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SMPS is a power supply unit PSU for electronic use that contains a switching regulator. While a linear regulator maintains the desired output voltage by dissipating excess power in a "pass" power transistor, the SMPS switches a power transistor at the faster rate between saturation full on and cutoff completely off with a variable duty cycle whose average is the desired output voltage. This process gives rectangular waveform as a result which is filtered by a low-pass filter with using inductor and capacitor