM	23.389V	0.4988A
2/1/2024 12:07:11 PM	23.393V	0.4988A
2/1/2024 12:07:12 PM	23.390V	0.4991A
2/1/2024 12:07:12 PM	23.383V	0.4988A
2/1/2024 12:07:13 PM	23.380V	0.4988A
2/1/2024 12:07:13 PM	23.380V	0.4988A
2/1/2024 12:07:14 PM	23.388V	0.4988A
2/1/2024 12:07:14 PM	23.396V	0.4988A
2/1/2024 12:07:15 PM	23.394V	0.4988A
2/1/2024 12:07:15 PM	23.384V	0.4988A
2/1/2024 12:07:16 PM	23.381V	0.4988A
2/1/2024 12:07:16 PM	23.378V	0.4991A
2/1/2024 12:07:17 PM	23.379V	0.4988A
2/1/2024 12:07:17 PM	23.364V	0.4988A
2/1/2024 12:07:18 PM	23.349V	0.4988A
2/1/2024 12:07:18 PM	23.318V	0.4988A
2/1/2024 12:07:19 PM	23.309V	0.4988A
2/1/2024 12:07:20 PM	23.305V	0.4988A
2/1/2024 12:07:20 PM	0.0000V	0.4988A
2/1/2024 12:07:21 PM	23.288V	0.4988A
2/1/2024 12:07:21 PM	0.0000V	0.0010A
2/1/2024 12:07:22 PM	0.0000V	0.4991A
2/1/2024 12:07:22 PM	0.3310V	0.4988A
2/1/2024 12:07:23 PM	0.3310V	0.1405A
2/1/2024 12:07:23 PM	0.3310V	0.1405A
2/1/2024 12:07:24 PM	0.3310V	0.1405A
2/1/2024 12:07:24 PM	23.334V	0.4991A
2/1/2024 12:07:25 PM	0.0000V	0.0025A
2/1/2024 12:07:25 PM	23.345V	0.4991A
2/1/2024 12:07:26 PM	0.0000V	0.0020A
2/1/2024 12:07:26 PM	23.340V	0.0957A
2/1/2024 12:07:27 PM	1.0293V	0.0957A
2/1/2024 12:07:27 PM	1.0293V	0.0957A
2/1/2024 12:07:28 PM	1.0293V	0.4991A
2/1/2024 12:07:28 PM	0.0368V	0.0303A
2/1/2024 12:07:29 PM	23.325V	0.4991A
2/1/2024 12:07:30 PM	23.294V	0.4988A
2/1/2024 12:07:30 PM	23.294V	0.0743A
2/1/2024 12:07:31 PM	0.2352V	0.1760A
2/1/2024 12:07:31 PM	0.0262V	0.4991A
2/1/2024 12:07:32 PM	1.1926V	0.3081A
2/1/2024 12:07:32 PM	0.4986V	0.1171A
2/1/2024 12:07:33 PM	23.359V	0.1171A
2/1/2024 12:07:33 PM	0.1996V	0.0556A
2/1/2024 12:07:34 PM	0.1996V	0.0556A
2/1/2024 12:07:34 PM	0.3153V	0.1704A
2/1/2024 12:07:35 PM	23.352V	0.4991A
2/1/2024 12:07:35 PM	1.1956V	0.1935A
2/1/2024 12:07:36 PM	1.1956V	0.4991A
2/1/2024 12:07:36 PM	0.5002V	0.4991A
2/1/2024 12:07:37 PM	0.5002V	0.1917A
2/1/2024 12:07:37 PM	23.345V	0.4991A
2/1/2024 12:07:38 PM	0.2568V	0.3127A
2/1/2024 12:07:38 PM	0.4346V	0.1248A
2/1/2024 12:07:39 PM	23.792V	0.0000A
2/1/2024 12:07:40 PM	23.974V	0.0000A
2/1/2024 12:07:40 PM	24.728V	0.0000A
2/1/2024 12:07:41 PM	24.328V	0.0000A
2/1/2024 12:07:41 PM	23.715V	0.0000A
2/1/2024 12:07:42 PM	23.408V	0.0000A
2/1/2024 12:07:42 PM	24.023V	0.0000A
2/1/2024 12:07:43 PM	23.434V	0.0000A
2/1/2024 12:07:43 PM	23.107V	0.0000A
2/1/2024 12:07:44 PM	23.436V	0.0000A
2/1/2024 12:07:44 PM	25.525V	0.0000A
2/1/2024 12:07:45 PM	24.027V	0.0000A
2/1/2024 12:07:45 PM	23.959V	0.0000A
2/1/2024 12:07:46 PM	24.510V	0.0000A
2/1/2024 12:07:46 PM	23.389V	0.0000A
2/1/2024 12:07:47 PM	23.455V	0.0000A
2/1/2024 12:07:47 PM	22.819V	0.0000A
2/1/2024 12:07:48 PM	23.710V	0.0000A
2/1/2024 12:07:49 PM	23.457V	0.0000A
2/1/2024 12:07:49 PM	23.306V	0.0000A
2/1/2024 12:07:50 PM	24.873V	0.0000A
2/1/2024 12:07:50 PM	23.632V	0.0000A
2/1/2024 12:07:51 PM	24.063V	0.0000A
2/1/2024 12:07:51 PM	24.335V	0.0000A
2/1/2024 12:07:52 PM	24.035V	0.0000A
2/1/2024 12:07:52 PM	24.830V	0.0000A
2/1/2024 12:07:53 PM	22.706V	0.0000A
2/1/2024 12:07:53 PM	23.503V	0.0000A
2/1/2024 12:07:54 PM	24.466V	0.0000A
2/1/2024 12:07:54 PM	24.546V	0.0000A
2/1/2024 12:07:55 PM	24.124V	0.0000A
2/1/2024 12:07:55 PM	23.980V	0.0000A
2/1/2024 12:07:56 PM	24.792V	0.0000A
2/1/2024 12:07:56 PM	23.556V	0.0000A
2/1/2024 12:07:57 PM	23.924V	0.0000A
2/1/2024 12:07:57 PM	24.320V	0.0000A
2/1/2024 12:07:58 PM	23.314V	0.0000A
2/1/2024 12:07:59 PM	22.811V	0.0000A
2/1/2024 12:07:59 PM	14.001V	0.0000A
2/1/2024 12:08:00 PM	10.474V	0.0000A
2/1/2024 12:08:00 PM	8.2461V	0.0000A
2/1/2024 12:08:01 PM	5.6298V	0.0000A
2/1/2024 12:08:01 PM	4.7927V	0.0000A
2/1/2024 12:08:02 PM	4.1309V	0.0000A
2/1/2024 12:08:02 PM	3.5916V	0.0000A
2/1/2024 12:08:03 PM	2.7663V	0.0000A
2/1/2024 12:08:03 PM	2.4442V	0.0000A
2/1/2024 12:08:04 PM	2.1665V	0.0000A
2/1/2024 12:08:04 PM	1.7148V	0.0000A
2/1/2024 12:08:05 PM	1.5300V	0.0000A
2/1/2024 12:08:05 PM	1.3669V	0.0000A
2/1/2024 12:08:06 PM	23.638V	0.0000A
2/1/2024 12:08:06 PM	23.650V	0.0000A
2/1/2024 12:08:07 PM	23.659V	0.0000A
2/1/2024 12:08:07 PM	23.676V	0.0000A
2/1/2024 12:08:08 PM	24.746V	0.0000A
2/1/2024 12:08:09 PM	25.372V	0.0000A
2/1/2024 12:08:09 PM	24.940V	0.0000A
2/1/2024 12:08:10 PM	23.681V	0.0000A
2/1/2024 12:08:10 PM	23.676V	0.0000A
2/1/2024 12:08:11 PM	16.605V	0.0000A
2/1/2024 12:08:11 PM	25.136V	0.0000A
2/1/2024 12:08:12 PM	24.732V	0.0000A
2/1/2024 12:08:12 PM	23.701V	0.0000A
2/1/2024 12:08:13 PM	24.157V	0.0000A
2/1/2024 12:08:13 PM	25.063V	0.0000A
2/1/2024 12:08:14 PM	23.835V	0.0000A
2/1/2024 12:08:14 PM	25.521V	0.0000A
2/1/2024 12:08:15 PM	24.409V	0.0000A
2/1/2024 12:08:15 PM	23.697V	0.0000A
2/1/2024 12:08:16 PM	23.168V	0.0000A
2/1/2024 12:08:16 PM	25.195V	0.0000A
2/1/2024 12:08:17 PM	25.196V	0.0000A
2/1/2024 12:08:18 PM	24.887V	0.0000A
2/1/2024 12:08:18 PM	24.284V	0.0000A
2/1/2024 12:08:19 PM	24.060V	0.0000A
2/1/2024 12:08:19 PM	23.665V	0.0000A
2/1/2024 12:08:20 PM	25.170V	0.0000A
2/1/2024 12:08:20 PM	23.071V	0.0000A
2/1/2024 12:08:21 PM	23.885V	0.0000A
2/1/2024 12:08:21 PM	24.075V	0.0000A
2/1/2024 12:08:22 PM	23.778V	0.0000A
2/1/2024 12:08:22 PM	25.487V	0.0000A
2/1/2024 12:08:23 PM	25.693V	0.0000A
2/1/2024 12:08:23 PM	23.676V	0.0000A
2/1/2024 12:08:24 PM	25.215V	0.0000A
2/1/2024 12:08:24 PM	23.181V	0.0000A
2/1/2024 12:08:25 PM	21.997V	0.0000A
2/1/2024 12:08:25 PM	23.617V	0.0000A
2/1/2024 12:08:26 PM	25.577V	0.0000A
2/1/2024 12:08:26 PM	24.756V	0.0000A
2/1/2024 12:08:27 PM	25.181V	0.0000A
2/1/2024 12:08:28 PM	24.484V	0.0000A
2/1/2024 12:08:28 PM	24.195V	0.0000A
2/1/2024 12:08:29 PM	23.466V	0.0000A
2/1/2024 12:08:29 PM	23.682V	0.0000A
2/1/2024 12:08:30 PM	23.684V	0.0000A
2/1/2024 12:08:30 PM	22.741V	0.0000A
2/1/2024 12:08:31 PM	10.552V	0.0000A
2/1/2024 12:08:31 PM	8.3335V	0.0000A
2/1/2024 12:08:32 PM	6.8158V	0.0000A
2/1/2024 12:08:32 PM	4.8677V	0.0000A
2/1/2024 12:08:33 PM	4.2018V	0.0000A
2/1/2024 12:08:33 PM	3.6601V	0.0000A
2/1/2024 12:08:34 PM	3.2107V	0.0000A
2/1/2024 12:08:34 PM	2.5075V	0.0000A
2/1/2024 12:08:35 PM	2.2283V	0.0000A
2/1/2024 12:08:35 PM	1.9852V	0.0000A
2/1/2024 12:08:36 PM	1.5857V	0.0000A
2/1/2024 12:08:36 PM	1.4207V	0.0000A
2/1/2024 12:08:37 PM	1.2748V	0.0000A
2/1/2024 12:08:38 PM	1.0299V	0.0000A
2/1/2024 12:08:38 PM	0.9274V	0.0000A
2/1/2024 12:08:39 PM	0.8359V	0.0000A
2/1/2024 12:08:39 PM	0.6808V	0.0000A
2/1/2024 12:08:40 PM	0.6150V	0.0000A
2/1/2024 12:08:40 PM	0.5557V	0.0000A
2/1/2024 12:08:41 PM	0.5022V	0.0000A
2/1/2024 12:08:41 PM	0.4116V	0.0000A
2/1/2024 12:08:42 PM	0.3734V	0.0000A
2/1/2024 12:08:42 PM	0.3391V	0.0000A
2/1/2024 12:08:43 PM	0.2801V	0.0000A
2/1/2024 12:08:43 PM	0.2547V	0.0000A
2/1/2024 12:08:44 PM	0.2215V	0.0000A
2/1/2024 12:08:44 PM	23.760V	0.0000A
2/1/2024 12:08:45 PM	23.765V	0.0000A
2/1/2024 12:08:45 PM	23.760V	0.0000A
2/1/2024 12:08:46 PM	23.772V	0.0000A
2/1/2024 12:08:47 PM	23.775V	0.0000A
2/1/2024 12:08:47 PM	23.773V	0.0000A
2/1/2024 12:08:48 PM	23.772V	0.0000A
2/1/2024 12:08:48 PM	23.795V	0.0000A
2/1/2024 12:08:49 PM	23.808V	0.0000A
2/1/2024 12:08:49 PM	23.812V	0.0000A
2/1/2024 12:08:50 PM	23.824V	0.0000A
2/1/2024 12:08:50 PM	23.830V	0.0000A
2/1/2024 12:08:51 PM	23.827V	0.0000A
2/1/2024 12:08:51 PM	23.824V	0.0000A
2/1/2024 12:08:52 PM	23.824V	0.0000A
2/1/2024 12:08:52 PM	23.824V	0.0000A
2/1/2024 12:08:53 PM	23.822V	0.0000A
2/1/2024 12:08:53 PM	23.821V	0.0000A
2/1/2024 12:08:54 PM	23.820V	0.0000A
2/1/2024 12:08:54 PM	23.817V	0.0000A
2/1/2024 12:08:55 PM	23.810V	0.0000A
2/1/2024 12:08:56 PM	23.809V	0.0000A
2/1/2024 12:08:56 PM	24.621V	0.0000A
2/1/2024 12:08:57 PM	12.127V	0.0000A
2/1/2024 12:08:57 PM	9.3785V	0.0000A
2/1/2024 12:08:58 PM	7.5622V	0.0000A
2/1/2024 12:08:58 PM	6.2774V	0.0000A
2/1/2024 12:08:59 PM	4.5693V	0.0000A
2/1/2024 12:08:59 PM	3.9683V	0.0000A
2/1/2024 12:09:00 PM	3.4732V	0.0000A
2/1/2024 12:09:00 PM	2.7047V	0.0000A
2/1/2024 12:09:01 PM	2.4008V	0.0000A
2/1/2024 12:09:01 PM	2.1376V	0.0000A
2/1/2024 12:09:02 PM	1.7065V	0.0000A
2/1/2024 12:09:02 PM	1.5283V	0.0000A
2/1/2024 12:09:03 PM	1.3711V	0.0000A
2/1/2024 12:09:03 PM	1.2319V	0.0000A
2/1/2024 12:09:04 PM	0.9462V	0.0000A
2/1/2024 12:09:04 PM	0.8524V	0.0000A
2/1/2024 12:09:05 PM	0.7688V	0.0000A
2/1/2024 12:09:06 PM	0.6276V	0.0000A
2/1/2024 12:09:06 PM	0.5678V	0.0000A
2/1/2024 12:09:07 PM	0.5142V	0.0000A
2/1/2024 12:09:07 PM	0.4223V	0.0000A
2/1/2024 12:09:08 PM	23.837V	0.0000A
2/1/2024 12:09:08 PM	23.783V	0.0000A
2/1/2024 12:09:09 PM	23.791V	0.0000A
2/1/2024 12:09:09 PM	23.832V	0.0000A
2/1/2024 12:09:10 PM	23.836V	0.0000A
2/1/2024 12:09:10 PM	23.855V	0.0000A
2/1/2024 12:09:11 PM	23.841V	0.0000A
2/1/2024 12:09:11 PM	23.836V	0.0000A
2/1/2024 12:09:12 PM	23.833V	0.0000A
2/1/2024 12:09:12 PM	23.838V	0.0000A
2/1/2024 12:09:13 PM	23.846V	0.0000A
2/1/2024 12:09:13 PM	23.853V	0.3956A
2/1/2024 12:09:14 PM	0.2531V	0.0864A
2/1/2024 12:09:14 PM	0.1874V	0.0679A
2/1/2024 12:09:15 PM	23.750V	0.4988A
2/1/2024 12:09:16 PM	0.6099V	0.2775A
2/1/2024 12:09:16 PM	0.6099V	0.0000A
2/1/2024 12:09:17 PM	25.276V	0.0000A
2/1/2024 12:09:17 PM	22.050V	0.0000A
2/1/2024 12:09:18 PM	23.841V	0.0000A
2/1/2024 12:09:18 PM	23.848V	0.0000A
2/1/2024 12:09:19 PM	24.194V	0.0000A
2/1/2024 12:09:19 PM	21.808V	0.0000A
2/1/2024 12:09:20 PM	23.766V	0.0005A
2/1/2024 12:09:20 PM	23.780V	0.4988A
2/1/2024 12:09:21 PM	23.848V	0.0000A
2/1/2024 12:09:21 PM	23.843V	0.0000A
2/1/2024 12:09:22 PM	23.823V	0.0000A
2/1/2024 12:09:22 PM	23.757V	0.4991A
2/1/2024 12:09:23 PM	23.764V	0.4988A
2/1/2024 12:09:23 PM	0.0000V	0.0314A
2/1/2024 12:09:24 PM	0.0000V	0.0489A
2/1/2024 12:09:25 PM	0.0000V	0.0000A
2/1/2024 12:09:25 PM	0.0000V	0.0000A
2/1/2024 12:09:26 PM	23.631V	0.4988A
2/1/2024 12:09:26 PM	23.659V	0.0594A
2/1/2024 12:09:27 PM	0.2273V	0.0000A
2/1/2024 12:09:27 PM	23.571V	0.0000A
2/1/2024 12:09:28 PM	23.688V	0.4988A
2/1/2024 12:09:28 PM	0.6795V	0.0329A
2/1/2024 12:09:29 PM	23.698V	0.4991A
2/1/2024 12:09:29 PM	23.701V	0.0790A
2/1/2024 12:09:30 PM	0.5495V	0.0790A
2/1/2024 12:09:30 PM	0.5425V	0.1876A
2/1/2024 12:09:31 PM	0.5425V	0.4991A
2/1/2024 12:09:31 PM	23.713V	0.4991A
2/1/2024 12:09:32 PM	0.5202V	0.0167A
2/1/2024 12:09:32 PM	23.685V	0.0167A
2/1/2024 12:09:33 PM	23.726V	0.0687A
2/1/2024 12:09:34 PM	0.3504V	0.0777A
2/1/2024 12:09:34 PM	0.6468V	0.1235A
2/1/2024 12:09:35 PM	0.6468V	0.1235A
2/1/2024 12:09:35 PM	0.1309V	0.0000A
2/1/2024 12:09:36 PM	0.0000V	0.0000A
2/1/2024 12:09:36 PM	23.686V	0.4988A
2/1/2024 12:09:37 PM	23.742V	0.0576A
2/1/2024 12:09:37 PM	0.0932V	0.0576A
2/1/2024 12:09:38 PM	0.2423V	0.0761A
2/1/2024 12:09:38 PM	0.2423V	0.0761A
2/1/2024 12:09:39 PM	0.0849V	0.0429A
2/1/2024 12:09:39 PM	22.500V	0.0000A
2/1/2024 12:09:40 PM	24.570V	0.0000A
2/1/2024 12:09:40 PM	20.792V	0.0000A
2/1/2024 12:09:41 PM	23.808V	0.0000A
2/1/2024 12:09:41 PM	24.301V	0.0000A
2/1/2024 12:09:42 PM	23.412V	0.0000A
2/1/2024 12:09:42 PM	24.171V	0.0000A


  • +1
    TI__Guru 61175 points

    Hello Noel,

    Please check if the diode gets hot during these first 2 min (maybe you check only the first min to keep the board alive). If this is the case, it might be that the power dissipation in the diode is high enough to get in a thermal runaway.

    If a diode gets hot, the forward voltage increases which means it gets hotter and so on. So it might be necessary to change the diode to one that has either a better thermal connection to the board or a smaller forward voltage to not get into this runaway behavior. 

    This is an app note which helps to select an appropriate diode for a non-sync boost converter: Schottky Diode Selection in Asynchronous Boost Converters

    Best regards,
    Brigitte