Highpower led driver features multiple dimming control modes. A feedback controller monitors the tail voltages of the led strings to identify the minimum tail voltage and adjusts the output voltage based on the lowest tail voltage. The dynamic headroom control feature monitors the forward voltages of the led strings and dynamically adjusts the led supply voltage through the power supply feedback to the lowest level required. Powerefficient cispr25 class3 compliant led driver with. This part functions as a linear led driver with increased efficiency by adding tailored dynamic headroom control to. Powerefficient cispr25 class3 compliant led driver with dynamic. Output voltage up to 60v, with dynamic headroom control 2. Additionally, the dynamic headroom control dhc output can be interfaced to the external power supply to adjust the led supply voltage to the lowest level that is adequate to maintain all the string currents in regulation, yielding the optimal overall efficiency. In addition, the system includes a special feature of dynamic headroom control dhc that aims at maximizing overall system efficiency by adjusting voltage at the boost controller by sensing the leds. Normally, the forward voltage of an led drops as the ambient temperature increases. The led current is programmable from 50 ma to 200 ma by a single resistor. To maximize the efficiency, dynamic headroom control dhc automatically adjusts the led driving voltage to a minimum level.
National semiconductor introduces led driver with dynamic. Dynamic headroom controller with thermal control interface and individual channel dimming control general description the lm3463 is a six channel linear led driver with dynamic headroom control dhc interface that is specialized for high power led lighting applications. The lm3463, a sixchannel led driver from ti featuring dynamic headroom control for highpower applications, is being touted as the industrys first wideinput. Lm3464, lm3464a 1features description the lm346464a is a 4channelhigh voltage current 2 wide input voltage range. Technical features of nationals lm3464 led driver the lm3464 is a highvoltage current controller with four individual current regulator channels. Using dynamic headroom control for industrial lighting applications. The lm3464 is a linear led driver with dynamic headroom control dhc technology designed to drive four serial high power high brightness led strings. Texas instruments incorporated has introduced a sixchannel led driver with dynamic headroom control for highpower applications, which accurately and efficiently drives up to six strings of leds.
Us8049439b2 us12363,607 us36360709a us8049439b2 us 8049439 b2 us8049439 b2 us 8049439b2 us 36360709 a us36360709 a us 36360709a us 8049439 b2 us8049439 b2 us 8049439b2 authority. Interface and individual channel dimming control applications. Rt6032 4ch constant current led driver for display. Led driver offers dynamic headroom control suited for automotive lcd backlight applications, the lm3492 led driver offers dynamic headroom control. Lm3464 data sheet, product information and support. Add5201 high efficiency, eightstring, white led driver.
Led driver features dynamic headroom control power electronics. Boost output voltage up to 60v, with dynamic headroom control dhc. The lm3492 led driver with dynamic headroom control. Dualdrive excels in configurability and low dimming giving you every shade of white. Led driver with dynamic headroom control us8049439b2 en 20090.
The lm3463 works easily with readily available, standard constant voltage power supplies, or with customized acdc converters which can take advantage of dynamic headroom control for increased system efficiency. Nsm today announced the lm3492 led driver with dynamic headroom control that accurately and efficiently drives current to two independently dimmable strings of leds. Us8049439b2 led driver with dynamic headroom control. Snvs652f april 2010 revised may 20 led driver with dynamic headroom control and thermal control interfaces check for samples. Dualdrives two separately dali controllable led outputs are perfect for dynamic white lighting applications colour temperature control and intensity control or for luminaires that combine task and ambient lighting.
The design is cispr25 class3 emi compliant and supports iso 76372 and iso 167502 standards. Versatile controller maximizes system efficiency, simplifies design and reduces costsep 20, 2012. Design solution for automotive lcd displays utilizing led. The capacity of an amplifier to exceed briefly its normal power output to reproduce unusually strong signal bursts without distortion. Led current adjustable up to 30 ma for each channel. Led driver offers dynamic headroom control electronic. Dhc also facilitates a single bill of materials for different number of. The lm3492, a member of nationals powerwise energyefficient product family, maximizes system efficiency and reduces system complexity and cost in automotive lcd backlight applications. The isl97686 has an advanced dynamic headroom control function. The mc34844a is a high efficiency, led driver for use in backlighting lcd displays from 10 to 27. Three embedded mosfets reduce system complexity and cost. Lm3466 old version datasheet multistring led current balancer for use with constantcurrent power supplies. Lm3464a led driver with dynamic headroom control and.
The dynamic headroom control feature adjusts the led supply voltage through the boost converter feedback to the lowest level required to provide optimal system efficiency. Rt6033 4ch constant current led driver for display backlight. Jun 28, 2018 ti implemented dynamic headroom control by injecting voltage in the feedback network in the rgb signal light with iolink interface reference design for a stack light with 20 rgb leds and five tlc5971 led drivers. Lm3464 led driver with dynamic headroom control and. The lm3463, a sixchannel led driver from ti featuring dynamic headroom control for highpower applications, is being touted as the industrys first wide input. This is very handy as it can control up to 4 strings chips, and with its dhc it will assist in. The led current is programmable from 50 to 200 ma by a single resistor. Snvs807 may 2012 dynamic headroom controller with thermal. The rt6033 is a 4ch constant current sink led drivers with dynamic headroom control dhc function. Ti introduces the first wideinput voltage, highpower led. The lm3464 is a 4channel high voltage current regulator that provides a simple solution for led lighting applications. Rt6033 4ch constant current led driver for display. This training module will introduce lm3464 led driver with dynamic headroom control and its application circuit. The lm3464s dynamic headroom control feature dynamically adjusts the led supply voltage through the power supply feedback to the lowest level required to provide optimal system efficiency.
The rt8301 is a 8ch constant current sink led drivers with dynamic headroom control dhc function. Sep 17, 2009 techniques for dynamic headroom control in a light emitting diode led system are disclosed. Apr 26, 2010 the lm3464s dynamic headroom control feature dynamically adjusts the led supply voltage through the power supply feedback to the lowest level required to provide optimal system efficiency. The is a six channel linear led driver with dynamic headroom control dhc interface that is specialized for high power led lighting applications. Led driver features dynamic headroom control power. Dhc also facilitates a single bill of materials for different number of leds in a string, which is required for backlight panels of different size. The isl97686 is a pwm controlled led driver that supports. Connect this pin to the voltage feedback input of primary power supply to facilitate dynamic headroom control. The driver features dynamic headroom control that monitors the highest led forward voltage string to determine the requested boost output voltage. Dynamic headroom controllers dhc such as the lm3463, delivers accurately regulated current to leds while maximizing the system efficiency. Led driver offers dynamic headroom control electronic products. Ti introduces wideinputvoltage, highpower led driver.
Led driver with dynamic headroom control and thermal control interfaces 28htssop 40 to 125. Dynamic headroom definition of dynamic headroom by the free. Multistring led driver with accurate current matching and dynamic cancellation of forward voltage mismatch punith r. Driver for lcd backlight applications data sheet add5201. Led driver integrates dynamic headroom control electronic.
The nxp mc34845 is a high efficiency, led driver for use in backlighting. Surkanti, disha mehrotra, manaswini gangineni and paul m. And vvdhc is the voltage headroom which equals to the voltage at the vdhc pin. Txn today introduced a sixchannel led driver with dynamic headroom control for highpower applications, which accurately and efficiently drives up to six strings of leds. Operating from supplies of 7v to 28v, the mc34844a is capable of driving more than 150 leds in 10 parallel strings.
Lm3463 datasheet the lm3463 is a six channel linear led. Ti introduces wideinputvoltage, highpower led driver with. The lm346464a provides four individual current regulator channels and works in conjunction with external nchannel mosfets and sense resistors to give accurate driving current for every led string. Texas instruments incorporated has introduced a sixchannel led driver with dynamic headroom control for highpower applications, which accurately and. Led driver with dynamic headroom control suits highpower. The biggest cost reductions in leds today come from improvements in efficacy fewer leds needed for the same light output, and the lm3463 is no exception. Multistring led driver with accurate current matching and. Jun 14, 2017 this paper presents a powerefficient led driver. The lm3464 led driver is offered as the first of its kind with dynamic headroom control and multiple outputs for highpower applications. National semi introduces led driver with dynamic headroom. Add5201 high efficiency, eightstring, white led driver for. Led driver with dynamic headroom control for highpower applications national semiconductor corp. High power led driver read 5835 times 0 members and 1 guest are viewing this topic.
The lm3463 is a six channel linear led driver with 2 dynamic headroom control output to maximize efficiency dynamic headroom control dhc interface that is specialized for high power led lighting applications. Rt8301 8ch constant current led driver for display. Texas instruments six channel led driver with dynamic headroom control facilitates development of energy efficient, quality, high lumenoutput applications. It incorporates a feature called dynamic headroom control, which allows the lm3464 to regulate the current through the led string and monitor what the constant voltage is from the acdc power supply to optimize the solution and improve efficiency. Sep 27, 2010 the led current is programmable from 50 ma to 200 ma by a single resistor. Led driver with dynamic headroom control is industrys first. This led driver incorporates an independent current controlled driving mechanism for each of the leds, which allows accurate current control of the led brightness. The search for true, deep black in lcd displays is driving the transition from edgelit to fullarray led backlights. Lm3464 80v led driver with dynamic headroom control and. External voltage headroom control vdhc 5v 0v lm346464a lm3464, lm3464a. The as1 led driver is ideal for dotmatrix displays in mobile phones, personal electronic and toys. Sculpted for automotive lcd backlight applications, the lm3492 led driver with dynamic headroom control drives current to two independently dimmable strings of leds. Mar 23, 2011 welcome to the training module on an introduction to lm3464 led driver with dynamic headroom control. Lm3492 led driver with dynamic headroom control reduces.
Highly efficient led drivers provide optimal performance in general lighting applications and in led backlighting systems for large flat display panels. Unlike traditional highbrightness led drivers that drive current to each string independently, this led device includes four channels to drive up to 20 leds per channel, reducing system complexity and cost. Furth vlsi laboratory, klipsch school of electrical and computer engineering, new mexico state university, las cruces, nm 88003, usa. This part functions as a linear led driver with increased efficiency by adding tailored dynamic headroom control to each individual string voltage. Wideinput voltage led driver offers multiple dimming. Sep 27, 2010 the lm3492s dynamic headroom control feature dynamically adjusts the led supply voltage through the boost converter feedback to the lowest level required to provide optimal system efficiency. The lm3463 is a six channel linear led driver with dynamic headroom control dhc interface that is specialized for high power led lighting applications. Rt8301 8ch constant current led driver for display backlight. Led driver with dynamic headroom control is industrys. An output voltage is provided to drive a plurality of led strings.
Mc34844, 10 channel led backlight driver with integrated. Sep 21, 2012 the lm3463 by texas instruments is a sixchannel led driver with dynamic headroom control for highpower applications that accurately drives up to six strings of leds. The lm3463, a sixchannel led driver from ti featuring dynamic headroom control for highpower applications, is being touted as the industrys first wideinput voltage led driver with multiple. The lm3492, a member of nationals powerwise energyefficient product family, is said to maximize system efficiency and reduce system complexity and cost in automotive lcd backlight applications. Led streetlight driver solutions simplify design digikey. Led driver with dynamic headroom control us20100201279a1 en 20090209. Led driver with dynamic headroom control suits highpower applications. An introduction to lm3464 led driver with dynamic headroom. Ti implemented dynamic headroom control by injecting voltage in the feedback network in the rgb signal light with iolink interface reference design for a stack light with 20 rgb leds and five tlc5971 led drivers. Dynamic headroom definition of dynamic headroom by the. Lm3463 1features description the lm3463 is a six channel linear led driver with 2 dynamic headroom control output to maximize efficiency dynamic headroom control dhc interface that is specialized for.
Edn highpower led driver features multiple dimming control. The lm3463 by texas instruments is a sixchannel led driver with dynamic headroom control for highpower applications that accurately drives up to six strings of leds. The lm3463 is a wideinput voltage led driver with multiple dimming control modes that maximizes system efficiency and reduces complexity in led area. Nsm today announced the industrys first led driver with dynamic headroom control and multiple outputs for highpower applications that accurately and efficiently drives up to four strings of leds. Using dynamic headroom control for industrial lighting. Wideinput voltage led driver offers multiple dimming controls. The isl97698 offers 8bit linear or 11bit logarithmic controlled analog output. The dynamic headroom control technique can help reduce the high power dissipation of led signage and lighting applications using led drivers.
Led driver for use in backlighting lcd displays from 10 to 27. Welcome to the training module on an introduction to lm3464 led driver with dynamic headroom control. The new driver is a highvoltage current controller with four individual current regulator channels. Old version datasheet led driver with dynamic headroom control and thermal control interfaces. Lm3466 old version datasheet smart linear led driver for multichannel led systems. Techniques for dynamic headroom control in a light emitting diode led system are disclosed. The lm3492 led driver with dynamic headroom control introduced by national semiconductor 20100927 01.
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