Hello,
I am losing my time on a field, that I do not know – MOSFET. Namely, in a design, I have two possible sources of voltage – it can be active any of them or both with max 150mA. Till now I was on 5V and to have two diodes BAT754 it was not so big drop in percentage.
Now I switched to 3,3V and every mV counts. On net I saw design with MOSFET as a low drop diode. Since I need two, I tried with IRF7754 with around 34mOhm ON resistance. Result? If I apply voltage on any of inputs, there is a short.
Do any have any idea where I made mistake or how to solve this other way? Tnx.
Best regards,
Andrej
I am losing my time on a field, that I do not know – MOSFET. Namely, in a design, I have two possible sources of voltage – it can be active any of them or both with max 150mA. Till now I was on 5V and to have two diodes BAT754 it was not so big drop in percentage.
Now I switched to 3,3V and every mV counts. On net I saw design with MOSFET as a low drop diode. Since I need two, I tried with IRF7754 with around 34mOhm ON resistance. Result? If I apply voltage on any of inputs, there is a short.
Do any have any idea where I made mistake or how to solve this other way? Tnx.
Best regards,
Andrej
Attachments
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| Filename: | Version BAT754.bmp |
| Filesize: | 180.87 KB |
| Title: | First version |
| Information: | Version worked on 5V |
| Download counter: | 6 |
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| Filename: | Idea from net.gif |
| Filesize: | 5.53 KB |
| Title: | Idea from net |
| Information: | MOSFET as low drop diode |
| Download counter: | 41 |
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| Filename: | Version MOSFET.bmp |
| Filesize: | 246.07 KB |
| Title: | Version with MOSFET |
| Information: | Don't work - short on power |
| Download counter: | 10 |
