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What is a PWM switching regulator?

PWM regulator switching
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What is a PWM switching regulator?

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In a PWM switching regulator (Figure 1), the input voltage is fed back to a PWM controller that varies the length of time the power switch is on (duty cycle) to keep the output voltage constant. Output MOSFETs for switching regulators may be either integrated (on-chip) or external to the IC.

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