0.01 MA~ 3 Amp C.C LED Driver

As we all know that LED bulbs Are Sensitive to Voltage It need Either a good C.V / C.C , In this Post i am going to introduce a Precision C.C Led Driver Circuit That can Provide 0.01mA ~ 3 Amp.

In this Project SHUNT resistor are utilized to measure flow of current. Its Value Is from 1Ohm~2.2Ohm 1% for better accuracy.

OpAmp used in this project to compare 2 voltage level,( Set Voltage And Voltage produced from shunt when current is flowing). then it can switch mosfet. In this circuit i have used LM358 OpAmp you can use Low offset precision OpAmp.

TL431( Programmable Zener )used in this project to provide Precision Reference Voltage for OpAmp, This can be found in any faulty SMPS.

You can use 5% Tolerance resistors but 1% Will give you better results.

You are free to use any N-Channel Mosfet (IRFZ44N). We use Ohmic Region of mosfet Provide Variable Current.

Clips are used to easily connect various Loads.

Assemble all the components according to circuit diagram.

Working

Connect P1 And P2 to your power supply.

• C1 is used to filter supply voltage.
• R3 is used to limit current for TL431.
• R1 (POT) is used to set reference voltage for TL431.
• C2,C3 are used to filter any kind of noise.
• U2(OPAMP) are used as buffer (buffer is optional in this case) you can directly connect pin 3 of TL431 to 100K pot (R2). Buffer improves stability.
• R2(100K) are used as variable voltage divider,by the use of R2 we set a reference voltage at non inverting point of U1.
• U1 is used as comparator ,we set a reference a voltage at non-inverting point, when voltage at inverting point is less than non-inverting. than output is high. In this case mosfet start conducting than voltage drop occurs at R5.
• When voltage drop is more than reference voltage than output will pulled down, it cause mosfet in off state this cycle repeats again & again.
• So output current is equal to reference voltage.

Now Our project is ready to be checked and utilize for their work.

You can also check it on my youtube channel Channel

Make your own & let mw notify in comment section below,

THANK YOU