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I-90W Constant Voltage PWM Output LED Driver

Uchungechunge lwe-PWM-90


Imanuwali yomsebenzisi
KUSHO KAHLE PWM-90 Series Constant Voltageya QR1

 KUSHO KAHLE PWM-90 Series Constant Voltageya A0

SHO KAHLE DALI 1                    SHO KAHLE DALI 2
(okwe-DA2-Type kuphela) (Ngohlobo lwe-DA kuphela)

I-Icon Certi 1 isho KAHLE        I-Icon Certi 2 isho KAHLE
Okokufaka kwe-AC: 100-240Vac
(ye-DA2-Type kuphela)

I-Icon Certi 3 isho KAHLE
(CCC ngokuzikhethela)

I-Icon Certi 4 isho KAHLE
(kwa-12, 24, 48, Uhlobo Olungenalutho kuphela)

I-Icon Certi 5 isho KAHLE           I-Icon Certi 6 isho KAHLE
(ye-DA2 kanye Nohlobo Olungenalutho)

■ Izici
  • IConstant Voltage PWM isitayela okukhiphayo
  • Isicelo sokukhanyisa izimo eziphuthumayo siyatholakala ngokuya nge-IEC61347-2-13
  • Umsebenzi owakhelwe ngaphakathi we-PFC nomklamo wesigaba II
  • Iyunithi yamandla ekilasi 2(ngaphandle kwe-PWM-90-12)
  • Akukho ukusetshenziswa kwamandla okulayisha <0.5W
  • Ihlanganiswe ngokugcwele nezinga le-IP67
  • Umsebenzi: 3 ku-1 dimming (dim-to-off); I-DALI/DALI-2
  • Ileveli encane yokufiphala engu-0.2% yohlobo lwe-DALI
  • Isikhathi sokuphila esijwayelekile> amahora angu-50000 kanye newaranti yeminyaka emi-5
■ Izinhlelo zokusebenza
  • Ukukhanyisa kwe-strip ye-LED
  • Ukukhanyisa kwe-LED kwangaphakathi
  • Ukukhanyisa kwe-LED kokuhlobisa
  • Ukukhanyisa kwezakhiwo ze-LED
  • Izibani zezimboni
■ IKHODI YE-GTIN

Ukusesha kwe-MW: https://www.meanwell.com/serviceGTIN.aspx

■ Incazelo

Uchungechunge lwe-PWM-90 ingumshayeli we-LED AC/DC we-LED ongu-90W ohlanganisa ivolumu engaguquki.tagImodi ye-e ephumayo yesitayela se-PWM, ekwazi ukugcina ukugqama kwe-homogeneity lapho ushayela zonke izinhlobo zemigqa ye-LED.I-PWM-90 isebenza kusukela ku-90~305VAC futhi inikeza amamodeli anevolthi elinganiselwe ehlukenetagesukela phakathi kuka-12V kanye no-48V. Ngenxa yokusebenza kahle okuphezulu okungafika ku-90.5%, ngomklamo ongena fan, lonke uchungechunge luyakwazi ukusebenza ku--40°C ~ +85°C izinga lokushisa lekesi ngaphansi kwe-convection yomoya yamahhala. Lonke uchungechunge lulinganiselwe ngezinga lokuvikela lokungena le-IP67 futhi lifanele ukusebenzela okomile, damp noma izindawo ezimanzi. I-PWM-90 ifakwe umsebenzi wokufiphalisa oshintshayo umjikelezo wemisebenzi wokukhiphayo, ohlinzeka ngokuguquguquka okukhulu kwezinhlelo zokusebenza zemigqa ye-LED.

■ Umbhalo wekhodi oyimodeli

KUSHO KAHLE PWM-90 Series Constant Voltageya A1

  1. Izinketho zomsebenzi
  2. Kukalwe isilinganiso voltage (12/24/36/48V)
  3. Kukalwe wattage
  4. Igama lochungechunge
Uhlobo Izinga le-IP Umsebenzi Qaphela
Akunalutho IP67 3 kokungu-1 kokufiphala komsebenzi (0~10Vdc, isignali ye-PWM engu-10V nokumelana) Kukhona kusitoki
DA IP67 Ubuchwepheshe bokulawula be-DALI(ye-12V/24V enohlobo lwe-DA kuphela) Kukhona kusitoki
I-DA2 IP67 Ubuchwepheshe bokulawula be-DALI-2(ye-12V/24V/48V enohlobo lwe-DA2 kuphela) Kukhona kusitoki
INKCAZO
INDLELA I-PWM-90-12 Isithonjana sebhokisi 1 I-PWM-90-24 Isithonjana sebhokisi 1 I-PWM-90-36 Isithonjana sebhokisi 1 I-PWM-90-48 Isithonjana sebhokisi 1
OKUPHUMAYO DC VOLTAGE 12V 24V 36V 48V
ILINGANISWE NJENGAMANJE 7.5A 3.75A 2.5A 1.88A
AMANDLA AKALIWE 90W 90W 90W 90.24W
IBANGA LOKUPHIMA 0 ~ 100%
IZIMPENDULO ZE-PWM (Uhlobo.) 1.47kHz Yokungenalutho/DA-Type, 2.5kHz ku-DA2-Type
UKUSETHA, UKUPHUMULA ISIKHATHI Qaphela.2 Qaphela.9 500ms, 80ms/115VAC noma 230VAC 
ISIKHATHI SOKUMUSA (Uhlobo.) 16ms / 115VAC noma 230VAC
INPUT I-VOLTAGE RANGE Note.3 90 ~ 305VAC 127 ~ 431VDC
(Sicela ubhekisele esigabeni esithi “STATIC CHARACTERISTIC”)
IFREQUENCY RANGE I-47 ~ 63Hz
AMANDLA FUTHI (Uhlobo.) I-PF> 0.98 / 115VAC, PF> 0.96 / 230VAC, PF> 0.92 / 277VAC @ umthwalo ogcwele
(Sicela ubhekisele esigabeni esithi “POWER FACTOR (PF) CHARACTERISTIC”)
UKUHLUZEKA KWE-HARMONIC TOTAL I-THD< 20%(@load≧60%/115VAC, 230VAC; @load≧75%/277VAC)
(Sicela ubheke esigabeni esithi “TOTAL HARMONIC DISTORTION”) 
UKUSEBENZA (Uhlobo.) 88% 90.5% 90.5% 90.5%
I-AC CURRENT (Uhlobo.) 0.95A / 115VAC 0.5A / 230VAC 0.4A / 277VAC
INRUSH CURRENT (Uhlobo.) I-COLD START 60A(twidth=550 μs ilinganiswa ku-50% Ipeak) ku-230VAC; Ngokwe-NEMA 410
MAX. CHA. yama-PSU ku-16A CIRCUIT BREAKER amayunithi ayi-3 (i-circuit breaker yohlobo B) / amayunithi angama-6 (i-circuit breaker yohlobo C) ku-230VAC
UKUVUZA NJENGAMANJE <0.25mA / 277VAC
AKUKHO UKUSETSHENZISWA KWAMANDLA OMTHETHO <0.5W
UKUVIKELA LAYISHA 108 ~ 130% amandla okukhiphayo alinganiselwe
Imodi ye-Hiccup, ilulama ngokuzenzakalelayo ngemva kokususwa kwesimo sephutha
WESIFUNDA ESIFISHANE Vala i-o/p voltage, vula amandla kabusha ukuze ululame(ngaphandle kohlobo lwe-DA2) Imodi ye-Hiccup, ilulama ngokuzenzakalelayo ngemva kokususwa kwesimo sephutha (ngohlobo lwe-DA2 kuphela)
NGAPHEZU KWE-VOLTAGE 15 ~ 17V  28 ~ 34V 41 ~ 46V 54 ~ 60V
Vala i-o/p voltage, vula amandla kabusha ukuze ululame
NGENXA KWETEMPERATURE Vala i-o/p voltage, vula amandla kabusha ukuze ululame
EZIMO I-TEMP YOKUSEBENZA. Tcase=-40 ~ +85℃ (Sicela ubhekisele esigabeni esithi “ OUTPUT LOAD vs TEMPERATURE”)
MAX. CASE TEMP. Isikhwama = + 85 ℃ 
UKUSEBENZA UKUTHOBEKA Ama-20 ~ 95% RH angavumeli
STORAGE TEMP., HUMIDITY -40 ~ + 80 ℃, 10 ~ 95% RH
ISIKHATHI. OKUQINISEKILE ± 0.03% / ℃ (0 ~ 50 ℃)
UKUDLIZELA 10 ~ 500Hz, 5G 12min./1cycle, isikhathi se-72min. ngayinye ihambisana nezimbazo ezingu-X, Y, Z
UKUPHEPHA NE-EMC AMAZINGA OKUPHEPHA Qaphela.5 UL8750(ngaphandle kwe-DA-Type), i-CSA C22.2 No. 250.13-12; I-ENEC BS EN/EN61347-1, BS EN/EN61347-2-13 ezimele, BS EN/EN62384, IP67,BIS IS15885(for 12,24,48 Blank Type kuphela), EAC TP TC 004,GB19510.1, GB19510.14. 60335 abagunyaziwe; Idizayini ibhekisela ku-BS EN/EN1-61347;Ngokuvumelana ne-BS EN/EN2-13-100 isithasiselo J esilungele ukufakwa kwezimo eziphuthumayo(EL)(AC Input: 240-2Vac)(ku-DAXNUMX-Type kuphela)
AMAZINGA E-DALI I-IEC62386-101, 102, 207,251 ye-DA/DA2-Type kuphela,Uhlobo lwedivayisi 6(DT6)
INGABE I-VOLTAGE I/PO/P:3.75KVAC; I/P-DA:1.5KVAC; I-O/P-DA:1.5KVAC
UKUMELANA UKUZIHLUPHA I/PO/P:100M Ohms / 500VDC / 25℃/ 70% RH
I-EMC EMISSION Note.6 Ukuthobela i-BS EN / EN55015, i-BS EN / EN61000-3-2 Class C (@ umthwalo ≧ 60%); I-BS EN / EN61000-3-3, i-GB17743 ne-GB17625.1, i-EAC TP TC 020
UKUVIKELWA EMC Ukuhambisana ne-BS EN/EN61000-4-2,3,4,5,6,8,11; I-BS EN/EN61547, izinga lemboni yokukhanya (surge immunity Line-Line 2KV), EAC TP TC 020
ABANYE MTBF 2394.5K amahora iminithi. I-Telcordia SR-332 (Bellcore); Amahora angu-224.2K min. I-MIL-HDBK-217F (25℃)
DIMENSION 171*63*37.5mm (L*W*H)
UKUPAKA 0.77Kg; 18pcs / 14.9Kg / 0.97CUFT
QAPHELA 1. Wonke amapharamitha OKUNGEKHO okushiwo ngokukhethekile akalwa kokufaka okungu-230VAC, kukalwe okwamanje kanye no-25°C wezinga lokushisa elizungezile.
2. Ukwehliswa kwesilinganiso kungase kudingeke ngaphansi kwevolumu ephansi yokufakatages. Sicela ubheke izigaba "STATIC CHARACTERISTIC" ukuze uthole imininingwane.
3. Ubude besikhathi sokusetha bulinganiswa ekuqaleni okubandayo. UKUVULA/UKUVALA umshayeli kungaholela ekwandeni kwesikhathi sokusetha.
4. Umshayeli uthathwa njengengxenye ezosetshenziswa ngokuhambisana nemishini yokugcina. Njengoba ukusebenza kwe-EMC kuzothintwa ukufakwa okuphelele, abakhiqizi bemishini yokugcina kufanele baphinde bafanelekele i-EMC Directive ekufakweni okuphelele futhi.
5. Lolu chungechunge luhlangabezana neminyaka yokuphila evamile > yamahora angu-50,000 okusebenza lapho iphoyinti le-Tcase, ikakhulukazi (i-TC) (noma i-TMP, nge-DLC ngayinye), icishe ibe ngu-75°C noma ngaphansi.
6. Sicela ubheke isitatimende sewaranti ku-MEAN WELL's webindawo ku http://www.meanwell.com
7. Izinga lokushisa le-ambient liyancipha libe ngu-3.5°C/1000m elinamamodeli angena fan futhi elingu-5°C/1000m elinamamodeli amafeni okuphakama kokusebenza okuphezulu kuno-2000m(6500ft).
8. Nganoma iyiphi inothi lesicelo kanye nesexwayiso sokufakwa kwe-IP umsebenzi wokufaka ubufakazi bamanzi, sicela ubheke imanuwali yethu yomsebenzisi ngaphambi kokuyisebenzisa. https://www.meanwell.com/Upload/PDF/LED_EN.pdf
9. Ngokusekelwe kumandla we-IEC 62386-101/102 DALI kumithetho yesikhathi nokuphazamiseka, isikhathi sokusetha sidinga ukuhlolwa ngesilawuli se-DALI esingasekela amandla e-DALI emsebenzini, ngaphandle kwalokho isikhathi sokusetha sizoba ngaphezu kwesekhondi elingu-0.5 Uhlobo lwe-DA.
※ Umshwana Wokuzihlangula Womkhiqizo : Ukuze uthole imininingwane eyengeziwe, sicela ubheke https://www.meanwell.com/serviceDisclaimer.aspx
■ UKUSEBENZA KWE-DIMMING

KUSHO KAHLE PWM-90 Series Constant Voltageya A2

  1. I-AC/L(Ensundu)
  2. AC/N(Blue)
  3. I-DIM+(Okuphephuli)*
  4. I-DIM-(Pinki)**
  5. I-Vo+(Bomvu)
  6. I-Vo-(Mnyama)

* I-DIM+ yohlobo Olungenalutho
I-DA+ yohlobo lwe-DA/DA2
* *DIM- Yohlobo Olungenalutho
I-DA- ye-DA/DA2-uhlobo
File Igama: PWM-90-SPEC 2022-11-28
QAPHELA: I-DA/DA2-Type ayiwona mahluko phakathi kwezigxobo zika-“+” nezithi “-”

Isimiso sokufiphalaza sokukhishwa kwesitayela se-PWM
• Ukufiphaza kufinyelelwa ngokushintsha umjikelezo wemfanelo wokukhipha amandla.

I-Output DC yamanje

KUSHO KAHLE PWM-90 Series Constant Voltageya A3

Umjikelezo womsebenzi(%) = T ON/T ×100%

Imvamisa yokuphuma kwe-PWM : 1.47kHz Yohlobo Olungenalutho/DA-Type, 2.5kHz ye-DA2-Type

※ 3 koku-1 kokufiphalisa umsebenzi (kohlobo Olungenalutho)

  • Sebenzisa enye yezindlela ezintathu phakathi kwe-DIM+ ne-DIM-: 0 ~ 10VDC, noma isignali ye-PWM engu-10V noma ukumelana.
  • Umthombo ofiphalayo wamanje kusuka kumandla kagesi: 100μA (uhlobo.)

◎ Ukusebenzisa isithasiselo 0 ~ 10VDC

KUSHO KAHLE PWM-90 Series Constant Voltageya A4

  1. Imibala ye-LED
  2. I-Additive Voltage
  3. "UNGAxhumeki "DIM- ku-Vo-"
  4. Umjikelezo womsebenzi wokuphumayo wamanje (%)
  5. Okokufaka kokufiphaza: Ivolumu yokwengezatage

◎ Ukusebenzisa isiginali ye-10V PWM engeziwe (ububanzi befrikhwensi 100Hz ~ 3KHz):

KUSHO KAHLE PWM-90 Series Constant Voltageya A5

  1. Imibala ye-LED
  2. Isiginali ye-PWM eyengeziwe
  3. "UNGAxhumeki "DIM- ku-Vo-"
  4. Umjikelezo womsebenzi wokuphumayo wamanje (%)
  5. Umjikelezo womsebenzi wokungeza okufakiwe kwesignali ye-10V PWM yokufiphalisa

◎ Ukusebenzisa ukumelana nesengezo:

KUSHO KAHLE PWM-90 Series Constant Voltageya A6

  1. Imibala ye-LED
  2. Ukumelana Okungeziwe
  3. "UNGAxhumeki "DIM- ku-Vo-"
  4. Umjikelezo womsebenzi wokuphumayo wamanje (%)
  5. (N=ubuningi bomshayeli bokusebenza kokufiphalisa okuvumelanisiwe) Okokufaka kokufiphalisa: Ukumelana okungeziwe

Qaphela :

  1. Okuncane. umjikelezo womsebenzi wokukhiphayo wamanje cishe u-0.15%, futhi okokufaka kokufiphalisa cishe ku-6KΩ noma 0.6VDC, noma isignali engu-10V PWM enomjikelezo womsebenzi ongu-6%.
  2. Umjikelezo womsebenzi wokukhiphayo wamanje ungase wehle ufike ku-0% lapho okokufaka kokufiphalisa kungaphansi kuka-6KΩ noma ngaphansi kuka-0.6VDC, noma isignali engu-10V PWM enomjikelezo wemisebenzi ongaphansi kuka-6%.

※ DALI Interface (uhlangothi oluyinhloko; lwe-DA/DA2-Type)

  • Faka isignali ye-DALI phakathi kwe-DA+ ne-DA-.
  • Iphrothokholi ye-DALI inamaqembu ayi-16 namakheli angama-64.
  • Isinyathelo sokuqala simi ku-0.2% womkhiqizo
■ OUTPUT LOAD vs TEMPERATURE

Umthwalo (%)    KUSHO KAHLE PWM-90 Series Constant Voltageya B1
I-AMBIENT TEMPERATURE,Ta (℃)

Umthwalo (%)KUSHO KAHLE PWM-90 Series Constant Voltageya B2
Tcase (℃)

■ ICHARACTERISTIC EZINGABHALI

Umthwalo (%)KUSHO KAHLE PWM-90 Series Constant Voltageya B3
FAKA IVOLITAGE (V) 60Hz

■ ISIQINISEKISO SAMANDLA (PF) ISIQINISEKISO

※ Tcase ku-75℃

PFKUSHO KAHLE PWM-90 Series Constant Voltageya B4
layisha

※ Ukulinganisa kuyadingeka ngaphansi kwevolumu ephansi yokufakatage.

■ I-TOTAL HARMONIC DISTORTION (THD)

Model Imodeli engu-48V, i-Tcase ku-75 ℃

I-THDKUSHO KAHLE PWM-90 Series Constant Voltageya B5
layisha

■ UKUSEBENZA vs UMLAYO

Uchungechunge lwe-PWM-90 lunokusebenza okuseqophelweni eliphezulu okungafinyelelwa ku-90.5% ezinhlelweni zokusebenza zasenkambu.

Model Imodeli engu-48V, i-Tcase ku-75 ℃

UKUSEBENZA(%)KUSHO KAHLE PWM-90 Series Constant Voltageya B6
layisha

■ ISIKHATHI SOKUPHILA

UKUPHILA(Kh)KUSHO KAHLE PWM-90 Series Constant Voltageya B7
I-Tcase (℃)

■ Block Diagram

I-PFC fosc: 50~120KHz
I-PWM fosc: 60~130KHz

KUSHO KAHLE PWM-90 Series Constant Voltageya B8

  1. IZIHLUNGI ZAMA-EMI
  2. I-PFC CIRCUIT
  3. UKUGUQULWA KWAMANDLA
  4. IZILUNGISELELO NEZIHLUNGI
  5. I-DIMMING CIRCUIT
  6. I-OLP
  7. UMZUZWANA WOKUTHOLA
  8. I-OVP
  9. PWM & PFC ULAWULO
  10. I-OTP
■ Ukucaciswa kweMechanical

Inombolo yekesi ye-PWM-90P: mm

Uhlobo Olungenalutho

KUSHO KAHLE PWM-90 Series Constant Voltageya B9
• (tc): Ubukhulu. I-Case Temperature

  1. I-AC/L(Ensundu)
  2. AC/N(Blue)
  3. I-SJTW 18AWG×2C
  4. I-UL2464 18AWG×2C
  5. I-SJTW 16AWG×2C
  6. I-DIM+(Okuphephuli)*
  7. I-DIM-(Pinki)**
  8. I-Vo+(Bomvu)
  9. I-Vo-(Mnyama)

KUSHO KAHLE PWM-90 Series Constant Voltageya B10

I-DA/DA2-Type

KUSHO KAHLE PWM-90 Series Constant Voltageya B11
• (tc): Ubukhulu. I-Case Temperature

  1. I-AC/L(Ensundu)
  2. AC/N(Blue)
  3. SJOW 17AWG×2C&H05RN-F1.0mm2
  4. I-UL2464 18AWG×2C
  5. SJOW 17AWG×2C&H05RN-F1.0mm2
  6. I-DA+(Okuphephuli)*
  7. DA-(Pink)**
  8. I-Vo+(Bomvu)
  9. I-Vo-(Mnyama)

QAPHELA: Uhlobo lwe-DA/DA2 alunawo umehluko phakathi kwezigxobo zika-“+” nezithi “-”

KUSHO KAHLE PWM-90 Series Constant Voltageya B12

■ Ncoma i-Mounting Direction

KUSHO KAHLE PWM-90 Series Constant Voltageya B13

■ Imanuwali yokufaka

Ukuxhumana kohlobo olungenalutho

KUSHO KAHLE PWM-90 Series Constant Voltageya B14

  1. I-AC/L(BROWN)
  2. I-AC/N(LULUHLAZA)
  3. I-DIM-(PINK)
  4. I-DIM+(PURPLE)
  5. -V(EMNYAMA)
  6. +V(RED)
  7. 0~10Vdc noma 10V PWM
    noma ukumelana ne-Dimmer
    noma i-DALI Dimmer
  8. Umugqa we-LED

Izixwayiso

  • Ngaphambi kokuqala noma yimuphi umsebenzi wokufaka noma wokulungisa, sicela unqamule ukunikezwa kwamandla kosizo. Qinisekisa ukuthi ayikwazi ukuxhunywa kabusha ungaqondile!
  • Gcina umoya ohlanzekile uzungeze iyunithi futhi ungapakishi noma iyiphi into kuyo. Futhi indawo yokushisa engu-10-15 cm kufanele igcinwe lapho idivayisi eseduze ingumthombo wokushisa.
  • Ukukhweza umumo ngaphandle kokuma okujwayelekile noma ukusebenza ngaphansi kwezinga lokushisa le-ambient eliphezulu kungase kwenyuse izinga lokushisa lengxenye yangaphakathi futhi kuzodinga ukwehliswa kokulinganisa kokuphumayo kwamandla.
  • Isilinganiso samanje sekhebula eyinhloko/yesibili egunyaziwe kufanele sibe sikhulu noma silingane neseyunithi. Sicela ubhekisele ekucacisweni kwayo.
  • Kubashayeli be-LED abanezixhumi ezingangeni manzi, qinisekisa ukuthi ukuxhumana phakathi kweyunithi nendawo yokukhanyisa kuqinile ukuze amanzi angakwazi ukungena kusistimu.
  • Kumashayeli e-LED acimazekayo, qiniseka ukuthi isilawuli sakho sokufiphalisa siyakwazi ukushayela lawa mayunithi. Uchungechunge lwe-PWM ludinga u-0.15mA iyunithi ngayinye.
  • Tc ubuningi. ikhonjwa kulebula yomkhiqizo. Sicela uqiniseke ukuthi izinga lokushisa le-Tc point ngeke lidlule umkhawulo.
  • UNGAXHUMI “DIM- to Vo-“.
  • Ifanele ukusetshenziswa kwangaphakathi noma ukusetshenziswa ngaphandle ngaphandle kokuchayeka elangeni okuqondile. Sicela ugweme ukucwiliswa emanzini ngaphezu kwemizuzu engama-30.
  • Ukunikezwa kwamandla kubhekwa njengengxenye ezosetshenziswa ngokuhambisana nemishini yokugcina. Njengoba ukusebenza kwe-EMC kuzothintwa ukufakwa okuphelele, abakhiqizi bemishini yokugcina kufanele baphinde bafanelekele i-EMC Directive ekufakweni okuphelele futhi.

File Igama: PWM-90-SPEC 2022-11-28

Kulandwe kusuka Umcibisholo.com.

Amadokhumenti / Izinsiza

ISHO KAHLE PWM-90 Series 90W Constant Voltage PWM Output LED Driver [pdf] Incwadi Yomnikazi
I-PWM-90 Series 90W Constant Voltage PWM Output LED Driver, PWM-90 Series, 90W Constant Voltage PWM Output LED Driver, Voltage PWM Output LED Driver, PWM Output LED Driver, Output LED Driver, LED Driver
ISHO KAHLE PWM-90 Series 90W Constant Voltage PWM Output LED Driver [pdf] Incwadi Yomnikazi
I-PWM-90 Series 90W Constant Voltage PWM Output LED Driver, PWM-90 Series, 90W Constant Voltage PWM Output LED Driver, Constant Voltage PWM Output LED Driver, Voltage PWM Output LED Driver, PWM Output LED Driver, Output LED Driver, LED Driver, Driver

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