Im needing a schematic where the given power supply can set the constant current before plugging in the load.
Im needing a schematic where the given power supply can set the constant current before plugging in the load.Do you need a power supply that will display the current limit before you plug in the load ? If yes, maybe your ltc3780 supply can be modified, post the schematic.
Or do you need a power supply that when hooking up the load, it will regulate the current to the set limit very fast ?
the ltc3780 can limit the current to max 200mA which is way to much for precision work.
the ltc3780 can limit the current to max 200mA which is way to much for precision work.By default you may be right, but there is no reason you can't modify it to impose better current limiting, if you're happy with the design you have.
You would do this by sensing the current yourself and controlling the voltage on the feedback pin.
If you want a new design, I think you need to give more details what you're looking for for people to be able to come up with ussefful suggestions : Ex: linear, buck, boost, switching, lcd display, bluetooth, etc
Please define "precision power supply" - are you after absolute voltage or precise current?
What makes it precision? - are you after thermal stability or very fine (microVolt/amp) control
You have not specified whether you want
a) Constant Voltage (you set the voltage and let the current vary)
OR
b) Constant Current ( you set the current and let the voltage vary)
It is impossible to do both, see Ohms law.
It is impossible to do both, see Ohms law.
Then how do some powersupplies come with a function of switching the modes between constant current and constant current such as a cheap power supply from china called "YIHUA PS-3010D"
"The 1mV/mA goal is very ambitious and you're unlikely to achieve it cheaper in a one-off design"
I do not agree with that. As I said, go for an Op-Amp driven circuit, they have the closed loop bandwith to achieve the control you are after.
is it normal for a bench PSU of constant voltage to drop by .5V under load? such as with 2A load?
Im measuring from my router, its one of those meant to use in a datacenter.
The output voltage on the bench PSU says 24.5V. The router reads 24.0V and is trying around 2A. Both the router's and PSU's amp display are the same.
During lower loads around 1.3A the voltage drop is only about .2 or .3V. When i measure with a multimeter with no load the voltage is accurate to about .1V variance.
edit: I just measured the output with wattmeter with my router running. Output reports 24.5V, multimeter says 24.3V at output and router says 24V. The voltage isnt a big issue since the router is designed to operate from 13V to 36V but i thought i would test the supply under load.