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[SOLVED] 4 channel current limiter device 350 mA or more?

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mosfet123

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Hi;

İs there a current limiter component that 4 or more channel output and each channel be able to 350mA or over?
 

What does the load look like, its current and V requirements, and what does the power
source look like.


Regards, Dana.
 

It can get 350mA in the range of 3-12V DC.
 

Not clear, you have a power supply, its V range is what ? 3 - 12 Vdc ?

You have a load, you want constant current thru it, so what is its
min/max voltage or better yet what is the load ?

Regards, Dana.
 

I have 12V CV driver. I need current regulator. But ı dont have much space on board run 2 -3 pieces rgbw led. as you know red light about 5V and blue 7V so if is there small package component? i can use it . Normally i can transistor but they cover much more area on board
 

You are corerct to drive with constant current, then brightness is
fairly well regulated. But that takes an active circuit. One of the
simplest is use a 3 terminal reg and a R to operate it in constant
current. But if you are delivering 350 mA into a load, say RED LED,
then LDO has to dissipate ( 12V - 5V) * .35 = ~ 2.5W, thats a lot of
power to dissipate, heat sink required.

1604162682610.png


If you dont want "active" regulation a resistor will do, except the current
will not be regulated.


Regards, Dana.
 

    mosfet123

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Hi,

Small board space .. and linear regulating constant current.
Are you aware that (input_voltage - LED_voltage) × LED_current is dissipated as heat?
No matter what circuit you use. Resistor, BJT, MOSFET...all the same power dissipation.

Then: the smaller the board space, the lees you can spread the heat ... resulting in high temperature.
Maybe too high.

Klaus
 

    mosfet123

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