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Integrator for providing overshoot protection and light switching mode during non-zero load condition for an led driver circuitry

A no-load state, circuit technology, applied in the direction of lamp circuit layout, instruments, electric light sources, etc., can solve problems such as circuit overvoltage state

Inactive Publication Date: 2011-06-01
INTERSIL INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This creates various problems within the voltage regulator, including overvoltage conditions in circuits supplied by the regulator

Method used

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  • Integrator for providing overshoot protection and light switching mode during non-zero load condition for an led driver circuitry
  • Integrator for providing overshoot protection and light switching mode during non-zero load condition for an led driver circuitry
  • Integrator for providing overshoot protection and light switching mode during non-zero load condition for an led driver circuitry

Examples

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Embodiment Construction

[0022] Referring now to the drawings, in which like reference numerals are used to represent like elements throughout, there is shown and described a GM amplifier for providing overshoot protection and optical switching mode during non-zero load conditions of an LED driver circuit. Figures and examples, and other possible implementations are described. The drawings are not necessarily to scale and in some instances the drawings have been exaggerated and / or simplified in places for illustrative purposes only. Those skilled in the art will understand that there are many possible applications and variations based on the following examples of possible implementations.

[0023] LED drivers are used in various applications to drive LEDs. Multi-channel LED drivers can be used to drive multiple strings (ie, multiple channels) of LEDs for various applications such as backlighting. Existing LED drivers have problems providing sufficient headroom for the LED string and also experience ...

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PUM

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Abstract

The invention provides an integrator for providing overshoot protection and light switching mode during non-zero load condition for an LED driver circuitry. A voltage regulator system comprises circuitry for generating a regulated output voltage responsive to an input voltage and switching control signals. A voltage divider is connected to an output node of the circuitry to provide a way to monitor the output voltage. A voltage regulator controller generates the switching control signals responsive to the monitored output voltage and a reference voltage. A compensation network is associated with the voltage regulator controller. The voltage regulator controller further controls the circuitry for regulating an output current pulse for the regulated output voltage responsive to an indication that the monitored output voltage is below a reference voltage in the no-load condition without interaction with the loop compensation network. The voltage regulator controller further selectively associates the compensation network with the voltage regulator controller responsive to a load condition and selectively disconnects the compensation network from the voltage regulator controller responsive to a no-load condition.

Description

[0001] Cross References to Related Applications [0002] This application is a continuation-in-part of U.S. Patent Application Serial No. 12 / 492,748, entitled "DYNAMIC HEADROOM CONTROL FOR LCD DRIVER," filed June 26, 2009, and claims the September 28, 2009 Submit the U.S. provisional application titled "INTEGRATION FOR PROVIDING OVERSHOOT PROTECTION ANDLIGHT SWITCHING MODE DURING NON-ZERO LOAD CONDITIONS FOR AN LED DRIVER CIRCUIT" Priority to Patent Application No. 61 / 246,433, which is hereby incorporated by reference. technical field [0003] The present invention relates to LED driver circuits, and more particularly, to LED driver circuits including integrators for providing overshoot protection and lamp load switching modes of operation. Background technique [0004] LED drivers are used in various applications to drive LEDs. Multi-channel LED drivers can be used to drive multiple strings of LEDs used in various applications such as backlighting. Existing LED drivers e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02H02M3/156
CPCH05B33/0827H05B33/0887Y02B20/341H05B33/083H05B33/0818H05B45/50H05B45/46Y02B20/30H05B45/3725H05B45/38H05B45/347G05F1/10H05B45/48
Inventor N·I·阿奇博尔德
Owner INTERSIL INC