NCL2801LED2GEVB Deep Dimming LED Driver 150 W Evaluation Board User's Manual www.onsemi.com EVAL BOARD USER’S MANUAL OVERVIEW This manual covers the specification, theory of operation, testing and construction of the NCL2801LED2GEVB demo board. This demo board uses NCL2801 as the front end PFC and NCP13992 LLC for the output converter which demonstrates a 150W LED driver. This LED driver features deep dimming with a 0−10 V interface. Figure 1.
NCL2801LED2GEVB SPECIFICATIONS Input voltage 90 Vac – 305 Vac Output Voltage 50 Vdc Nom. Output Current 1.5 A Max Output Ripple ± 5% Max 94% Max Efficiency Switching Frequency Dimming Interface Dimming Range PCB Size 85 kHz − 140 kHz 0 – 10 V 0.3% − 100% 180 mm × 65 mm delay lowers the switching frequency and can improve efficiency under certain load conditions.
NCL2801LED2GEVB rise to 107% of nominal, a second OVP function stops all switching to avoid a run−away situation. Switching resumes when the output voltage returns to normal. The OVP functions can be observed during initial startup and for large reductions in output load. The CS pin links the switch current to the boost control function. This pin also provides over current protection on a cycle by cycle basis. A programming feature is also managed by the CS pin.
NCL2801LED2GEVB Dimming main loop is in control, Q3 is saturated for maximum efficiency. Once Q3 enters the active mode and controls the LED current, Q7 regulates the voltage across Q3 to optimize power losses while allowing Q3 to be in the linear region and provide a very stable output current even though the LLC is in skip mode. In order to avoid flicker issues caused by skip mode operation, this deep dimming design uses 2 current control loops.
NCL2801LED2GEVB SCHEMATIC F1 L2 3A15 Slo 390 mH AC_L J1 1 2 3 R1 C2 220 nF 320 V CON3 L1 C1 220 nF 10mH AC_N D1 + C3 HVDC_Rect AC1 330 nF AC2 L3 − GBU6J 390 mH C4 D2 Mult_out 4.7 nF Y1 ES1JFL D3 ES1JFL Figure 3. Input Curcuit D5 TX1 RURD660S9A D6 Vboost o HVDC_Rect RURD660S9A o Vboost C13 150 nF Mult_out R14 C14 1.5 Meg R15 100 mF 500 V 1.5 Meg R16 1.
NCL2801LED2GEVB Vboost R70 LCC_Vcc Mult_out 2.7k R2 R71 R281 R69 2.
NCL2801LED2GEVB U5 S−1212BA0−M5T1U 1 3 VIN VOUT nc GND On/Off C24 2 R74 Dim_Vcc_reg 5 10 mF 4 Sec_Vcc 56k R59 R77 R75 10Meg DNI 7.15k 10k R60 100 U11 SI8735BC−ISR 8 Sec_Vcc_reg Idim 7 6 5 Vdd nc Vout Anode nc 6 4 2 1 + 3 − 7.15k 3 Cath Gnd U6 R58 1 TLV1805−Q1 4 nc 2 5 R46 R47 R48 56k 56k 56k C31 C37 1 mF Freq − 6k C29 C30 1 nF 1 nF 1 nF C32 22 mF Figure 7. Dim Interface Circuit Secondary Vcc Sec_7V0_bulk R65 1.
NCL2801LED2GEVB BILL OF MATERIAL Mfr_PN Insert Safety Controlled Wurth 890334024002 Yes Yes Wurth 890334024003CS Yes Yes 490−9395−ND Murata DE1E3KX472MB4BP01F Yes Yes 1276−1001−1−ND Samsung CL05B104KO5NNNC Yes No 311−1504−1−ND Yageo CC1206JKNPOCBN221 Yes No Digikey 495−7325−ND Epcos B32683A0223K000 Yes No Digikey 732−7547−1−ND Wurth 885012205052 Yes No 470uF 63V Digikey 493−1647−ND Nichicon UHE1J471MHD6 Yes No C12 10nF Digikey 1276−1028−1−ND Samsung 1276−102
NCL2801LED2GEVB BILL OF MATERIAL (continued) Quantity Reference Part Distributor Dist.
NCL2801LED2GEVB BILL OF MATERIAL (continued) Quantity Reference Part Distributor Dist.
NCL2801LED2GEVB TEST DATA Figure 9. Efficiency Figure 10. Regulation Figure 11. Power Factor Figure 12. THDi Figure 13. Dim Curve Figure 14. Standby Power www.onsemi.com 11 Downloaded from Arrow.com.
NCL2801LED2GEVB Figure 15. Output @ Min Load Figure 16. Output @ 150 mA www.onsemi.com 12 Downloaded from Arrow.com.
NCL2801LED2GEVB Figure 17. Output @ 600 mA Figure 18. Output @ Max Load www.onsemi.com 13 Downloaded from Arrow.com.
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