SWITCH CONTROL CIRCUIT AND BUCK CONVERTER INCLUDING THE SAME
First Claim
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1. A switch control circuit for a power switch and a synchronous switch that are connected to an inductor, the switch control circuit comprising:
- a comparator configured to compare a detection voltage obtained by detecting an inductor current flowing through the inductor with a predetermined reference voltage;
a delay unit configured to delay an output of the comparator by a zero voltage delay time; and
a zero voltage delay calculation unit configured to calculate the zero voltage delay time based on at least an ON time of the power switch and a delay time,wherein the delay time is determined based on the inductor and parasitic capacitors of the power switch and the synchronous switch.
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Abstract
A buck converter includes a power switch having one end to which an input voltage is transferred, a synchronous switch connected between the other end of the power switch and the ground, an inductor having an end connected to the other end of the power switch, and a switch control circuit configured to calculate a zero voltage delay time based on at least an ON time of the power switch and a delay time. The delay time is determined based on the inductor and parasitic capacitors of the power switch and the synchronous switch.
12 Citations
20 Claims
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1. A switch control circuit for a power switch and a synchronous switch that are connected to an inductor, the switch control circuit comprising:
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a comparator configured to compare a detection voltage obtained by detecting an inductor current flowing through the inductor with a predetermined reference voltage; a delay unit configured to delay an output of the comparator by a zero voltage delay time; and a zero voltage delay calculation unit configured to calculate the zero voltage delay time based on at least an ON time of the power switch and a delay time, wherein the delay time is determined based on the inductor and parasitic capacitors of the power switch and the synchronous switch. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A buck converter comprising:
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a power switch having one end to receive an input voltage; a synchronous switch connected between a second end of the power switch and the ground; an inductor having an end connected to the second end of the power switch; and a switch control circuit configured to calculate a zero voltage delay time based on at least an ON time of the power switch and a delay time, wherein the delay time is determined based on the inductor and parasitic capacitors of the power switch and the synchronous switch. - View Dependent Claims (17, 18, 19, 20)
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Specification