Classification of linear regulators
Classified by function
When linear regulators are classified by function, they can be divided into two types: positive voltage and negative voltage.
Depending on the circuit used, there are products that do not require a positive power supply but a negative power supply.
If there is only a positive side power supply, it cannot handle voltages below the ground potential, and cannot distribute the voltage of the output pin of the transistor to a negative level. Load the control transistor into the negative output line to generate a negative voltage.
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