Looking for a voltage regulator that allows input of -40~+40V and outputs around 5V

ycwangxiang

Looking for a voltage regulator that allows input of -40~+40V and outputs around 5V [Copy link]

I am looking for a voltage regulator that allows input of -40~+40V and outputs about 5V, preferably 6.5V. The back-end circuit works normally with a 6.5V power supply. I am now looking for a voltage regulator that can withstand 40 forward and 40 reverse voltages to protect the back-end circuit.

maychang

Looking for a voltage regulator that allows input of -40~+40V and outputs about 5V -40~+40V, this range includes zero. How can the output be 5V if the input is zero?

ycwangxiang

maychang posted on 2018-6-21 16:00 Looking for a voltage regulator that allows input of -40~+40V and outputs about 5V -40~+40V, this range includes zero. How can it output 5V if the input is zero?

-40V~40 is not a normal operation, but the back-end circuit can be intact between -40~40, and it can work normally at 6.5V

maychang

ycwangxiang posted on 2018-6-21 16:07 -40V~40 is not normal operation, but the back-end circuit can be intact between -40~40, and it can work normally at 6.5V

Input a rectifier bridge, then connect a LM317, and adjust the output voltage to the 6.5V you need. The maximum input voltage of LM317 is 40V. If you are not sure about LM317, you can consider using TL783, the maximum input voltage allowed is 125V.

maychang

ycwangxiang posted on 2018-6-21 16:07 -40V~40 is not normal operation, it just means that the back-end circuit will not be damaged between -40~40, and it can work normally at 6.5V

If you think the efficiency of the linear voltage regulator circuit is too low, you can only design a switching power supply that meets your needs by yourself.

qwqwqw2088

"I want to find a voltage regulator that can withstand 40° forward and 40° reverse." The voltage regulator selection is based on the voltage regulation value and the power. There is no reverse voltage regulation.