Timeline for What is the mode of MOSFET or BJT in buck converter?
Current License: CC BY-SA 4.0
10 events
| when toggle format | what | by | license | comment | |
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| Aug 20, 2023 at 18:01 | history | bumped | CommunityBot | This question has answers that may be good or bad; the system has marked it active so that they can be reviewed. | |
| Apr 20, 2023 at 8:03 | history | bumped | CommunityBot | This question has answers that may be good or bad; the system has marked it active so that they can be reviewed. | |
| Aug 23, 2022 at 13:25 | comment | added | Unimportant | It's a high side switch since it's switching the positive side of the supply. When the FET is turned on it's source will rise toward the positive supply voltage as it starts conducting. So the gate must rise along, otherwise Vgs gets smaller. Vgs is what keeps the FET turned on. Without some mechanism such as a bootstrap capacitor all you get is a source follower. | |
| Aug 23, 2022 at 11:28 | comment | added | lsi | What is 'high side switch' for N-FET? Why I need to keep Vgs up? Is that because of the source voltage being positive value when FET is conducting? @Unimportant | |
| Aug 23, 2022 at 8:56 | answer | added | winny | timeline score: 1 | |
| Aug 23, 2022 at 8:54 | comment | added | Unimportant | Note that using a N-FET as a high side switch requires some mechanism to keep Vgs up as the source rises when the FET is conducting. | |
| Aug 23, 2022 at 8:49 | answer | added | Frog | timeline score: 0 | |
| Aug 23, 2022 at 8:48 | history | edited | winny | CC BY-SA 4.0 |
edited body; edited title
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| S Aug 23, 2022 at 8:41 | review | First questions | |||
| Aug 23, 2022 at 9:08 | |||||
| S Aug 23, 2022 at 8:41 | history | asked | lsi | CC BY-SA 4.0 |