I am making an led driver circuit. My led specification is 3.6V(typical), 140mA. My supply is from the car battery, say Vin is from 9V to 16V.
So basically i want to use a regulator for the battery so that i can get 12V constant and then using LM317L i can get the led specification.
I want to know how to regulate the car battery voltage or 9V-!6V to 12V.
Initially i made a circuit using LM317Ls basic adjustable regulator circuit for Vin 12V (R1=200Ω, R2=500k potentiometer) but the problem was when i was increasing or decreasing the voltage the output voltage and current was differing which i do not want. I am looking for constant voltage and current circuit.
So basically i want to use a regulator for the battery so that i can get 12V constant and then using LM317L i can get the led specification.
I want to know how to regulate the car battery voltage or 9V-!6V to 12V.
Initially i made a circuit using LM317Ls basic adjustable regulator circuit for Vin 12V (R1=200Ω, R2=500k potentiometer) but the problem was when i was increasing or decreasing the voltage the output voltage and current was differing which i do not want. I am looking for constant voltage and current circuit.