Is it possible to create a device that forces current in a practical design?

[mssong]

I am designing an LDO.
In simulation, I'm using an idc source instead of a resistor to see if I can supply the desired current value,
but does a device exist that can force current like an idc source in the real world?

Thank you.

 

[crutschow]

There are circuit configurations and IC's that can generate a constant current from a voltage source (current-mirrors are often used in analog ICs for that purpose) but none that can generate constant-current by themselves the way a battery generates a (mostly) constant-voltage.

Look up constant-current circuits, if interested.

 

[KlausST]

What about doing an internet search for "constant current circuit"

Klaus

 

[mssong]

What about doing an internet search for "constant current circuit"

Klaus

There are circuit configurations and IC's that can generate a constant current from a voltage source (current-mirrors are often used in analog ICs for that purpose) but none that can generate constant-current by themselves the way a battery generates a (mostly) constant-voltage.

Look up constant-current circuits, if interested.

I know there are sources that can supply constant current.

But what I want is an answer to the question of which devices can force a current to be drawn regardless of other loads.

 

[KlausST]

Hi,

a constant current source is .. what it´s name says. The current is constant .. independent of load impedance (for a limited range)

It´s very unclear what

to be drawn regardless of other loads

means.

Textual description is not very useful to describe circuits
Thus some smart people invented schematics. So let´s use it!


Klaus

 

[BradtheRad]

An inductor at the moment of shut-off attempts to continue carrying the same amount of Amperes as it did just beforehand. For a brief time it generates sufficient voltage to do this. The voltage can soar up to thousands, even to the point where sparks jump across conductors (arcing). To create a longer time (inductive time constant) while current fades, use a large Henry value and low ohms.