NCP3065D2SLDGEVB

DN06031/D Design Note – DN06031/D High Brightness LED SEPIC Driver Device Application Input Voltage Output Power Topology I/O Isolation NCP3065 NCV3065 Solid State, Automotive and Marine Lighting 8-25 V = = 1.7 μF f ⋅ r ⋅ VOUT min 250 ⋅ 10 3 ⋅ 0.1 ⋅ 7.3 The value could be much larger for higher stability, but a higher value impacts the dimming function at low duty cycle. The resistor R8 is used to stabilize feedback loop. Used value is compromise for whole input and output voltage range. If this circuit is used for specified load only, it should be tuned by this resistor to better efficiency and line regulation. X1-3 input is used for dimming. The dimming signal level is 2-10 V. The recommended dimming frequency is about 200 Hz. For frequencies below 100 Hz the human eye will see the flicker. The dimming function utilizes the NCP3065’s peak current protection input. The second way to achieve this is to use the FB pin. See figure 10. Conclusion This circuit is ideal in applications with strings of two to six LED chips powered from a power supply with wide input range (8-20V). The advantages of this circuit include its small size, low price, wide input and output voltage ranges, and very small input current ripple. November 2007, Rev.2 www.onsemi.com 4 DN06031/D PC Board Figure 3 – components position on PCB Figure 4 – PCB’s top side November 2007, Rev.2 www.onsemi.com 5 DN06031/D Figure 5 – PCB’s bottom side November 2007, Rev.2 www.onsemi.com 6 R3 R9 R7 C6 C3 R2, R4, R5 C2 R8 C1 C4, C5 C7 R6 X2 X1 D2 Q1 D1 Q2 D3 IC1 Q3 R1 R10, R11 TP1, TP2, TP3, TP4, TP5, TP6 TR1 TR1 Designator 1 1 1 1 1 3 1 1 1 2 1 1 1 1 1 1 1 1 1 1 1 1 2 6 1 1 Resistor SMD Resistor SMD Resistor SMD Ceramic Capacitor SMD Ceramic Capacitor SMD Resistor SMD Ceramic Capacitor SMD Resistor SMD Ceramic Capacitor SMD Capacitor Ceramic Capacitor SMD Resistor SMD Inlet Terminal Block Outlet Terminal Block Schottky Diode 30V General Purpose Transistor NPN Surface Mount Schottky Power Rectifier PNP General Purpose Transistor Zener Diode 500 mW 24 V Constant Current Switching Regulator Power MOSFET 24 Amps, 60 Volts, Logic Level, N-Channel Resistor SMD Resistor SMD Test Point Transformer for 0.35A version Transformer for 0.7A version Quantity Description 1M5 1k 1k5 2n7 6n8 10k 10uF/25V 27k 100nF 120uF/50V 330pF 390R DG350-3.50-02 DG350-3.50-03 BAT54HT1G BC817-40LT1G MBRS260T3G MMBT3906LT1G MMSZ24T1G NCV3065MNTXG NTD24N06LT4G 0R050 0R68 Terminal, PCB Black PK100 PF0553.223 PF0553.153 Value Vishay Vishay Vishay Murata Kemet Vishay Murata Vishay Kemet Koshin Kemet Vishay Degson Degson ON Semiconductor ON Semiconductor ON Semiconductor ON Semiconductor ON Semiconductor ON Semiconductor ON Semiconductor Welwyn Tyco Electronics Vero Pulse Pulse Footprint Manufacturer 1% 0805 1% 0805 1% 0805 5% 0805 10% 0805 1% 0805 +80%/-20% 1210 1% 0805 5% 0805 20% 8x15 5% 0805 1% 0805 SOD-323 SOT-23 SMB SOT-23 5% SOT-123 DFN DPAK 1% 2010 5% 1206 1.02mm - Tolerance Bill of Materials for the NPC3065 SEPIC Demoboard CRCW08051M50FKEA CRCW08051K00FKEA CRCW08051K50FKEA GCM2165C1H272JA16D C0805C682K5RAC CRCW080510K0FKEA GRM32NF51E106ZA01L CRCW080527K0FKEA C0805C104J5RAC KZH-50V121MG4 C0805C331J5GAC-TU CRCW0805390RFKEA DG350-3.50-02 DG350-3.50-03 BAT54HT1G BC817-40LT1G MBRS260T3G MMBT3906LT1G MMSZ24T1G NCV3065MNTXG NTD24N06LT4G LR2010-R05FW RL73K2BR68JTD 20-2137 PF0553.223 PF0553.153 Manufacturer Part Number Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes No No No No No No No Yes Yes Yes No No Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Substitution Lead Allowed Free Comments DN06031/D November 2007, Rev.2 www.onsemi.com 7 DN06031/D Measurements NCP3065 SEPIC Converter - Line regulation, IOUT = 350 mA 0,400 0,390 0,380 0,370 IOUT [A] 0,360 0,350 0,340 0,330 0,320 0,310 0,300 8 9 10 11 12 13 14 15 6chip LED, Vf = 22V 16 17 VIN [V] 18 19 4chip LED, Vf = 14V 20 21 22 23 24 25 23 24 25 2 LEDs, Vf = 7V Figure 6 – Line regulation for IOUT = 350 mA NCP3065 SEPIC Converter - Efficiency, IOUT = 350mA 95 90 η [%] 85 80 75 70 65 8 9 10 11 12 13 14 15 6chip LED, Vf = 22V 16 17 VIN [V] 18 19 4chip LED, Vf = 14V 20 21 22 2 LEDs, Vf = 7V Figure 7 – Efficiency for IOUT = 350 mA November 2007, Rev.2 www.onsemi.com 8 DN06031/D NCP3065 SEPIC Converter - Line regulation, IOUT = 700 mA 0,800 0,780 0,760 0,740 IOUT [A] 0,720 0,700 0,680 0,660 0,640 0,620 0,600 8 9 10 11 12 13 14 15 6chip LED, Vf = 22V 16 17 VIN [V] 18 19 4chip LED, Vf = 14V 20 21 22 23 24 25 23 24 25 2 LEDs, Vf = 7V Figure 8 – Line regulation for IOUT = 700 mA NCP3065 SEPIC Converter - Efficiency, IOUT = 700 mA 95 90 η [%] 85 80 75 70 8 9 10 11 12 13 14 15 6chip LED, Vf = 22V 16 17 VIN [V] 18 4chip LED, Vf = 14V 19 20 21 22 2 LEDs, Vf = 7V Figure 9 – Efficiency for IOUT = 700 mA November 2007, Rev.2 www.onsemi.com 9 DN06031/D NCP3065 SEPIC Converter - Dimming Linearity 700 600 IOUT[mA] 500 400 300 200 100 0 0 10 20 30 40 50 D[%] 60 70 80 90 100 Figure 10 – Dimming linearity, dimming frequency 200Hz Figure 11 – PCB’s top side November 2007, Rev.2 www.onsemi.com 10 DN06031/D Figure 12 – PCB’s bottom side 1 © 2007 ON Semiconductor. Disclaimer: ON Semiconductor is providing this design note “AS IS” and does not assume any liability arising from its use; nor does ON Semiconductor convey any license to its or any third party’s intellectual property rights. This document is provided only to assist customers in evaluation of the referenced circuit implementation and the recipient assumes all liability and risk associated with its use, including, but not limited to, compliance with all regulatory standards. ON Semiconductor may change any of its products at any time, without notice. Design note created by Petr Konvičný, Tomáš Tichý, e-mail: Petr.Konvicny@onsemi.com, Tomas.Tichy@onsemi.com November 2007, Rev.2 www.onsemi.com 11