US Patent No. 10,694,603

LED DRIVER CIRCUIT


Patent No. 10,694,603
Issue Date June 23, 2020
Title Led Driver Circuit
Inventorship Cristian Grecu, Munich (DE)
Bogdan-Eugen Matei, Munich (DE)
Angelo Bassi, Munich (DE)
Andrei-Cosmin Gaidam, Munich (DE)
Alessandro Molari, Eichenau (DE)
Assignee Apple Inc., Cupertino, CA (US)

Claim of US Patent No. 10,694,603

1. A circuit comprising:an amplifier having a first input coupled to receive a reference voltage and a second input coupled to receive a feedback voltage;
first and second transistors each having respective gate terminals coupled to an output of the first amplifier;
a first switch configured to, in a first mode, couple a source terminal of the first transistor to the second input of the amplifier responsive to receiving a pulse, and couple a source terminal of the second transistor to the second input of the amplifier in an absence of the pulse;
a third transistor having a source terminal coupled to a source terminal of the first transistor; and
a second switch configured to, in a second mode, couple a gate terminal of the third transistor to the output of the amplifier, and, in the first mode, couple the gate terminal of the third transistor to a ground node.