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[SOLVED] led driver

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mosfet123

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Hi;

I want to run 6pieces serial power led with 24 V DC 700mA. So ı need current limitter circuit. İs anyone advice to me? Which parts i have to use .
 

If you have 6 led strips, with a total power of 24*0.7 = 16.8W. You can put 6 current limiting resistors in every strip, every resistor has to be 5W.
--- Updated ---

If you have 6 led strips, with a total power of 24*0.7 = 16.8W. You can put 6 current limiting resistors in every strip, every resistor has to be 5W.
 

Actually ı want to use smps circuit
 

LM 2596 is what I have been using, but you will still need a resistor. You can raise the voltage or use a 1R resistor with a small voltage drop. It depends how much will be the drop over your LEDs.
 


Do you have schematic with LM2596. I use 6 pieces high power led at 700mA each one about 3V. They will connect series
 

Hi,

the schematic for LM2596 is given in it´s datasheet. What else do you need?

Klaus
 

I want to to fixed 700mA. It generate fixed voltage. How can i do fix700mA. 6 Series led about 18V DC
 


Thanks. I have one more question. My leds totaly voltage are variable according to led brands it gets 16,8V to up to 18. Should i choose maksimum value ?
 

Hi,

internet search: "700mA LED driver"
internet search: "700mA LED driver schematic"
internet search: "lm2596 constant current"
internet search: "lm2596 constant current LED schematic"

Many thousands of hits, even videos. As far as I see exacly what you want.

Didn´t you try an internet search before posting? What´s wrong with the results?

Klaus
 

mosfet123 said:
Thanks. I have one more question. My leds totaly voltage are variable according to led brands it gets 16,8V to up to 18. Should i choose maksimum value ?
Click to expand...

Yes, in the design tool max Vled, min Vsupply what you should use. But then
check power and thermals with max Vsupply.


Regards, Dana.
 
KlausST said:
Hi,

internet search: "700mA LED driver"
internet search: "700mA LED driver schematic"
internet search: "lm2596 constant current"
internet search: "lm2596 constant current LED schematic"

Many thousands of hits, even videos. As far as I see exacly what you want.

Didn´t you try an internet search before posting? What´s wrong with the results?

Klaus
Click to expand...
Already i have searched. İf you dont know ı explain to you. Constant current different than constant voltage. Lm2596 usually use constant voltage. Do you understand.
 

Hi,

I´m an electronics designer for decades now. Thus - Yes, I understand.

And I understand that LM2596 usually is used for voltage control. Usually.
And I understand that an LM2596 may as well be used for current control. (Maybe you don´t understand. )

And there are many solutions/schematics/documents/even videos in the internet doing exactly this - current control.
Doing 700mA constant current LED control. This is what you need. (as far as I understand)
They easily can be found with the above internet searches.

* they fulfill your requirement of post#1: 24V input 700mA LED current limiter
* they fulfill your requirement of post#3: SMPS
* they fulfill your requirement of post#6: they show the according LM2596 schematic
* they fulfill your requirement of post#8: constant current of 700mA into an (about) 18V load.

Klaus
 
Last edited:

Dear Klaus

you may a designer . But It is the best way to talk and discuss a topic. even better to talk face to face. You should learn these before becoming designer. Topic is closed. good deeds

Thanks to everyone who wrotes
 

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