Stable Time Reduction by LDO in PWM Switching Buck Converter

In this paper, the proposed voltage mode buck converter senses. The output voltage is compared with the reference voltage, and the error voltage is amplified by the error amplifier. Finally, through the PWM signal to achieve the circuit regulator effect. Compared with the current mode buck converter, the voltage-mode buck converter has better noise margin, low impedance power output and single feedback loop, making design and circuit analysis easier. The addition of the LDO circuit allows the buck converter to reach a stable voltage faster and turn off the LDO after the buck converter is stable to reduce unnecessary power waste.