Invention Grant
- Patent Title: Maintaining LED driver operating point during PWM off times
-
Application No.: US15147834Application Date: 2016-05-05
-
Publication No.: US09642200B2Publication Date: 2017-05-02
- Inventor: Joshua William Caldwell , Dongwon Kwon , Lucas Andrew Milner
- Applicant: LINEAR TECHNOLOGY CORPORATION
- Applicant Address: US CA Milpitas
- Assignee: Linear Technology Corporation
- Current Assignee: Linear Technology Corporation
- Current Assignee Address: US CA Milpitas
- Agency: IntelleTek Law Group, PLLC
- Main IPC: H05B37/00
- IPC: H05B37/00 ; H05B33/08

Abstract:
A method and system of driving an LED load. There is a power stage that is configured to deliver a level of current indicated by a control signal to the LED load when a PWM signal is ON and stop delivering the level of current when the PWM signal is OFF. There is a feedback circuit that is configured to generate the operating point signal, which causes the power stage to deliver a level of current indicated by the control signal, when the PWM signal is ON. A store and hold circuit is configured to store an information indicative of a level of the operating point signal just after the PWM signal is turned OFF and cause the operating point signal to be at that level just before the PWM signal is turned ON.
Public/Granted literature
- US20160353537A1 MAINTAINING LED DRIVER OPERATING POINT DURING PWM OFF TIMES Public/Granted day:2016-12-01
Information query