LM3492AR111DEMO/NOPB

Application Report SNOA568A – November 2011 – Revised April 2013 AN-2192 LM3492 12VAC, 7W LED Driver for AR111 Application ..................................................................................................................................................... 1 Introduction The LM3492 demonstration board included in this package is designed for converting nominal 12VAC from electronic transformer output to drive seven series connected LEDs at 360mA average current. The end user can directly light up a LED string through the demonstration board from an electronic transformer to test out the performance. With the demonstration board, the LED string not only runs at a constant current but also flicker free operation. The LM3492 switching frequency is set at a nominal 1MHz. This is a two layer board using the top layer for component placement and both layers for trace routing. A bill of materials describes the parts used on the demonstration board. A schematic and layouts have also been included. For detailed information regarding the LM3492 device, please refer to LM3492/LM3492Q TwoChannel Individual Dimmable LED Driver with Boost Converter and Fast Current Regulator (SNVS656). 2 Adaptive Peak Current Limit Thanks to the Adaptive Peak Current Limit circuitry, the compatibility of the demonstration board with electronic transformers is greatly enhanced. This circuitry minimizes the peak current limit dynamically according to the loading and input profile. Thus, the input current is continuous throughout every AC halfcycle. 3 Key Features • • • • 4 Applications • • • 5 Drop-in compatible with electronic transformers Excellent compatibility with various electronic transformers Regulated LED current Flicker free operation AR111 Retrofit Industrial and Commercial Lighting Residential Lighting Operating Conditions • • • VIN = 12VAC from electronic transformer Seven series connected single-die white LEDs ILED = 360 mA All trademarks are the property of their respective owners. SNOA568A – November 2011 – Revised April 2013 Submit Documentation Feedback AN-2192 LM3492 12VAC, 7W LED Driver for AR111 Application Copyright © 2011–2013, Texas Instruments Incorporated 1 Demonstration Board Schematic 6 www.ti.com Demonstration Board Schematic Adaptive Peak Current Limit Circuitry RFB3 L1 RS1 D1 D5 D3 AC1 RB VIN 12VAC AC2 D2 D4 CB FB VIN SW CDHC RT D6 VOUT RRT Q6 RFB4 U1 + RFB1 CCDHC VCC VOUT EN RCOMM1 RCOMM2 D8 PGND GND CO1 CO2 RIREF IREF RFB2 7 LEDs RNPN2 FB LM3492 RNPN1 ILIM COMM LGND DIM1/CLK IOUT1 DIM2 IOUT2 D7 - CNPN1 CIOUT RILIM CNPN3 CVCC Q5 Figure 1. Demonstration Board Schematic Diagram 2 AN-2192 LM3492 12VAC, 7W LED Driver for AR111 Application SNOA568A – November 2011 – Revised April 2013 Submit Documentation Feedback Copyright © 2011–2013, Texas Instruments Incorporated Bill of Materials www.ti.com 7 Bill of Materials Ref Designators Descriptions Packages U1 LM3492 HTSSOP-20 L1 Power Inductor, 15uH Q5, Q6 NPN, 40V, 200mA D1, D2, D3, D4, D6 Manufacturers Manufacturer Part # TI LM3492 Sumida CDRH8D38NP-150N SOT-23 Central Semi CMPT3904 Schottky Diode, 60V, 3A SMA Diodes B360A-13-F D5, D7, D8 Schottky Diode, 30V, 100mA SOD-523 Central Semi CMOSH-3 CB Tantalum Cap., 2.2 µF, 25V 1210 Vishay 293D225X0025B2TE3 CO1 Electrolytic Cap., 330 µF, 35V Panasonic EEU-FM1V331L CO2 MLCC, X7R, 2.2 µF, 50V 1206 Murata GCM31CR71H225KA55L CVCC, CCDHC, CIOUT MLCC, 4.7 µF, 6.3V, X5R 0603 Murata GRM188R60J475KE19D CNPN1 MLCC, 2.2 µF, 6.3V, X5R 0603 Murata GRM185R60J225KE26D CNPN3 MLCC, 1 µF, 10V, X5R 0603 Murata GRM188R61A105KA61D FB Ferrite Bead 30ohm@100 MHz 0805 Murata BLM21PG300SN1D RS1 Chip Resistor, 0Ω, 0.5W 1206 Vishay CRCW12060000Z0EA RB Chip Resistor, 4.12Ω, 1% 1206 Vishay CRCW12064R12FKEA RIREF Chip Resistor, 6.19 kΩ, 1% 0603 Vishay CRCW06036K19FKEA RILIM Chip Resistor, 2.8 kΩ, 1% 0603 Vishay CRCW06032K80FKEA RNPN1 Chip Resistor, 100 kΩ, 1% 0603 Vishay CRCW0603100KFKEA RNPN2 Chip Resistor, 3.09 kΩ, 1% 0603 Vishay CRCW06033K09FKEA RRT Chip Resistor, 976 kΩ, 1% 0603 Vishay CRCW0603976KFKEA RCOMM1 Chip Resistor, 52.3 kΩ, 1% 0603 Vishay CRCW060352K3FKEA RCOMM2 Chip Resistor, 7.87 kΩ, 1% 0603 Vishay CRCW06037K87FKEA RFB1, RFB3 Chip Resistor, 63.4 kΩ, 1% 0603 Vishay CRCW060363K4FKEA RFB2, RFB4 Chip Resistor, 5.23 kΩ, 1% 0603 Vishay CRCW06035K23FKEA Wire AC1, Wire AC2 Green, AWG#20, L = 10cm, 105°C Wire + Red, AWG#22, L = 10cm, 105°C Wire - Black, AWG#22, L = 10cm, 105°C SNOA568A – November 2011 – Revised April 2013 Submit Documentation Feedback AN-2192 LM3492 12VAC, 7W LED Driver for AR111 Application Copyright © 2011–2013, Texas Instruments Incorporated 3 Demonstration Board Wiring Overview 8 www.ti.com Demonstration Board Wiring Overview Electronic Transformer 12VAC Output AC1 AC2 LED Board + 7 LEDs _ C 2011 NSC Terminal Designation Description AC1, AC2 12VAC supply from electronic transformer + LED string positive (+ve) connection - LED string negative (-ve) connection Figure 2. Evaluation Setup Connection Diagram 4 AN-2192 LM3492 12VAC, 7W LED Driver for AR111 Application SNOA568A – November 2011 – Revised April 2013 Submit Documentation Feedback Copyright © 2011–2013, Texas Instruments Incorporated Typical Performance and Waveform www.ti.com 9 Typical Performance and Waveform All curves taken at VIN = 8~14VAC, 50Hz for driving a LED string (Philips Lumileds Luxeon Rebel White LED) under TA = 25oC, unless otherwise specified. Details of Modification A and Modification B are shown in the Modification List table. The waveform taken at VLINE = 220VAC, 50Hz with configuration according to Figure 2 with OSRAM ETPARROT electronic transformer for driving seven series connected LEDs (Philips Lumileds Luxeon Rebel White LED) with 20V forward voltage under TA = 25oC. 90 450 Original - 7 LEDs Original - 7 LEDs EFFICIENCY, (%) ILED(mA) 400 350 Mod A - 8 LEDs 300 250 80 70 Mod B - 9 LEDs Mod B - 9 LEDs Mod A - 8 LEDs 200 60 8 9 10 11 12 VIN(VAC) 13 14 8 Figure 3. LED Current vs VIN @ TA=25oC 9 10 11 12 VIN(VAC) 13 14 Figure 4. Efficiency vs VIN @ TA=25oC Figure 5. Steady State Operation (2ms/DIV) Modification List Version # of LEDs LED Current RFB2, RFB4 RIREF Original 7 360mA 5.23kΩ 6.19kΩ Mod A 8 340mA 4.53kΩ 6.65kΩ Mod B 9 300mA 4.12kΩ 7.68kΩ SNOA568A – November 2011 – Revised April 2013 Submit Documentation Feedback AN-2192 LM3492 12VAC, 7W LED Driver for AR111 Application Copyright © 2011–2013, Texas Instruments Incorporated 5 Compatible Electronic Transformer List 10 www.ti.com Compatible Electronic Transformer List All tests were conducted at VLINE = 220VAC, 50Hz with configuration according to Figure 2 for driving seven series connected LEDs (Philips Lumileds Luxeon Rebel White LED) with 20V forward voltage under TA = 25oC, unless otherwise specified. This Demonstration Board was designed to operate with various electronic transformers. The following listed electronic transformers were tested with and compatible with the demonstration board. The demonstration board is not ensured to be compatible with the listed electronic transformers owning to the manufacturing variation of electronic transformers. • PHILIPS ET-E 50 • PHILIPS ET-E 60 • OSRAM ET-PARROT • OSRAM ET-P60 • OSRAM ET-Z60 • OPPLE DB35-220 • OPPLE DB602-220 • NVC ET50S • CDN CS60 11 PCB Layout Ø 40 mm Figure 6. Top Overlay 6 AN-2192 LM3492 12VAC, 7W LED Driver for AR111 Application SNOA568A – November 2011 – Revised April 2013 Submit Documentation Feedback Copyright © 2011–2013, Texas Instruments Incorporated PCB Layout www.ti.com Ø 40 mm Figure 7. Top Layer Ø 40 mm Figure 8. Bottom Overlay SNOA568A – November 2011 – Revised April 2013 Submit Documentation Feedback AN-2192 LM3492 12VAC, 7W LED Driver for AR111 Application Copyright © 2011–2013, Texas Instruments Incorporated 7 PCB Layout www.ti.com Ø 40 mm Figure 9. Bottom Layer 8 AN-2192 LM3492 12VAC, 7W LED Driver for AR111 Application SNOA568A – November 2011 – Revised April 2013 Submit Documentation Feedback Copyright © 2011–2013, Texas Instruments Incorporated IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All semiconductor products (also referred to herein as “components”) are sold subject to TI’s terms and conditions of sale supplied at the time of order acknowledgment. TI warrants performance of its components to the specifications applicable at the time of sale, in accordance with the warranty in TI’s terms and conditions of sale of semiconductor products. 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