Invention Grant
- Patent Title: LED drive system for controlling an off-chip power supply
- Patent Title (中): 用于控制片外电源的LED驱动系统
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Application No.: US13829607Application Date: 2013-03-14
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Publication No.: US09265101B2Publication Date: 2016-02-16
- Inventor: Jonathan Kraft
- Applicant: ANALOG DEVICES, INC.
- Applicant Address: US MA Norwood
- Assignee: Analog Devices, Inc.
- Current Assignee: Analog Devices, Inc.
- Current Assignee Address: US MA Norwood
- Agency: Schwegman Lundberg & Woessner, P.A.
- Main IPC: H05B37/00
- IPC: H05B37/00 ; H05B33/08 ; H05B37/02

Abstract:
A LED drive system for controlling an off-chip power supply enables the power supply function to be located ‘off-chip’—i.e., on an IC which is separate from the IC containing the other LED drive system components. The off-chip supply provides a common line voltage for LED strings connected in series with respective current sink circuits at respective junctions, in response to a signal applied to a control input. The system includes a ‘minimum’ circuit which outputs the least of the voltages at the junctions, and an I/O pin which receives a signal that varies with the output of the minimum circuit. When the external supply's control input is coupled to the system's I/O pin, the present system controls the output of the external power supply as needed to provide a desired common line voltage.
Public/Granted literature
- US20140015426A1 LED DRIVE SYSTEM FOR CONTROLLING AN OFF-CHIP POWER SUPPLY Public/Granted day:2014-01-16
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