Patent ID: 11864282
Assignee: ROHM CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A light emitting element driving device, comprising:
an external terminal, configured to connect to a first terminal of a light emitting element;
a constant current circuit, connected to the external terminal; and
a current detection unit, configured to detect a current flowing through the constant current circuit, wherein
the current detection unit includes:
a first transistor, including a first end, a second end and a control end connected to the external terminal;
a current setting resistance, connected to the second end of the first transistor; and
a drive amplifier, including:
a first input end, connected to a first node to which the first transistor and the current setting resistance are connected;
a second input end, to which a current set voltage is applied; and
an output end, connected to the control end of the first transistor, and wherein

the current detection unit converts the current flowing through the light emitting element into a voltage signal based on a feedback voltage generated in the first node, and generates a current detection signal.