Led driver ic for lighting applications stmicroelectronics. The hv9931 led driver is primarily targeted at low to medium power led lighting applications where galvanic isolation of the led string is not an essential requirement. Faq power factor of led lighting power factor indicates the ratio of real power watts used by the load to apparent power voltage x current drawn into the circuit. This solution is normally only selected in low power led driver applications. Lm3450a led drivers with active power factor correction. Low power acdc solutions are also available in for use with smart lighting to power auxiliary and standby. High power factor and low total harmonic distortion pf 0. Hv9931 display and led drivers general purpose led drivers. Power factor tells you how much of a real power load the driver puts on the electrical network.
Compact high power factor low thd buck led driver ic. Low pf leads to more significant power loss in utility lines and led drivers must therefore meet pfc standards. However, choosing a large value for c1 will result in pulse shaped input currents, leading to poor power factor and the line current i in will have high harmonic distortion. Power integrations offers a broad range of led driver ic for the indoor commercialresidential applications such as office lighting, hospitality lighting, led tubes, alamps, and par and br lamps, encompassing power outputs from 2 to 400 w. Low voltage transformers supply different levels of current when the line voltage on the input side fluctuates or when there are power surges. Cpc9909 is a low cost, highefficiency, offline, highbrightness hb led driver manufactured using our high voltage bcdmos on soi process. Power factor power factor describes how efficiently an led driver uses electricity. The power factor is a measurement of how much energy is converted to useful power in the led driver. Low power acdc solutions are also available in for use with smart lighting to power auxiliary and standby power. Power factor indicates the ratio of real power watts used by the load to apparent power voltage x current drawn into the circuit. Billion f2 100 led driver series features high voltage low current output, universal voltage90295vac input, ip67 dust and water resistant aluminum exterior, high efficiency, high pf value and 4kv surge protectioniec 645, which can operate normally in the severe environment from 4060 c. Longlasting and lowmaintenance, ledbased light sources are an excellent xi220c105v210cna1 solution for all outdoor lighting applications. The series supports a variety of outdoor applications including street light, industrial. Powi, the leader in highefficiency, highreliability led driver ics, announced the lytswitch6 family of safetyisolated led driver ics for smart lighting applications.
Low power acdc solutions are also available in for use with smart lighting to power auxiliary and standby power supplies. The ncl30000 is a switch mode power supply controller intended for low to medium power single stage power factor pf corrected isolated flyback led drivers. The goal is to develop an led driver with input current in. This wide input operating voltage range enables the driver to be used in a broad range of hb led applications.
Der657 45 w high power factor, isolated flyback with switched valley fill pfc led driver using lytswitch6. Leds are very sensitive to overcurrents and can rapidly overheat and burn out during current fluctuations. Highpower factor flyback converter for an led driver with. Oct 18, 2012 led replacement lamps look superefficient on payback charts and utility bills, but they may be sucking more power than you realize. Input, 700 ma constant current, 816vdc output, high power factor, forward phase dimming 100% 5% 4. Dimmable low voltage led driver class 2 ltf technology. For example and very simply, a typical 100w led luminaire with a power factor pf of 0. Aug 07, 2018 i just measured 3 led bulbs using 122.
With two independent channels this driver allows the user to get much more than 100w in a compact form factor, while still complying with class 2 limits. Highest efficiency of up to 94 percent by resonant topology, a thd factor less than 3. It employs a critical conduction mode crm control technique to ensure near unity power factor across a wide range of input voltages and output power. The light emitting diodes are low energy, lighting devices with a long lifespan and low energy consumption, hence the requirement for specialized power supplies. The power factor of a load, such as a fluorescent ballast or led driver. The influence of led lighting sources on the nature of power factor. The range for power factor is a decimal between 0 and 1. Der754 29 w high power factor isolated flyback led driver with 3in1, dali dimming and cct toggle. Pfc power factor correction x efficiency gives a number which if you then divide the output power in this example we will use a 90w light source by the pfc x eff gives the output va watts in principle. For higher power ratings and larger feature sets, dualstage topologies with a dedicated stage for power factor correction pfc and a dedicated stage for flyback or llc are common. The philips advance xitanium led outdoor driver portfolio offers a range of products. The fl7733a is a highlyintegrated pwm controller with advanced primaryside regulation psr technique to minimize components in lowtomidpower led lightin. Factoring in the effect of power factor, the current drawn from the mains supply will be 0. We offer solutions ranging from 40 w to 400 w to specifically address high power lighting needs.
Snvs681d november 2010 revised may 20 led drivers with active power factor correction and phase dimming decoder check for samples. In addition, the proposed technique ensures a high pf and low thd at any dimming level. An led driver is a self contained power supply which regulates the power required for an led or array of leds. Therefore, if we had an electrical circuit designed for a 6 amp circuit breaker, 65 led fixtures with a 0.
Minimizing light flicker in led lighting applications. Common questions and answers about led driverspower supplies. A highefficiency dimmable led driver for lowpower lighting. It employs a critical conduction mode crm control technique to ensure near unity power factor across a. Departments of electric drivers and energy conversions, faculty of electrical. Universal high power factor dimmable led driver controller. The power factor of mean wells led power supply operating at led load will be lower than at general load, and the total vf level of led in series will also affect power factor. An integrated highvoltage startup circuit implements fast startup and high system efficiency.
Led replacement lamps like this one from cree have a high power factor. High driver efficiency enables very high system efficacies. For optimal performance, these solutions require reliable drivers matching the long lifetime of the leds. The driver provides near unity power factor and constant current regulation using a two stage topology driven by a single mosfet and control ic.
Lm3450 1features description the lm345050a is a power factor controller pfc. Utilitech 9w 750 lumge 10w 760 lumfeit 7w 450 lum current. Ucc28811 data sheet, product information and support. Ip rating ip 44 class class 2 power supply dimming 010v. Low profi le, small form factor, junction box mountable flicker free dimming and excellent dimming range class 2 power supply and other than class 2 options e. L t f dimmable low voltage led driver class 2 efficiency higher than 85% power factor 95% case tc 90c max. Small electronic bill of materials bom enabling a compact solution and a small, single layer printedcircuit board pcb footprint. Apr 18, 2019 im not certain about this but very cheap led drivers incorporate a capacitor on the ac side to limit current through reactance less heating than a resistor the output current is then fed into a bridge rectifier before being further limited by a. A load with low power factor draws more current over a load with a high. High powerfactor led driver converts ac input to power. If the power factor is 0, the driver is not using any of the incoming electricity. Powerled how can i calculate the gear loss of my driver. Led driver xitanium specifications wiring diagram 220w 120277v 1. Redisem llc led drivers offer the performance of a 2stage converter at the price point of a 1stage unit.
Analysis and experimentation on a new high power factor off. The design of the driver circuit hence gets crucial in determining the. Redisems patented ppfc delivers excellent power factor correction in a single stage llc converter while offering accurate dc output with ripple well below 1% resulting in no led flicker. The closer to 1 the power factor is, the more efficient the driver is. While having a low power factor may seem harmless, it is largely accounted for at the electrical power plant. The driver is implemented by using an interleaved capacitor, which is placed between the rectifier and the integrated buck flyback converter ibfc. Analysis and experimentation on a new high power factor. It is calculated by dividing the power being used by the driver wattage divided by the product of the input voltage times the current going in volts x amps. It is designed for controlling a flyback, buck or boost converter operating in critical conduction mode. Espen led driver, vel12035120h3ca constant current. Or put the another way the luminaire is using 18% more electricity. Driving led strings from a rectified mains supply, high power factorlowthd. Compact high power factorlow thd buck led driver ic.
Espen led driver, vel12035120h3ca constant current, 350ma, max. Espen led driver, vel12035120h3ca constant current, 350ma. Ideal for both parallel and series configurations, our led driver portfolio enables highefficiency, highcurrent accuracy, lownoise and smallsize solutions. This creates voltage and current input waveforms with a large phase shift and a very low power factor. This paper presents a high power factor pf, low total harmonic distortion thd light emitting diode led driver with dimming capability. An improved pulsewidth modulation dimming technique is studied for regulating the led current and brightness. Most of the cheaper or the poorly designed ones have a low power factor roughly. Average current modulation is a simple control scheme that required a single low voltage mosfet and same led output voltage rate to ensure the zero low frequency current ripple for led load. Under universal input voltage operation, high efficiency and high power factor can be achieved by a coupled inductor singleended. The new ics deliver flickerfree output up to 65 w, and feature up to 94% efficiency and as little as 15 mw standby power, with configuration options for twostage or single. Compact high power factorlowthd buck led driver ic. In led luminaires, poor power factor is a consequence of poor circuit design in the drivers controlling the leds. Options for the integrated mosfet allow for 300v to 650v drain voltages and 1a to 4a.
Many low wattage leds in the domestic range have no power factor correction. Ssl5031cdb1210 18 w universal nonisolated buck led driver demo board. Led drivers regulate the current to make sure it stays below the danger values for the led. If power factor isnt mentioned in a driver specification, it implies. Power integrations offers led driver ics for outdoor commercial output applications including parking garages, path lighting, wall scones, spotlights, low bay, and street lighting. Input, 700 ma constant current, 816vdc output, high power factor, forward phase dimming 100% 5%. Dec 16, 2019 this can be easily calculated and uses information that should be readily available on the data sheet for your driver. Low power and costsensitive led lighting applications usually turn to singlestage flyback topology. Topologies include buck regulator, boost regulator, offline led drivers, linear led supply, programmable multichannels with high dimming capability. This can be easily calculated and uses information that should be readily available on the data sheet for your driver. Power factor correction pfc is critical to led driver selection as leds, which have a low pf, draw greater current loads than higher pf loads. By minimizing turnon time fluctuation, high power factor and low thd over the universal line range are obtained in the fl7733a.
An led driver is an electrical device that regulates power to an led or a string of leds. Der742 42 w low profile high power factor isolated flyback with switched valleyfill pfc dimmable led power supply. Using one is very important in preventing damage to your leds as the forward voltage v f of a high power led changes with temperature. Therefore, it is a better design to set the total vf in led luminaries close to the rated output voltage of the power supply. The ucc28810 and ucc28811 are general lighting power controllers for low to medium power lumens applications requiring power factor correction and emc compliance. A low power factor therefore indicates an inefficient product as it draws more.
Lytswitch6 led drivers from power integrations feature. This driver has an internal regulator that allows it to operate from 8vdc to 550vdc. This paper presents a dimmable light emitting diode led driver with adaptive feedback control for lowpower lighting applications. Power factor pf is the relationship between real and apparent power, and represents the ratio between the actual load kw and the apparent load kva.
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