TND373 ONSEMI | Alldatasheet
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Rev. 0, Oct - - 2009 Reference Design Documentation Package
1 W to 5 W LED Driver for MR16 LED
http://onsemi.com Disclaimer: ON Semiconductor is providing this reference design documentation package “AS IS” and the recipient assumes all risk associated with the use and/or commercialization of this design package. No licenses to ON Semiconductor’s or any third party’s Intellectual Property is conveyed by the transfer of this documentation. This reference design documentation package is provided only to assist the customers inevaluation and feasibility assessment of the reference design. It is expected that users may make further refinements to meet specific performance goals.
than ±20% over process tolerance and temperature. supply and still maintain targeted output current regulation. Figure 1. Simplified Block Diagram
12 VACIN
energy is transferred to the load. Figure 2. Buck- -Boost Operation
application if the pulsing had a low frequency component. Figure 8. Pulsed Feedback Resistor little input capacitance is used past the full bridge rectifier. input to the converter is a full wave rectified sine wave. average current by ~20% when operating with AC input. increase thermal dissipation.
Figure 9. Pulsed Feedback Resistor current limit function of the NCP3065. characteristics when moving to the higher power design.
Figure 14. Reference Design output will connect to the cathode of the LED. that will cause the device to turn off.
http://onsemi.com SCHEMATIC Figure 15.
http://onsemi.com T a b l e1 .B I L LO FM A T E R I A L S Qty Ref Value Part Number Description Manufacturer 1 F1 4A 0457004.NR Fuse LittleFuse
1 C3 10 mF GRM31MF51A106ZA01L Ceramic Chip Capacitor Murata
1 C6 1n F GRM188R71H102KA01D Ceramic Chip Capacitor Murata
1 C1 1 mF GRM188R61E105KA12D Ceramic Chip Capacitor Murata
1 C2 5.6 nF GRM188R71H562KA01D Ceramic Chip Capacitor Murata
1 C4 10 mF GRM32NF51E106ZA01L Ceramic Chip Capacitor Murata
1 C5 10 mF GRM32NF51E106ZA01L Ceramic Chip Capacitor Murata
1 D1 1A ,3 0V MBR130T1G DIODE, SCHOTTKY ON Semiconductor
1 D2 1A ,3 0V MBR130T1G DIODE, SCHOTTKY ON Semiconductor
1 D3 1A ,3 0V MBR130T1G DIODE, SCHOTTKY ON Semiconductor
1 D4 1A ,3 0V MBR130T1G DIODE, SCHOTTKY ON Semiconductor
1 D6 2A ,6 0V MBRS260T3 DIODE, SCHOTTKY ON Semiconductor
1 Q1 PNP MBT3946DW1T1 General Purpose NPN Transistor ON Semiconductor
1 D5 0.2 A, 100 V MMSD4148T1 Diode, Small Signal ON Semiconductor 1 D8 0.2 A, 100 V MMSD4148T1 Diode, Small Signal ON Semiconductor
1 Z1 36 V MM5Z36VT1 DIODE, ZENER ON Semiconductor
1 L1 68 mH MSS1278-683MLD INDUCTOR, SM Coilcraft
1 U1 40 V 1.5 A NCP3065DR2G Switching Regulator ON Semiconductor
1 M1 P- -FET NTGS4111PT1G MOSFET, P ON Semiconductor
1 R4 1.2k CRCW04021K20FKED Resistor Vishay / Dale
1 R1 100 CRCW0402100RFKED Resistor Vishay / Dale
1 R3 162k CRCW0402162KFKED Resistor Vishay / Dale
1 R6 196 CRCW0402196RFKED Resistor Vishay / Dale
1 R7 22k CRCW040222K0FKED Resistor Vishay / Dale
1 R5 22k CRCW040222K0FKED Resistor Vishay / Dale
1 R2 1k CRCW04021K00FKED Resistor Vishay / Dale
1 R9 200 CRCW0402200RFKED Resistor Vishay / Dale
1 R8 0.25 CSR1/20.25FICT-ND Resistor Vishay / Dale