Checking Out GaN Half-Bridge Power Stage: Texas Instruments LMG5200 - Part 2: Dead Time Capture

RE: Checking Out GaN Half-Bridge Power Stage: Texas Instruments LMG5200 - Part 2: Dead Time Capture

Jan Cumps — Mon, 28 Sep 2015 19:24:13 GMT

I've tried a microcontroller generated deadband as alternative for the RC option above.

This can be used in those situations where you want to control the time by firmware.

[View:https://www.youtube.com/watch?v=4CJ8gA5ZzIo:740:466]

I'm using the etPWM module of a Hercules microcontroller.

RE: Checking Out GaN Half-Bridge Power Stage: Texas Instruments LMG5200 - Part 2: Dead Time Capture

Jan Cumps — Sat, 12 Sep 2015 12:44:59 GMT

I've uploaded a related video:

Gallium Nitride Half-Bridge (GaN FETs) and The Art of Electronics Third Edition - Déjà Vu

[View:https://www.youtube.com/watch?v=LW5N15BiSSw:1110:699]

The reference design for LMG5200 vs Page 23 of Art of Electronics, Third Edition: Figure 1.37.

[View:/resized-image/__size/569x384/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-eaa276e2-c49c-44e0-9ce0-3ebf00e755a1/contentimage_5F00_190613.png:569:384]

RE: Checking Out GaN Half-Bridge Power Stage: Texas Instruments LMG5200 - Part 2: Dead Time Capture

Jan Cumps — Fri, 11 Sep 2015 07:47:05 GMT

TI published an article I wrote about driving GaN on their E2E community blog:

https://e2e.ti.com/blogs_/b/powerhouse/archive/2015/09/10/control-a-gan-half-bridge-driver-with-a-single-pwm-signal

https://e2e.ti.com/blogs_/b/powerhouse/archive/2015/09/10/control-a-gan-half-bridge-power-stage-with-a-single-pwm-signal

RE: Checking Out GaN Half-Bridge Power Stage: Texas Instruments LMG5200 - Part 2: Dead Time Capture

Jan Cumps — Fri, 04 Sep 2015 18:46:31 GMT

Excuses for the blurry scope captures. I forgot to save the images, so I had to cut them out of the video material, and that's not as sharp as I would like.

RE: Checking Out GaN Half-Bridge Power Stage: Texas Instruments LMG5200 - Part 2: Dead Time Capture

jw0752 — Fri, 04 Sep 2015 04:26:33 GMT

Thank you Jan,

I learned several new things by reading and watching your video. This type of experiment is really great.

John

RE: Checking Out GaN Half-Bridge Power Stage: Texas Instruments LMG5200 - Part 2: Dead Time Capture

DAB — Thu, 03 Sep 2015 19:48:11 GMT

I am curious, did you have a fast enough scope to see any high frequency ringing for that fast of a current rise?

I am not sure if the real waveform would be that smooth or if there is some filtering going on.

DAB