Invention Grant
US08400080B2 Pulse width modulation (PWM) closed loop LED current driver in an embedded system
有权
嵌入式系统中的脉宽调制（PWM）闭环LED电流驱动器
- Patent Title: Pulse width modulation (PWM) closed loop LED current driver in an embedded system
- Patent Title (中): 嵌入式系统中的脉宽调制（PWM）闭环LED电流驱动器
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Application No.: US13171161Application Date: 2011-06-28
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Publication No.: US08400080B2Publication Date: 2013-03-19
- Inventor: Li-Quan Tan , Wing Kong Low , Thai La
- Applicant: Li-Quan Tan , Wing Kong Low , Thai La
- Applicant Address: US CA Cupertino
- Assignee: Apple Inc.
- Current Assignee: Apple Inc.
- Current Assignee Address: US CA Cupertino
- Agency: Womble Carlyle Sandridge & Rice LLP
- Main IPC: G05F1/00
- IPC: G05F1/00 ; H05B37/02 ; H05B39/04 ; H05B41/36
Abstract:
Methods and systems for providing stable and accurate low noise DC reference voltage are described. In the described embodiments, a feedback controlled DC reference voltage supply provides a stable and well controlled sense current. The sense current is in turn used to produce a stable and well controlled light output from a light emitting diode (LED).
Public/Granted literature
- US20110254464A1 PULSE WIDTH MODULATION (PWM) CLOSED LOOP LED CURRENT DRIVER IN AN EMBEDDED SYSTEM Public/Granted day:2011-10-20
Information query
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