Electronic Transformer Compatible Step-down Converter for 7W/10W MR16 Lamp with ILD4001 & BSR302N Application Note Revision: 1.1 Date: 23 July 2013 Power Management and Multimarket Edition 2013-07-23 Published by Infineon Technologies AG 81726 Munich, Germany © 2013 Infineon Technologies AG All Rights Reserved. LEGAL DISCLAIMER THE INFORMATION GIVEN IN THIS APPLICATION NOTE IS GIVEN AS A HINT FOR THE IMPLEMENTATION OF THE INFINEON TECHNOLOGIES COMPONENT ONLY AND SHALL NOT BE REGARDED AS ANY DESCRIPTION OR WARRANTY OF A CERTAIN FUNCTIONALITY, CONDITION OR QUALITY OF THE INFINEON TECHNOLOGIES COMPONENT. THE RECIPIENT OF THIS APPLICATION NOTE MUST VERIFY ANY FUNCTION DESCRIBED HEREIN IN THE REAL APPLICATION. INFINEON TECHNOLOGIES HEREBY DISCLAIMS ANY AND ALL WARRANTIES AND LIABILITIES OF ANY KIND (INCLUDING WITHOUT LIMITATION WARRANTIES OF NON-INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OF ANY THIRD PARTY) WITH RESPECT TO ANY AND ALL INFORMATION GIVEN IN THIS APPLICATION NOTE. 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Application Note AN-EVAL Electronic Transformer Compatible Step-down Converter for 7W/10W MR16 Lamp with ILD4001 & BSR302N Application Note AN-EVAL Revision History: 23 July 2013 Previous Revision: Previous_Revision_Number Page Subjects (major changes since last revision) Application Note AN-EVAL, 1.1 3 / 14 23 July 2013 ILD4001 Electronic Transformer Compatible Step-down Converter for 7W/10W MR16 Lamp with ILD4001 & BSR302N Table of Contents 1 Introduction ..................................................................................................................................................... 5 2 Application Information............................................................................................................................... 6 3 Measurement Results .................................................................................................................................. 8 4 References ..................................................................................................................................................... 13 List of Figures Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 ILD4001 ............................................................................................................................................................. 5 Schematic of the demonstration board ........................................................................................................ 6 PCB layout of the demonstration board ....................................................................................................... 6 PCB photo of the 7 W demonstration board ............................................................................................... 7 PCB photo of the 10 W demonstration board ............................................................................................. 7 Output waveform for the 7 W MR16 board driven by Philips ET-E60. .................................................... 9 Output waveform for the 10 W MR16 board driven by Tridonic TE0060. ............................................. 10 Test setup of 3pcs of 10 W MR16 driven by Osram HTM105 ................................................................ 11 Output waveform for the 7 W MR16 board driven by Osram HTM105. ................................................ 12 List of Tables Table 1 Table 2 Table 3 Table 4 Table 5 Table 6 Table 7 MR16 7 W operating specification ................................................................................................................ 5 MR16 10 W operating specification .............................................................................................................. 6 Bill-of-Materials ................................................................................................................................................ 8 7 W board measurement results with Philips ET-E60. .............................................................................. 9 10 W board measurement results with Tridonic TE0060. ....................................................................... 10 3pcs of 7 W board measurement results with Osram HTM105. ............................................................ 11 Electronic transformers list .......................................................................................................................... 12 Application Note AN-EVAL, 1.1 4 / 14 23 July 2013 Application Note AN-EVAL Electronic Transformer Compatible Step-down Converter for 7W/10W MR16 Lamp with ILD4001 & BSR302N 1 Introduction 1.1 Features Deliver 7 W / 10 W power Temperature shut down mechanism Compatible with electronic transformer Low LED current drift over temperature Integrated push-pull stage for fast on/off switching Minimum external component required Small package: SC-74 Figure 1 1.2 ILD4001 Description This document contains the information about the demo board with the device ILD4001 LED driver which is suitable for the use in an MR16 lamp. ILD4001 is a hysteretic buck LED controller IC for industrial applications. The demo board has two input connections to be powered up by 12 V AC from electronic transformer, and two output connections to the LED. The boards are preset to deliver 7 W or 10 W powers into the LED load. These MR16 boards are suitable and tested to drive 2 LEDs in series and 4 LEDs (2 LEDs in series and 2 in parallel). For 4 LEDs design, it is recommended to use the LED with the same forward voltage to ensure the current matching for the LEDs in parallel. 1.3 Operating specification This demo board for MR16 application is based on the ILD4001 buck converter. The objective of this demo board is to provide a constant DC current to the LED load in order to eliminate the flickering issue caused by the electronic transformers. Since the output current to the LEDs is constant DC current, regardless of the input voltage is either 12 V AC, 12 VDC or 12 VAC from electronic transformer, the MR16 board is able to maintain the constant current deliver to the load. Therefore this solution is not only applicable to retrofit replacement market for 7 W and 10 W MR16 solutions; it is also suitable for the new installation market which generally using a constant voltage supply. Below table are the MR16’s target specification driven by an electronic transformer: Table 1 MR16 7 W operating specification Input voltage to electronic transformer Output LED voltage (2 LEDs in series) Output LED current 230 VAC 6.5 V 0.77 A Input Power ~7W Application Note AN-EVAL, 1.1 5 / 14 23 July 2013 Application Note AN-EVAL Electronic Transformer Compatible Step-down Converter for 7W/10W MR16 Lamp with ILD4001 & BSR302N Table 2 MR16 10 W operating specification Input voltage to electronic transformer Output LED voltage (2 LEDs in series) 230 VAC 6.6 V Output LED current Input Power 1.02 A ~ 10 W 2 Application Information 2.1 Schematic Figure 2 Schematic of the demonstration board The value of R1, R2, C1 and C2 are different for 7 W and 10 W boards. Please refer to Table 3. Bills of material for details. Figure 3 PCB layout of the demonstration board Application Note AN-EVAL, 1.1 6 / 14 23 July 2013 Application Note AN-EVAL Electronic Transformer Compatible Step-down Converter for 7W/10W MR16 Lamp with ILD4001 & BSR302N 2.2 PCB Photo for 7 W Application Figure 4 PCB photo of the 7 W demonstration board 2.3 PCB Photo for 10 W Application Figure 5 PCB photo of the 10 W demonstration board Application Note AN-EVAL, 1.1 7 / 14 23 July 2013 Application Note AN-EVAL Electronic Transformer Compatible Step-down Converter for 7W/10W MR16 Lamp with ILD4001 & BSR302N Table 3 Bill-of-Materials Symbol Value IC1 ILD4001 R1 0.15 1 2 Open / 0.47 R2 R5 D1 ~ D5 Q1 C1 Unit 10 B330A-13-F 470 / 330 1 2 2 Manufacturer Comment SC-74 INFINEON Hysteretic Buck controller and LED driver Ω 0805 Part of the current sense resistor Ω kΩ 0805 0805 SMA Part of the current sense resistor DIODES 3.0 A Surface Mount Schottky Barrier Rectifier SC-59 INFINEON OPTIMOS 2 Small Signal Transistor BSR302N 1 Size Gate resistor F Electrolytic capacitor, 25 V F Electrolytic capacitor, 25 V C2 C4 Open / 330 4.7 F 0805 Ceramic, 50 V C5 10 F 0805 Ceramic, 50 V R1 0.56 Ω 0805 SMD resistor R2 L1 0.56 2.7 Ω H 0805 3 x 4 mm SMD resistor TAIYO YUDEN Inductor L2 33 H 8 x 8 mm TAIYO YUDEN Shielded Power Inductor The demo boards are available for evaluation. For the 7 W board, the board name is “MR16 7W BOARD” and the product ID is “SP000960028”. For the 10 W board, the board name is “MR16 10W BOARD” and the product ID is “SP000960030”. Please contact your local sales representative to order the demo boards. 3 Measurement Results 3.1 Driven by electronic transformer The MR16 boards were tested with different brand of electronic transformers in the market. In this session, some of the measurement results and output waveform of the LED load will be shown. 3 cases are chosen to be included in this application note are: 1. 7 W MR16 driven by Philips ET-E60. 2. 10 W MR16 driven by Tridonic TE0060. 3. 3pcs of 7 W MR16 driven by Osram HTM105. The electronic transformers list will be provided in session 3.5. 1 2 For 7 W version For 10 W version Application Note AN-EVAL, 1.1 8 / 14 23 July 2013 Application Note AN-EVAL Electronic Transformer Compatible Step-down Converter for 7W/10W MR16 Lamp with ILD4001 & BSR302N 3.2 7 W MR16 driven by Philips ET-E60 The 7 W MR16 board were tested with the Philips’s electronic transformer. Below tables and figures show the measurement results for the MR16 board driven by the electronic transformer. The test was carried out using 2 pcs of LEDs in series as load and the temperature condition at room temp 25°C. For the input power measurement, the input power is measured at the input mains 230 V AC by using the digital power meter WT210. The output power is measured by the oscilloscope with the mathematic function by multiplication of the LED voltage and LED current. Figure 6 shows the output waveforms. Channel 1 (Yellow) is Vf of the LEDs, Channel 2 (Green) is ILED and Channel M (Purple) is output power. Table 4 7 W board measurement results with Philips ET-E60. 230 VAC Input voltage to electronic transformer V f(avg) I LED(avg) P in P 6.45 V 777 mA 6.94 W 5.08 W 73.2 % out Efficiency Figure 6 Output waveform for the 7 W MR16 board driven by Philips ET-E60. Application Note AN-EVAL, 1.1 9 / 14 23 July 2013 Application Note AN-EVAL Electronic Transformer Compatible Step-down Converter for 7W/10W MR16 Lamp with ILD4001 & BSR302N 3.3 10 W MR16 driven by Tridonic TE0060 A single 10 W MR16 were tested with Tridonic TE0060 and the results as shown in Table 5 and Figure 7. The load condition and temperature condition are the same in session 3.2. The measurement of input power and output power are also the same as in session 3.2. Table 5 10 W board measurement results with Tridonic TE0060. 230 VAC Input voltage to electronic transformer V f(avg) I LED(avg) P in P 6.63 V 1.05 A 9.8 W 7.1 W 72.4 % out Efficiency Figure 7 Output waveform for the 10 W MR16 board driven by Tridonic TE0060. Application Note AN-EVAL, 1.1 10 / 14 23 July 2013 Application Note AN-EVAL Electronic Transformer Compatible Step-down Converter for 7W/10W MR16 Lamp with ILD4001 & BSR302N 3.4 3pcs of 7 W MR16 driven by Osram HTM105 3pcs of 7 W MR16 were tested with an Osram HTM105. The temperature condition is at room temp 25°C. The setup is shown in Figure 8. The input power is directly measured at the power supply source by power meter WT210. In this case, the total output power is measured each lamp individually and sum up together, i.e. P out = Pout1 + Pout2 + Pout3. In fact the output power of each lamp is not exactly the same due to the forward voltage of the LEDs are different. Figure 9 shows the single channel output waveform of the 7 W MR16 lamp. The overall system efficiency for this case is 74%. The Osram HTM105 is suitable to drive 1, 2 or up to 3 pcs of 7 W MR16 lamp without any flickering issue. For 10 W MR16, it could drive up to maximum of 2 lamps. Figure 8 Table 6 Test setup of 3pcs of 10 W MR16 driven by Osram HTM105 3pcs of 7 W board measurement results with Osram HTM105. 230 VAC Input voltage to electronic transformer V f(avg) I LED(avg) P in P 6.62 V 775 mA 21.83 W 16.17 W 74 % out Efficiency Application Note AN-EVAL, 1.1 11 / 14 23 July 2013 Application Note AN-EVAL Electronic Transformer Compatible Step-down Converter for 7W/10W MR16 Lamp with ILD4001 & BSR302N Figure 9 Output waveform for the 7 W MR16 board driven by Osram HTM105. 3.5 Electronic transformer list The 7 W and 10 W MR16 boards are tested and compatible with below electronic transformers. The number indicated in the table represents the number of MR16 lamp can be driven by the electronic transformer. For a 60W rated electronic transformer, it can only drive a 7 W MR16 or 10 W MR16. The reason is because the 7 W MR16 is to replace a 35 W halogen bulb, so it can only be 1 to 1 replacement. It is also applicable to 10 W MR16 for the replacement of a 50 W halogen bulb. For the Osram HTM105, the power rated at 105W. It is capable to drive either 3 pcs of 35 W halogen bulb or 2 pcs of 50W halogen bulb. Therefore, for the retrofit MR16 replacement, it is also suitable to drive 3 pcs of 7 W MR16 or 2 pcs of 10 W MR16. Dimmer list IS NOT included in this application note as this solution is not meant for dimmable solution. Magnetic transformer list IS ALSO NOT included in this application note as this solution has not been tested with the magnetic transformer in the lab. Table 7 Electronic transformers list E- transformer Model Philips ET-E60 Osram ET-A60 Osram HTM 105 Tridonic TE-0060 Application Note AN-EVAL, 1.1 7 W MR16 10 W MR16 1 1 1 1 1,2 or 3 1 1 or 2 1 12 / 14 23 July 2013 Application Note AN-EVAL Electronic Transformer Compatible Step-down Converter for 7W/10W MR16 Lamp with ILD4001 & BSR302N 4 References Please refer to the ILD4001 Datasheet for more information: http://www.infineon.com/dgdl/ILD4001-Step-down-LED-ControllerRev2.0.pdf?folderId=db3a30431f848401011fcbf2ab4c04c4&fileId=db3a30433072cd8f01308fc1af03786b Please refer to the AN213 Application note for more information: http://www.infineon.com/dgdl/AN213.pdf?folderId=db3a304313b8b5a60113d4239297042f&fileId=db3a304330d d34290130e5572ce63ea5 Application Note AN-EVAL, 1.1 13 / 14 23 July 2013 www.infineon.com Published by Infineon Technologies AG AN-EVAL