US Patent No. 10,716,186

DRIVING CIRCUIT USING BUCK CONVERTER CAPABLE OF GENERATING SUFFICIENT VOLTAGE TO POWER A LED CIRCUIT AND ASSOCIATED AUXILIARY CIRCUITRY IN A NORMAL MODE OF OPERATION, AND INSUFFICIENT TO POWER THE LED CIRCUIT BUT SUFFICIENT TO POWER THE ASSOCIATED AUXILIA


Patent No. 10,716,186
Issue Date July 14, 2020
Title Driving Circuit Using Buck Converter Capable Of Generating Sufficient Voltage To Power A Led Circuit And Associated Auxiliary Circuitry In A Normal Mode Of Operation, And Insufficient To Power The Led Circuit But Sufficient To Power The Associated Auxilia
Inventorship Akshat Jain, Nahan (IN)
Ranajay Mallik, Ghaziabad (IN)
Assignee STMicroelectronics International N.V., Schiphol (NL)

Claim of US Patent No. 10,716,186

1. A circuit, comprising:a voltage converter configured to convert a source voltage to a supply voltage at a first node as a function of a feedback voltage at a feedback node;
a first output path coupled between the first node and a second node;
feedback circuitry configured to selectively couple the second node to the feedback node; and
impedance circuitry coupled between the first node and a third node and configured to generate an auxiliary supply voltage and an auxiliary ground voltage, the auxiliary supply voltage being less than the supply voltage.