Interesting ChatGPT claim - Page 1
Forum section: electronics / general

author: BadeBhaiya
author_rank: Regular Contributor
timestamp: April 26, 2025, 08:49:22 am
content: Am i right to consider this insane or is ChatGPT smoking something strong? Or am i just out of touch?50ns rise/fall time is insane right? Really fast.

author: Fflint
author_rank: Frequent Contributor
timestamp: April 26, 2025, 09:25:40 am
content: Why don't you ask chatgpt? I'd say something like: "how about you stop inventing stuff and tell me the truth instead" followed by, "are you absolutely sure of this" and so on.Ask it to give you application examples of devices in each category and be sure to verify the answers (first by being very inquisitive and second outside chatgpt)Edit: also when it gives you any reference "how about you give me actual real references or admit you don't know any"

author: BadeBhaiya
author_rank: Regular Contributor
timestamp: April 26, 2025, 09:42:22 am
content: Its like talking to a child. You have to dig for several minutes to get them to reveal what happened at school.This still seems incorrect to me (as a power electronics beginner). Sillicon FETs are definitely able to switch at 1MHz and above

author: RoGeorge
author_rank: Super Contributor
timestamp: April 26, 2025, 09:53:40 am
content: This forum has a dedicated place for topics like this, please use it:https://www.eevblog.com/forum/chatgptai/

author: BadeBhaiya
author_rank: Regular Contributor
timestamp: April 26, 2025, 09:57:06 am
content: Quote from: RoGeorge on April 26, 2025, 09:53:40 amMy apologies, didn't see that

author: RoGeorge
author_rank: Super Contributor
timestamp: April 26, 2025, 10:03:32 am
content: No need to apologize, only letting you know.In case you want to move this topic there, there is also a button at the bottom of the page to move a topic one opened in another section of the forum.

author: SiliconWizard
author_rank: Super Contributor
timestamp: April 26, 2025, 01:54:32 pm
content: Taking at face value anything coming out of LLMs is the "insane" part.Now with the technical question:Without full context, how can we say anything really relevant? Now if you're wondering whether 50 ns rise/fall time is "insane" for power MOSFET switching, maybe you can have a look at "modern" gate drivers. Such as this:https://www.ti.com/product/LMG1020Welcome to the 21st century.

author: David Hess
author_rank: Super Contributor
timestamp: April 26, 2025, 04:40:41 pm
content: Power MOSFETs can definitely switch at 50 nanoseconds and faster with proper circuit design and layout, and that is with leaded parts. Surface mount parts allow for even faster operation because of lower lead inductance. Nothing exotic is required.

author: BadeBhaiya
author_rank: Regular Contributor
timestamp: April 26, 2025, 04:59:23 pm
content: Well this is embarrassing. I legit did not know such fast gate drivers existed.

author: David Hess
author_rank: Super Contributor
timestamp: April 26, 2025, 08:01:29 pm
content: Quote from: BadeBhaiya on April 26, 2025, 04:59:23 pm2 amp and higher current integrated gate drivers with 20 nanosecond switching speeds have been commodity parts for a long time from companies like International Rectifier. Before they become available, perforated emitter bipolar transistors from companies like Zetex were used to make discrete drivers with similar performance. It cannot quite be done with single 2N4401/2N4403 or 2N2222/2N2907 bipolar pairs, but a bunch in parallel could do it. There are some other fast power transistors which could have been used to do it in the past, but they are no longer produced. I think there is an old Siliconix or International Rectifier application note which discusses doing it with small discrete power MOSFETs.In the past designs did not bother with such fast switching because it just was not needed when operating at typical switching frequencies. A bunch of logic gates in parallel driving the MOSFET gate, or a 2N4401/2N4403 or 2N2222/2N2907 pair was good enough.

author: bitwelder
author_rank: Super Contributor
timestamp: April 30, 2025, 09:34:45 am
content: When asking for "data" from ChatGPT or other LLM, it's generally useful to ask for references for its answers, so it can provide e.g. links to datasheets to back-up its statements.