How to Detect a Universal Three-Terminal Integrated Voltage Regulator?
( 1 ) The circuit is electrified to test the three-terminal integrated voltage regulator connected to the human circuit, electrifying test, and measuring whether the output voltage is in accordance with the nominal value with a multimeter ( 5 % is allowed ) error ); when testing an adjustable integrated voltage regulator, you should adjust the adjustable resistance while the other side use the multimeter DC voltage to measure the DC input of the regulator, output Voltage.
When the adjustable resistor is transferred from the minimum to the maximum, the voltage Uo should be varied within the range of the nominal voltage given by the indicator parameter, if the output voltage is constant or the variation range deviates from the nominal voltage range, the regulator is damaged or has poor performance.
( 2 ) Use the multimeter to block the RX 1K block to measure the resistance between each foot, and compare it with the normal value, if the difference is not big, it shows that the performance of the voltage regulator is good. If there is a big difference between the resistance of the pin and the normal value, the performance of the voltage regulator is bad or it has been damaged. Judging whether there is a short circuit open circuit phenomenon.
This article is from Allicdata Electronics Limited.