Voltage Regulators

For any simple voltage regulator (excluding switchers etc.), Vin, must always exceed Vout, plus the internal transistor drops. The 30125, is only a high voltage regulator, so will require significantly more than 150v in to have any hope of working. The drop you have across the regulator seems slightly higher than I'd perhaps expect (14v), which may suggest there is more current being drawn than there should be.

Best Wishes

"onyxx" schreef in bericht news: snipped-for-privacy@g49g2000cwa.googlegroups.com... Can anyone tell me how do I find out the maximun and minimun voltages needed for a voltage regulator to work properly. I have this STR30125 that is suppose to put out a regulated 125Vdc, but what is the Vin suppose to be? This VR is giving out 83Vdc, which is not correct, but I donn´t know if it is recieving the proper voltage, which is 97Vdc. I have downloaded the datasheet, but it seems that this VR is very old and the datasheet is very short on info... Thanks...

Saw a datasheet as well. This type has a fixed output voltage of 125V. So the input voltage should never become

"onyxx" wrote in news:1128436173.066681.310160 @g49g2000cwa.googlegroups.com:

Data sheet: