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LED driver controller, LED driver and LED driving method

A technology of LED driver and controller, which is applied in the field of LED driver controller, can solve problems such as burning, uneven heat distribution, and temperature rise of LED driver controller, so as to solve the problem of temperature rise and reduce uneven heat distribution or heat loss. cumulative effect

Active Publication Date: 2017-01-18
IWATT INTEGRATED CIRCUITS TECHNOLOGY (TIANJIN) LIMITED
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Problems solved by technology

[0008] This specification aims to provide an LED driver controller, LED driver and LED driving method, which can solve the problems caused by uneven heat distribution or heat accumulation on the LED driver controller composed of multiple channel regulators in the related art. The problem that the temperature of the drive controller rises or even burns out

Method used

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  • LED driver controller, LED driver and LED driving method
  • LED driver controller, LED driver and LED driving method
  • LED driver controller, LED driver and LED driving method

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Embodiment Construction

[0031] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0032] Down figure 2 Details the uneven heat distribution or build-up of heat on the LED driver controller due to manufacturing variations between LEDs when scaling across many LED strings.

[0033] figure 2 is a schematic representation of the exponential relationship between the voltage and current of two different LEDs according to an embodiment of the present invention Figure 1 ,Such as figure 2 As shown, assuming a current setting of 40mA in each LED string, LED1 must operate at a forward voltage drop of approximately 2.95 volts, while LED2 must operate at a forward voltage drop of approximately 3.26 volts. Therefore, there is a difference of approximately 0.31 volts between the fo...

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Abstract

The invention discloses an LED driver controller, an LED driver and an LED driving method. The LED driver controller comprises a plurality of terminals (411 and 414) which can be connected with a plurality of LED strings respectively. For each LED string (42), the LED driver controller further comprises channel regulators (412 and 415) which can regulate currents passing through the LED strings (42) according to the detection voltages of the corresponding LED strings, and a first transistor (413) which can turn on or off the LED strings (42) according to first duty ratio signals, wherein the first duty ratio signals are determined based on currents regulated by the channel regulators (412 and 415). The problem of temperature rising of the LED driver controller can be solved.

Description

technical field [0001] The embodiments of the present invention relate to the field of LED driving, and in particular to an LED driver controller, an LED driver and an LED driving method. Background technique [0002] Light Emitting Diodes (LEDs for short) are widely used in a variety of electronic applications, such as architectural lighting, automotive head and tail lights, backlights for liquid crystal display devices including personal computers and high-definition televisions, and flash lights. Compared with conventional light sources such as incandescent lamps and fluorescent lamps, LEDs have significant advantages such as high efficiency, good directionality, good color stability, high reliability, long life, small size, and environmental safety. [0003] In order to drive a large LED array with a direct current (DC) voltage source, a DC-DC switching power manager such as a boost, buck, or buck-boost manager is often used to provide multiple The LED string provides t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B37/02
Inventor 邓广来王乃龙
Owner IWATT INTEGRATED CIRCUITS TECHNOLOGY (TIANJIN) LIMITED
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