How can i limit the current to get 1.5A to power the ic with out frying it.If i have a battery of 3.7v 20000mah and i want to power a circuit with an ic with max current o 2.5A.
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How can i limit the current to get 1.5A to power the ic with out frying it.If i have a battery of 3.7v 20000mah and i want to power a circuit with an ic with max current o 2.5A.
U mean, no matter the current supplied the circuit will draw the current it needs to power up only.As long as the voltage is correct you don't need to worry that the power supply is capable of supplying more than 1.5 amps. The load will only take the current it requires providing that the power supply is capable of supplying 1.5 amps or more.
Les.
Too much voltage which will cause more current. If the voltage is correct then the device will take the current it needs. Like Dick said, a 10A socket (or whatever it is in your country) will power an LED lamp that needs just 0.03A to power it.So what makes circuit or an ic burn out?
Yes; with the appropriate supply voltage, the device will be fine as long as it's not overloaded.U mean, no matter the current supplied the circuit will draw the current it needs to power up only.
So what makes circuit or an ic burn out?
Thanks manToo much voltage which will cause more current. If the voltage is correct then the device will take the current it needs. Like Dick said, a 10A socket (or whatever it is in your country) will power an LED lamp that needs just 0.03A to power it.
Mike.
Edit, check what voltage your circuit/IC needs.
Ok u mean if i drive 10A 10v through a circuit with a max of 2.5A 5v it will burn out.Yes; with the appropriate supply voltage, the device will be fine as long as it's not overloaded.
It's current available, rather than it being forced in to whatever is connected.
Voltage is like "pressure" that can force too high power, it's that which is critical.
Failures are typically from too high a voltage so it breaks down internally, or drawing too much current from (through) the device; either a large overload that blows the internals directly, or with less extreme overloads, heat building up until the device fails from excess temperature.
Pretty much right.Am i right or am still missing something?
As long as the voltage is correct you don't need to worry that the power supply is capable of supplying more than 1.5 amps. The load will only take the current it requires providing that the power supply is capable of supplying 1.5 amps or more.
Les.
Clearly understood it now.Pretty much right.
The current rating of the supply does not matter, as long as it is high enough to run whatever is connected.
On the other side of things, if you eg. used an IC or transistor with a maximum rating of 2.5A and tried to use that to control a load (such as a motor or lamp) that takes 5A at the working voltage, then the IC or transistor is probably going to start leaking it's magic smoke!
Yea man just a beginnerTo use the water analogy, voltage is pressure, current is how much can be supplied or is supplied. Turn a tap on enough and all the pressure will be gone (at the tap inlet) and lots of water will flow. As you turn it off, the pressure increases as the flow decreases. The tap is the same as a variable resistor or, in your case, your circuit (which is partially open). Not a very good analogy but hopefully you get the idea.
Mike.
Thanks manIf you think about it another way then if there was nothing connected to the output of the power supply and it was still outputting 10 amps it would have to supply tens of thousands of volts so it could arc across it's output terminals as the only way to provide a path for the current.
Les.
Thanks dana✌Current limits can protect both upstream circuits and downstream. A circuit can fail drawing
excess current or a short or an open or anything in between. A current limit can leave a
load still active while limiting its max allowed current, or it can make the downstream
load fail to operate due to voltage collapse. You can have fixed current limits like being
discussed (graph on left) in this thread, or even foldback current (graph on right) limits :
View attachment 139475
Graph on left notice when in current limit the load voltage can range from
Vconst to 0, depends on what current limit circuit and load are doing. The
current limit V vertical portion of graph can also have more of a slope to
it, depends on how its implemented.
Regards, Dana.