MOS transistorIn DC power supplies, it is mainly used as a switching element for efficient control of energy transmission and voltage regulation. The following are its core functions:

switch control

InDC-DC converter(such asBuck voltage reduction、Boost Boost）In MOS transistors, the output voltage is regulated by high-frequency conduction and turn off, reducing switching losses and improving efficiency. Its fast switching characteristics (nanosecond level) support high-frequency operation (tens of kHz to MHz), allowing the use of smaller magnetic components (such as inductors and transformers), reducing power supply volume and cost.

synchronous rectification

InSynchronous Buck CircuitIn China, MOS transistors replace traditional onesrectifier diodePerform secondary rectification and significantly reduce conduction losses by utilizing low on resistance (RDS (on)), especially suitable for low voltage and high current scenarios.

Power Factor Correction (PFC)

InPFC circuitIn MOS transistors, the input current waveform is adjusted to be in phase with the voltage, reducing harmonic interference and improving power factor.

Voltage stabilization and protection

MOS transistor coordinationcontroller(such as PWM chips) achieve precise voltage regulation, while preventing device damage through overcurrent and overvoltage protection circuits. InLDO voltage regulatorIn China, its high input impedance characteristics help stabilize the output voltage. ‌‌

Reverse current blocking

In the power path, MOS transistors can prevent current backflow and protect sensitive components (such as...)USB OTGIn applicationVBUS isolation）.