All Questions
Tagged with current-limiting power-supply
10
questions
8
votes
3
answers
13k
views
Help needed optimising simple current limiting circuit
I have been experimenting with simulating current limiting circuits. I am trying to limit current to ~500mA given a fixed 4.8V source. I have started using a circuit like the one found on this ...
- 1,341
5
votes
1
answer
14k
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Current limiters using transistors and diodes
I have been experimenting with simulating current limiting circuits. I am trying to limit current to ~500mA given a fixed 4.8V source. I started a question based on a conventional 2-transistor current ...
- 1,341
10
votes
4
answers
11k
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Why is LED lighting up despite Supply voltage < Forward voltage
I have an LED which has specified Typical forward voltage of 3.5V and Maximum forward voltage 3.9V.
I applied 3.3V across it with a 300 Ohm resistor in series. Why did it light up?
I am wondering if ...
- 4,942
10
votes
6
answers
7k
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Prevent overcurrent while filter capacitor is charged
I have this circuit:
On start-up, the power supply experiences an overcurrent condition, because when the capacitor is charged, it looks like a short circuit as seen from the power supply. How can I ...
user54579
1
vote
4
answers
4k
views
Understanding DALI power supply
I am working on a DALI system and I came across this schematic for the DALI power supply in a Microchip app note AN1465:
It says the power line can be 12-20 Volts but the current has to be limited to ...
- 8,361
1
vote
1
answer
161
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Why is the MOSFET current taking time to rise in linear mode of operation?
In the below current limiter circuit, why is the MOSFET current rising slowly?
Shouldn't the MOSFET current follow the equation \$i_D=\kappa(V_{GS}-V_{th})^2\$?
Ref: How to Make Linear Mode Work
- 3,032
1
vote
3
answers
2k
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Switching circuit for driving LED at different current values
simulate this circuit – Schematic created using CircuitLab
Above schematic is for limiting current to 4A when battery is connected to LEDs.
Datasheet of LED(BXRA-56C5300H 50W) are 23.5 Vf and 2....
- 9
1
vote
1
answer
4k
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What to consider when powering multiple devices in parallel?
Briefly about my background, which might inform the question. I'm currently self-educating myself on some electrical engineering on-the-job. I'm learning from Art of Electronics and some other ...
- 23
0
votes
1
answer
3k
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MOSFET Based Current Limiter
I know this question is not new, in fact I learned the basics of this circuit from sites including this one. However I am planning on making a PCB with it and do not have the luxury of multiple ...
user56054
-5
votes
2
answers
191
views
power limiting peltiers [closed]
I am trying to power a set of peltiers and am having some concerns, while I have a computer power supply I can dedicate to the product these are often high in the amps they can deliver, and the ...
