As with the 78×× series integrated voltage regulator, there are two main methods for detecting a three-terminal adjustable integrated voltage regulator.
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1 Measure the resistance between the pins. Use the multimeter's electrical blocking to measure the resistance between the pins of the regulator and compare it with the normal value. If the input is small, the performance of the subtest regulator is good. If the resistance between the pins deviates from the normal value, the tested regulator is not performing well or has been damaged. The table lists the resistance values ​​of the LM317, LM350, and LM338 pins of the typical three-terminal adjustable integrated voltage regulator with a 500-type multimeter R×1k block for comparison.
Table LM317, LM350, LM338 resistance between each pin
2 power-up test method. According to the circuit connection, while adjusting the RP side, use the multimeter DC voltage block to measure the voltage value of the DC terminal of the regulator. When the RP is adjusted from the minimum value to the maximum value, the output voltage Uo should be changed within the nominal voltage adjustment range given by the index parameter. If the output voltage is constant or the variation range is significantly different from the nominal voltage adjustment range, then The regulator has been damaged or has poor performance.
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