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3 votes

How to add 30 ms delay after 3.3 VDC rail is ON?

What you're looking for is called power rail sequencing. There are DC/DC converters that have this already built in. If you already have your PMIC you can use a voltage superviser which in turn can ...
kruemi's user avatar
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1 vote
Accepted

Finding out the correct Rds(on) value for design of the overcurrent circuit

Don't worry about Rds(on): To measure this precisely, and still operate within a cycle, the bandwidth has to be quite high, in particular the settling time. This is at odds with the large-value ...
Tim Williams's user avatar
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1 vote

Finding out the correct Rds(on) value for design of the overcurrent circuit

Power FET RDSON will always span a range. This comes from manufacturing variations, and temperature variations. As you show, the value at 25 C is typically 12.5 and could be 16 mΩ. Note the minimum ...
jp314's user avatar
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1 vote
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Voltage references to keep load cell readings stable

The HX711 has an internal regulator and the reading from a load cell (bridge) is ratiometric (typical +/-5ppm/°C gain drift) so it's very unlikely that tacking on some external reference will not make ...
Spehro Pefhany's user avatar
1 vote

How to add 30 ms delay after 3.3 VDC rail is ON?

You can try LM393 connected as schmitt trigger with small hysteresis to avoid glitches on its output if 3v3 rail raises noisy after power-on. Make R variable with trimmer to set precise 40ms. The most ...
Michal Podmanický's user avatar
1 vote

How to add 30 ms delay after 3.3 VDC rail is ON?

I am not sure where the 1% accuracy comes from, power rails do have some ramp time, especially if the load contains a lot of capacitance. So you need to pay attention to voltage levels at which you ...
Ale..chenski's user avatar
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1 vote

Is a shunt jumper for a power plane jumper a good idea?

You could even use several jumpers for different supply domains going to different parts of the circuit. That could help for problems that are not in the supply but in the circuit, to find out which ...
Jos Bergervoet's user avatar
1 vote

Is a shunt jumper for a power plane jumper a good idea?

Typically during first-round board design I include in schematic/PCB a discrete zero-ohm jumper between the power supply (just after the minimum required output filter caps) and the load net, and size ...
BK303's user avatar
  • 335

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