What is the output voltage accuracy of the primary feedback power supply?

1%。 The internal feedback loop of the module power supply obtains a certain value through the voltage dividing resistor at the output end and compares it with the reference power supply of the comparator, so as to adjust and control the output voltage to reach the set value. The error accumulation of voltage divider resistance and comparator voltage accuracy will determine the accuracy of output voltage. Generally, if the accuracy of the nominal output voltage is 1%, the accuracy of the voltage divider resistor is 1‰, and the accuracy of the reference voltage is 0.5%. Otherwise, the voltage stabilization accuracy of 1% cannot be guaranteed.