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Abstract ▼ AI-Helper

In this paper, a step-up DC-DC converter, which has PFM(Pulse Frequency Modulation) mode that switching frequency changes according to output electric current condition, is designed. In case of switching type voltage regulator, the switching loss occupies most of the power dissipation, therefore, ON...

In this paper, a step-up DC-DC converter, which has PFM(Pulse Frequency Modulation) mode that switching frequency changes according to output electric current condition, is designed. In case of switching type voltage regulator, the switching loss occupies most of the power dissipation, therefore, ON/OFF switching of built-in power switch should be minimized and its efficiency should be enhanced for low power operation. The designed converter circuit has output detection Amp(comparator) which detects output voltage stably and controls built-in power switch, reference return trip that makes internal reference voltage, and internal oscillator. The control power switch with current protection return trip and high resistance chain for output voltage control are included internally. Built-in power transistor for voltage step-up makes it possible to minimize the number of external parts. And because output voltage is fixed using internal trimming without separate external resistor for output voltage control, simple system design is also available. Output voltage also can be controlled using external ON/OFF control pin, and the electric current consumption is designed to be very small fewer than 1㎂ during IC shutdown period. Output voltage and switching characteristics of designed chip are very stable, and the output-driving standby power is about 8.8㎂.

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