In general, the module will perform a functional test before the board to verify that the voltage output of the module is normal. Power module output voltage, but the voltage is lower than the nominal output value is often encountered in the test process, the reason for this situation is nothing more than two, one is the power module is defective or damaged, the second is the use of the problem. The following describes the low power output of the power module caused by the usage method.
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1. The input power is low
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Low input voltage is the most easily ignored situation, when there is a problem with the output, we should first check whether the input is normal. For a PSU with a constant or wide voltage input, a low input value will result in a low output value. Of course, this case is limited, for a particular module, when the input voltage is too low will cause it to not work, no output voltage.