The Best Protection for your Circuits? eFuse! Here is why they are awesome! EB#48
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Date: 2021-04-18
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Comments and reviews: 9
Jens
The other day I connected a 3. 3 volt voltage regulator to 12 volts. Switching the switching power supply on and off went well several times. But when switching, the power supply unit must have charged itself to over 14 volts, limit of the V regulator. The voltage regulator short-circuited and the circuit behind it suddenly had 7 volts.
I heard the 4 volt tantalum capacitor explode.
The IC behind it was specified up to 5. 5 volts, but survived.
From my box I then put a diode and a 78L12 in front of the new 3. 3 volt voltage regulator.
So the 3. 3 V regulator doesn't see more than 10 to 12 volts, that's in the rules.
The 78L12 will not be able to regulate well with a 12 volt input, but it will certainly withstand voltage peaks.
I didn't have a 78L09 that would be the better choice.
Another possibility would be to build a 3. 3 volt regulator with an LM317. But I didn't have any space left.
reply
The other day I connected a 3. 3 volt voltage regulator to 12 volts. Switching the switching power supply on and off went well several times. But when switching, the power supply unit must have charged itself to over 14 volts, limit of the V regulator. The voltage regulator short-circuited and the circuit behind it suddenly had 7 volts.
I heard the 4 volt tantalum capacitor explode.
The IC behind it was specified up to 5. 5 volts, but survived.
From my box I then put a diode and a 78L12 in front of the new 3. 3 volt voltage regulator.
So the 3. 3 V regulator doesn't see more than 10 to 12 volts, that's in the rules.
The 78L12 will not be able to regulate well with a 12 volt input, but it will certainly withstand voltage peaks.
I didn't have a 78L09 that would be the better choice.
Another possibility would be to build a 3. 3 volt regulator with an LM317. But I didn't have any space left.
reply
Jess
Very cool. There might be a big market for eFuse demo boards with trim-pots for adjusting voltage and current control, and Pheonix connectors so people could wire these into their projects. Post-assembly powered functional testing would be a great application. I can't tell you the number of times I've seen small circuits boards scrapped during manufacturing because there was a short somewhere that damaged something on first power up (during functional testing. By controlling the power to the UUT, these could even protect against damage to other components in a system or the test equipment, to some extent.
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Very cool. There might be a big market for eFuse demo boards with trim-pots for adjusting voltage and current control, and Pheonix connectors so people could wire these into their projects. Post-assembly powered functional testing would be a great application. I can't tell you the number of times I've seen small circuits boards scrapped during manufacturing because there was a short somewhere that damaged something on first power up (during functional testing. By controlling the power to the UUT, these could even protect against damage to other components in a system or the test equipment, to some extent.
reply
Bigdaddy
You have just solved a design problem I ve been dealing with for almost a year! Thanks you so much. I had no idea that these chips existed. Dang. I m too old. Got my Electrical Engineering degree 46 years ago. Used a slide rule. No cell phones and no HP calculators. Oh, well. I will be using JLCPCB and building a new revision of my board with these efuses on them. Now to study the data sheet.
GREAT SCOTT is really great! Thanks for a really great video!
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You have just solved a design problem I ve been dealing with for almost a year! Thanks you so much. I had no idea that these chips existed. Dang. I m too old. Got my Electrical Engineering degree 46 years ago. Used a slide rule. No cell phones and no HP calculators. Oh, well. I will be using JLCPCB and building a new revision of my board with these efuses on them. Now to study the data sheet.
GREAT SCOTT is really great! Thanks for a really great video!
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Gianluca458
WAIT. It limits the current on the output. But. The voltage still doesn't drop? What? Did i get it wrong or it is actually like this? Please i want to know this! If a chip like this actually exists i will order the entire stock avaiable! And if i get this wrong i will still buy the entire stock avaiable because this chip is still awesome! But. It seems weird that you can limit the current without dropping the voltage. HELP ME!
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WAIT. It limits the current on the output. But. The voltage still doesn't drop? What? Did i get it wrong or it is actually like this? Please i want to know this! If a chip like this actually exists i will order the entire stock avaiable! And if i get this wrong i will still buy the entire stock avaiable because this chip is still awesome! But. It seems weird that you can limit the current without dropping the voltage. HELP ME!
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Warhawk76
I have always meant to ask you what you do with all the drawings you make in these videos. Do you keep them all or toss them or what? I really want to know so please tell me.
Love your video BTW. I don't really do much electronics work, but I still love your videos!
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I have always meant to ask you what you do with all the drawings you make in these videos. Do you keep them all or toss them or what? I really want to know so please tell me.
Love your video BTW. I don't really do much electronics work, but I still love your videos!
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Dinshith
Yesterday I made audio amplifier from the circuit you had already made in another video but the transistor bc637 was exploded due to short circuit. I didn't notice that I placed the circuit on soldering lead. So I cannot see the results.
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Yesterday I made audio amplifier from the circuit you had already made in another video but the transistor bc637 was exploded due to short circuit. I didn't notice that I placed the circuit on soldering lead. So I cannot see the results.
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Asu
The best protection for your circuit is when you accidentally soldered same-gendered connectors on both device and supply side. Can't smoke any electronic if you can't power it in the first place.
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The best protection for your circuit is when you accidentally soldered same-gendered connectors on both device and supply side. Can't smoke any electronic if you can't power it in the first place.
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Ed19601
Not sure about mouser in germany but for netherlands mouser's postage makes every chip expensive.
But i presume you ended up getting it at aliexpress as well
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Not sure about mouser in germany but for netherlands mouser's postage makes every chip expensive.
But i presume you ended up getting it at aliexpress as well
reply
Low
Can this efuse be used to modify existing products. I can think of a few that do not have these protections. Cheep Chinese component testers for example.
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Can this efuse be used to modify existing products. I can think of a few that do not have these protections. Cheep Chinese component testers for example.
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