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Simple implementation of a reliable negative power supply with BUCK Buck circuit?
Date:June 29, 2025    Views:14

    In applications that require very high signal linearity amplification, dual power amplifier is needed, such as high-precision measuring instruments, meters, etc. Then it is necessary to provide positive and negative power to the dual power amplifier.

    Our common BUCK buck circuit can get a positive voltage, as shown in Figure 1.

Figure 1: BUCK Buck circuit positive voltage output
    In fact, the BUCK buck circuit can transform the negative voltage with the same output capacity as the positive voltage without changing the component parameters, as shown in Figure 2. Its working principle is the same as the positive voltage output, and the obtained power quality is also very high.


Figure 2: BUCK buck circuit negative voltage output
    The component models of the above two circuit diagrams are correct and can be used directly.
    In addition, the negative pressure charge pump composed of capacitors, diodes and oscillators can also achieve negative voltage, because the presence of diodes will lose a part of the voltage drop, easy to be affected by load and ripple, output capacity is limited, it is recommended not to use high quality requirements of the power supply.







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