# ADM1270 - High voltage input protection device as current limiter

Discussion in 'General Electronics Chat' started by Skubby SkinnyChubby, Jul 13, 2015.

1. ### Skubby SkinnyChubby Thread Starter New Member

Jun 19, 2015
25
1
Hi,

do you guys know how to use this IC ADM1270 as current limiter?
i need this IC to limit current to 9A

thanks guy

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Last edited: Jul 14, 2015
2. ### crutschow Expert

Mar 14, 2008
13,498
3,374
Suggest you read pages 15, 16, and 17 of the data sheet to learn how to connect it as a current limiter.
If you have any questions after that, get back with us and we'll try to answer them.

3. ### Skubby SkinnyChubby Thread Starter New Member

Jun 19, 2015
25
1
from what i understand Rsense (connected to Vcc/sense+ and sense - ) is used to limit the current....

4. ### Skubby SkinnyChubby Thread Starter New Member

Jun 19, 2015
25
1
i roughly know how to connect as a current limiter but how to compute the value for Rsense?

5. ### crutschow Expert

Mar 14, 2008
13,498
3,374
Did you read the section titled "SETTING THE CURRENT LIMIT (ISET)" on page 16?
For example, if you use the default current sense voltage limit (Vlim) of 50mV, then you would need a Rsense of 50mV / 9A = 5.55mΩ.
You can vary Vlim from 12.5 mV to 62.5 mV to adjust the limit current and compensate for the particular Rsense resistor value you may have.

Skubby SkinnyChubby likes this.
6. ### Skubby SkinnyChubby Thread Starter New Member

Jun 19, 2015
25
1
yeah i did, but still kinda confuse. Thanks alot, I will read the user guide again

7. ### crutschow Expert

Mar 14, 2008
13,498
3,374
What is this 9A powering?
What is the normal current?

8. ### Skubby SkinnyChubby Thread Starter New Member

Jun 19, 2015
25
1
What is this 9A powering?
is used to powering a DC motor

What is the normal current?
as in...??

9. ### #12 Expert

Nov 30, 2010
16,693
7,334
What is the normal current the motor uses? Why is this particular motor unable to limit its own current? Billions of motors run properly if only given the right amount of voltage. What makes this one different?