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US 9,520,770 B2Granted
Soft start circuit
AssigneeRohm Co., Ltd.
InventorsRyosuke Sumii, Kiminobu Sato
Life of this patent
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Abstract
A soft start circuit accepts an input of a reference voltage set arbitrarily, and generates a soft start voltage that takes a predetermined sweep time to slowly rise from a predetermined lowest value to a highest value that is higher than the reference voltage and changes in accordance with the reference voltage.
Claims8
A soft start circuit used in a power source apparatus, wherein
- the soft start circuit accepts an input of a reference voltage set arbitrarily, and generates a soft start voltage that takes a predetermined sweep time to slowly rise from a predetermined lowest value to a highest value that is higher than the reference voltage and changes in accordance with the reference voltage, and
- the soft start circuit comprises:
- a digital/analog converter that is supplied with the reference voltage as a power source voltage, and converts a digital sweep signal, which is increased at a constant period from a minimum value to a maximum value, into an analog sweep voltage, and
- a voltage amplification portion that amplifies the analog sweep voltage by using a predetermined gain and thereby generates the soft start voltage.
1 more element
Dependencies are inferred from the claim text.