Tunable White LED Drivers

Game da Wannan Takarda

Wannan bayanin aikace-aikacen yana ba injiniyoyin ƙirar LED da injiniyoyin aikace-aikacen filin cikakkiyar jagora game da aiwatar da ingantaccen tsada, ingantattun masu tuƙi na LED ta amfani da Infineon's BCR601 da BCR602 na'urori na yau da kullun na layi.

The document demonstrates how to replace the traditional buck converter second stage with a linear regulator featuring active headroom control (AHC) without sacrificing efficiency. This approach achieves the highest possible light quality with a very cost-effective solution, particularly beneficial for tunable white and multichannel drivers.

Linear Constant Current Regulators in LED Drivers

As light quality requirements increase, LED driver topologies that provide almost perfect DC current at the output are gaining popularity. The BCR601 and BCR602 linear regulators with active headroom control can achieve efficiencies on par with buck stages while delivering superior light quality.

Tsarin AHC ya ƙunshi madaukai biyu na ƙa'ida:

• Madauki na farko yana daidaita halin yanzu na LED zuwa ƙimar da aka ƙaddara ta hanyar resistor hankali da tunani na ciki
• Na biyu madauki yana rage ƙarfin ƙafar sama kusa da mafi ƙanƙanta ta yiwuwa ta hanyar sarrafa fitarwar ƙarfin mataki na farko

Manyan fa'idodin wannan hanya sun haɗa da:

• Tsantsar DC LED na yanzu yana kawar da flicker da tasirin stroboscopic
• Bin ka'idojin IEEE 1789-2015 a ƙarƙashin kowane yanayi na aiki
• Analog dimming har zuwa 3% ba tare da irin PWM modulation ba
• Yawan ƙira zai haifar da inganci sama da kashi 95 cikin ɗari.

Saitin Halin LED da Dusar ƙanƙara

Mai sarrafawa yana da ma'anar ƙarancin haske wanda ba a dushe shi ba na 400mV. Ana iya rage yawan halin LED ta hanyar fil ɗin dusar ƙanƙara (MFIO) ko dai ta hanyar amfani da wutar lantarki DC ko ta amfani da mai canza juriya.

Optimization na Ingantaccen Aiki

Jimlar asarar wutar lantarki na mai sarrafa kwararar LED tare da AHC ya ƙunshi asara a cikin ma'aunin ma'ana da MOSFET. Ana iya inganta ingancin ta hanyar:

• Yin amfani da mafi girman ƙarfin lantarki na LED don ƙayyadaddun ƙarfin fitarwa
• Rage ƙarancin ƙarar fitar da wutar lantarki na mataki na farko
• Zaɓin da ya dace na ƙarfin fitarwa
• Mafi kyawun saitin ƙarfin kai

Siffofin Kariya

BCR601/602 sun haɗa da cikakkiyar kariya:

• Kariyar Lallashi Wutar Lantarki Tsarin OVP na ciki tare da kofa mai iya kayyadawa
• Kariyar Yanayin Zafi Na'injin ciki yana rage yanayin LED a zazzabin haɗin gwiwa 140°C
• Kariyar Haɗawa Zazzabi: Yana iyakance ƙarar ruwa lokacin haɗa layukan LED zuwa direbobi masu aiki
• Kariyar Gajeren Kewayawa: Optional external circuit for output short protection

Multichannel LED Driver with BCR601 plus BCR602

The linear regulator approach can be easily extended to multiple output channels by adding BCR602 stages. BCR602 is similar to BCR601 but without AHC, making it ideal for additional channels in a smaller SOT-23-6 package.

A cikin tsarin tashoshi masu yawa, mafi kyawun dabarun ita ce koyin amfani da tashar da ke da mafi ƙarancin ƙarfin kai don daidaitawa. Wannan yana tabbatar da cewa duk tashoshi suna karɓar isasshen ƙarfin lantarki yayin kiyaye inganci.

Cibiyar sadarwa don daidaita mafi ƙasan V_HR Ya ƙunshi mai juriya guda ɗaya da ƙaramin diodi na siginar kowane tashoshi. Wannan hanya tana tabbatar da aikin da ya dace a cikin bambancin halayen LED a cikin aikace-aikacen farin tunable.

Muhimman abubuwan da ake la'akari da su don ƙirar multichannel:

• Halin dimming yayi kama da juna a cikin tashoshi
• BCR601 ke kula da OVP ga dukan aikace-aikacen
• Kariya daga gajeren kewayawa na buƙatar kulawa da watsawar wutar lantarki na Zener diode
• A ba yi saka LED a cikin aikace-aikacen tashoshi da yawa ba a goyan baya ba.

Tsarin Tunable White Reference

Tsarin tunani na tunani yana nuna cikakkiyar aiwatar da direban LED na farin fata ta amfani da BCR601 da BCR602. Hukumar za a iya haɗa shi da ra'ayin hukumar modular na Infineon (REF-XDPL8219-U40W) ko kowane mataki na farko na SSR PFC.

Board Specifications

Bayanin Da'ira

Zanen zanen tunani ya haɗa da:

• Resistors saitin na yanzu ga kowane tashoshi
• Circuits de protection contre les courts-circuits de sortie
• Réseau de réglage de la tension de tête
• Condensateurs de découplage pour réduction du bruit
• OVP voltage divider
• Stable supply for optocoupler circuit
• 3.3V regulator domin controller supply

Aikin Wutar Lantarki

BCR601-based regulator ya nuna halayen aiki masu kyau:

LED Current Stability

Tsarin tunani yana kiyaye LED na yanzu a tsaye a cikin bambancin adadin LEDs masu haɗi, tare da ƙaramin karkata daga manufa na yanzu.

Gudanarwa Inganci

Auna inganci yana nuna aiki sama da kashi 94% tare da kyakkyawan ƙira, yana gasa yadda ya kamata tare da hanyoyin gudanarwa masu sauyawa yayin samar da ingantaccen haske.

Nazarin Ingancin Hasken

Hanyar sarrafa layin layi tana ba da ingancin haske na musamman ba tare da kusan gyare-gyare ba:

• Ƙididdigar gyare-gyare ƙasa da 0.1% a matsakaicin halin yanzu na LED
• AC content ya kasance a koyaushe yayin da fitowar haske ke canzawa
• Ƙaramin flicker da tasirin stroboscopic a cikin kewayon dimming
• Bin ƙa'idodin ingancin haske masu tsauri

Ma'aunai tare da ma'aunin haske na bakan sun nuna kyakkyawan aiki:

Tsarin Aiki

Lokacin da aka haɗa shi tare da REF-XDPL8219-U40W na gefen farko, cikakken tsarin yana nuna:

• Cikakwen kayan aiki na tsarin sama da 87% a cikin wutar lantarki na shigarwa
• Excellent power factor (>0.99) over wide dimming range
• Low input current THD (<10%)
• Stable thermal performance under full load conditions

These results are impressive for a high-power flyback with linear second stage and compete effectively with more complex topologies.

Bill of Materials

Zancen zane ya haɗa da cikakken lissafin kayan aiki tare da abubuwan haɗin gwiwa daga shahararrun masana'antu: