DRIVE CIRCUIT FOR LIGHT-EMITTING ELEMENT, ACTIVE SENSOR, AND OBJECT IDENTIFICATION SYSTEM
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United States of America
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Issued Date -
Jan 16, 2025
app pub date -
Aug 29, 2022
filing date -
Aug 29, 2022
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Abstract
An input voltage VH of direct current is supplied to an input terminal IN, and an output terminal OUT is connected to a semiconductor light-emitting element 402. A half-bridge circuit 510 includes a high-side transistor MH provided between the input terminal IN and a switching node SW and a low-side transistor ML provided between the switching node SW and a ground terminal GND. A control circuit 530 controls both the high-side transistor MH and the low-side transistor LH to be in an on state during a first period T1 and only the high-side transistor MH to be in the on state during a second period T2 which follows the first period T1, in response to a light emission command S1 of the semiconductor light-emitting element 402.
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