ADAPTIVE TURN-OFF DELAY TIME COMPENSATION FOR LED CONTROLLER

Title:

ADAPTIVE TURN-OFF DELAY TIME COMPENSATION FOR LED CONTROLLER

Document Type and Number:

WIPO Patent Application WO/2018/119819

Kind Code:

A1

Abstract:

A light emitting diode controller (62) integrated circuit includes counter circuitry (79) having inputs coupled to a clock signal input pin (66), a pulse width modulated signal input pin (42), and a sense input pin (64), and has a count output (80) coupled to a gate drive signal output (40) to an external power transistor (18). The power transistor (18) is connected in series between a power lead (12), a sense resistor (16), and a light emitting diode (20, 22, 24). The sense input pin (64) is coupled to the series connection between the resistor (16) and the transistor (18). The counter circuitry (79) provides a Ton_delay equal to a Toff_delay of the power transistor (18). By counting up during a Ton_delay and down during a Toff_delay, the controller can be used with power transistors of unknown characteristics.

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Inventors:

ZHANG RUOCHEN (CN)
MA QINGJIE (CN)
SHI MINWEN (CN)

Application Number:

PCT/CN2016/112870

Publication Date:

July 05, 2018

Filing Date:

December 29, 2016

Export Citation:

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Assignee:

TEXAS INSTRUMENTS INC (US)
TEXAS INSTRUMENTS JAPAN LTD (JP)

International Classes:

H05B37/02; H05B44/00

Domestic Patent References:

WO2014030895A1	2014-02-27
WO2014116100A1	2014-07-31

Foreign References:

CN102573222A	2012-07-11
CN104540292A	2015-04-22
CN105592605A	2016-05-18
US20110227496A1	2011-09-22
US20120104964A1	2012-05-03
US20140159614A1	2014-06-12

Other References: