Subject: To regulate down voltage by the current over a small resister the voltage out from an Singel chanel LDO par example LP 2985-N , 5V,SOT 23-5
Hallo..I am stucked in my thoughts. I thought I could decrease the voltage out of the measured current by putting a current resistor to the ground, but it works in the opposite way. How do I decrease the voltage by increased current?
My case is:
I want to regulate by a change in current of 2A a decrease in Vout from 1.16 V to 1.10 V , par example Vout from a voltage divider of 1.3 ΩkΩ/4.3 kΩ when you vary the voltage over the voltage divider from a LDO which gives a fix 5.0V down to 4.75V over the voltage divider created by an extra resistor 0.125 Ω in the voltage divider where the current up to 2 A pass through.. The 5.0V is chosen from the LM29858-5 because I need it in more places and I have the PCB made for it, it’s small, endure high temperature…perhaps I need an op instead but how and what? .