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An output voltage that is either too high or too low is not ideal. Today, let’s discuss the common issues related to handling a low output voltage. What problems can arise from an excessively low output voltage? It can prevent the entire system from functioning properly. To take an example from our daily lives, when the voltage is too low, bulbs either do not light up at all or glow faintly, which certainly fails to meet our needs. If the voltage remains too low for an extended period of time, it will reduce the service life of the power supply circuit. So how should we address this issue? One of the key parameters of a power supply module is the accuracy of the output voltage. Some engineers, when checking the voltage accuracy, find that the output voltage is slightly too low and does not meet the accuracy requirements specified in the technical specifications. What causes this? Is it an error in the testing methods or is the product itself defective? Usually, the elimination method can be used: assume first that the product is fine and conduct tests using the methods provided by the manufacturer. If the problem persists, it can be concluded that the defect lies with the product itself. Let’s analyze what causes the output voltage to be too low, so that appropriate measures can be taken. 1. The input voltage is too low or the output power is insufficient. 2. The output cable is too long or too thin, resulting in excessive wire loss. 3. The voltage drop of the reverse-blocking diode at the input side is too high. 4. The filter inductance entered is too large. How should people deal with these various reasons on the left and right? Let’s discuss some methods below. Increase the voltage or use a power supply with higher output; adjust the wiring by increasing the cross-sectional area of the wires or reducing their length to lower the internal resistance; use diodes with a lower forward voltage drop; reduce the value of the filtering inductor or decrease its internal resistance.