Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronic Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

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

Status
Not open for further replies.

mosfet123

Junior Member level 1
Joined
Oct 13, 2020
Messages
17
Helped
0
Reputation
0
Reaction score
1
Trophy points
3
Activity points
104
Hi;

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

danadakk

Advanced Member level 1
Joined
Mar 26, 2018
Messages
493
Helped
100
Reputation
199
Reaction score
115
Trophy points
43
Activity points
2,456
What does the load look like, its current and V requirements, and what does the power
source look like.


Regards, Dana.
 

mosfet123

Junior Member level 1
Joined
Oct 13, 2020
Messages
17
Helped
0
Reputation
0
Reaction score
1
Trophy points
3
Activity points
104
It can get 350mA in the range of 3-12V DC.
 

danadakk

Advanced Member level 1
Joined
Mar 26, 2018
Messages
493
Helped
100
Reputation
199
Reaction score
115
Trophy points
43
Activity points
2,456
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.
 

mosfet123

Junior Member level 1
Joined
Oct 13, 2020
Messages
17
Helped
0
Reputation
0
Reaction score
1
Trophy points
3
Activity points
104
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
 

danadakk

Advanced Member level 1
Joined
Mar 26, 2018
Messages
493
Helped
100
Reputation
199
Reaction score
115
Trophy points
43
Activity points
2,456
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

    points: 2
    Helpful Answer Positive Rating

KlausST

Super Moderator
Staff member
Joined
Apr 17, 2014
Messages
18,415
Helped
4,112
Reputation
8,224
Reaction score
4,046
Trophy points
113
Activity points
121,223
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

    points: 2
    Helpful Answer Positive Rating
Status
Not open for further replies.
Toggle Sidebar

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top