Firstly, this paper introduces the advantages and disadvantages of current technology scheme for realizing ideal diode, and it improves the scheme to design an ultra-low loss ideal diode control circuit, which consists of a PMOS main transistor, a PMOS auxiliary transistor, and two bias resistors. It is preferable to use an integrated PMOS auxiliary transistor with the same parameters and packaged together along with two bias resistors to form a comparison circuit, which controls the conduction and cutoff of the PMOS main transistor. When the input voltage VCC is not less than the output voltage Vout, the PMOS main transistor conducts. On the contrary, the PMOS supervisor cuts off to prevent Vout current from flowing back into the VCC and protect the front-end circuit of the VCC power supply. The advantage of this design is that the circuit has the function of preventing backflow, which can protect the front-end circuit. The entire circuit has very low static current loss. The combination logic comparison circuit is simple, low-cost, and highly practical.
ultra-low lossideal diodePMOS auxiliary transistorreverse current
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