DEMO MANUAL DC1775A LT3799 TRIAC Dimmable Off-Line Isolated LED Driver with PFC DESCRIPTION Demonstration circuit 1775A is an off-line isolated flyback LED driver featuring the LT®3799. The demo board provides a constant-current output of 0.5A over an LED string voltage of 20V and 30V. It is optimized to operate over a wide AC input voltage range (90VAC to 270VAC). LED current typically stays within ±4% over the whole input voltage range. The DC1775A provides a steep decline in LED current with decreasing TRIAC dimming angle, to achieve a wide TRIAC dimming range. It is designed to comply with IEC 61000-3-2 Class C harmonics standard and EN55015B conducted EMI standard. The LT3799 controls an isolated flyback converter in boundary mode. Its unique bleeder circuit makes the LED driver compatible with TRIAC dimmers without additional components. Its novel current sensing scheme delivers a PERFORMANCE SUMMARY well-regulated output current to the secondary side without using an opto-coupler. Open- and shorted-LED protection ensures long-term reliability. The LT3799 is available in a low profile, thermally-enhanced 16-lead MSOP package. The LT3799 data sheet gives a complete description of the part, operation and application information. The data sheet must be read in conjunction with this quick start guide for demo circuit 1775A. Design files for this circuit board are available at http://www.linear.com/demo L, LT, LTC, LTM, μModule, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. (TA = 25°C) PARAMETER CONDITIONS Input Range Line Frequency, 47Hz to 63Hz Output Current VIN = 120VAC, VLED = 28V Output Voltage Open LED Voltage MIN TYP MAX UNITS 90 120 270 VAC 0.5 20 (Note 1) 28 34 A 30 V V Note 1: For applications with low LED string voltage, FB pin divider resistor R6 and output clamp D3 can be adjusted to reduce the open voltage limit. See Protection from Open LED and Shorted LED Faults section in the LT3799 data sheet for details. dc1775afa 1 DEMO MANUAL DC1775A QUICK START PROCEDURE IMPORTANT NOTE TO CUSTOMERS: HIGH VOLTAGES ARE PRESENTED ON THE DEMO CIRCUIT, AND CAN LEAD TO LETHAL INJURIES TO HUMAN BODY. ONLY QUALIFIED PERSONNEL SHOULD OPERATE IT. IT IS STRONGLY RECOMMENDED TO USE SAFETY GLASSES AND AN ISOLATION TRANSFORMER. NOTE. IMPROPER COMPONENTS REPLACEMENT ON THE DEMO CIRCUIT CAN CAUSE PERFORMANCE DETERIORATIONS, CIRCUIT MALFUNCTION, PROPERTY DAMAGE, AND EVEN LIFE-THREATENING INJURIES. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERS FOR PROPER COMPONENT REPLACEMENT. Demonstration circuit 1775A is easy to set up to evaluate the performance of the LT3799. Refer to Figure 1 for proper measurement equipment setup and follow the procedure below: 1. Connect a 0.5A LED string with forward voltage less than 30V, but greater than 20V, between LED+ and LED– terminals. 2. With power off, connect the input power supply to line (L) input and neutral (N) input. 3. Turn on the power at the input. Note: Make sure that the input voltage does not exceed the maximum input voltage (270VAC). 4. Check for the proper output current. Once the proper output current is established, adjust the input voltage and/or the load and observe the output current regulation, efficiency, power factor and other parameters. Figure 1. Proper Measurement Equipment Setup dc1775afa 2 DEMO MANUAL DC1775A QUICK START PROCEDURE 95 0.95 90 0.90 POWER FACTOR 1.00 EFFICIENCY (%) 100 85 80 0.85 0.80 0.75 75 70 0.70 90 110 130 150 170 190 210 230 250 270 VIN (ACRMS) Figure 2. Efficiency vs Input Voltage 90 110 130 150 170 190 210 230 250 270 VIN (ACRMS) Figure 3. Power Factor vs Input Voltage Input Line Voltage and Current VINAC 200V/DIV VINAC 200V/DIV IINAC 0.2A/DIV IINAC 0.2A/DIV 5ms/DIV 5ms/DIV Figure 4. VIN = 90VAC Figure 5. VIN = 270VAC Switch Node Voltage VSW 100V/DIV VSW 100V/DIV 5μs/DIV 5μs/DIV Figure 6. VIN = 90VAC Figure 7. VIN = 270VAC dc1775afa 3 DEMO MANUAL DC1775A QUICK START PROCEDURE Output Voltage and Switch Node Voltage During Output Open IC_VIN 20V/DIV IC_VIN 20V/DIV VOUT 20V/DIV VOUT 20V/DIV VSW 200V/DIV VSW 200V/DIV 200ms/DIV 200ms/DIV Figure 8. VIN = 90VAC Figure 9. VIN = 270VAC Output Current and Switch Node Voltage During Output Short IC_VIN 20V/DIV IC_VIN 20V/DIV IOUT 2A/DIV IOUT 2A/DIV VSW 200V/DIV VSW 200V/DIV 100ms/DIV 100ms/DIV Figure 10. VIN = 90VAC Figure 11. VIN = 270VAC LED Current vs TRIAC Dimming Angle 0.50 0.45 0.40 ILED (A) 0.35 0.30 220VAC 50Hz APPLICATION 0.25 0.20 120VAC 60Hz APPLICATION 0.15 0.10 0.05 0 0 30 90 120 150 60 TRIAC DIMMING ANGLE (DEGREES) 180 Figure 12. LED Current vs TRIAC Dimming Angle: Solid Line, 120VAC 60Hz; Dot Line, 220VAC 50Hz. Note: For Different Types of TRIAC Dimmers, the Maximum and/or Minimum Dimming Angle May Vary, Which Gives Different Maximum and/or Minimum LED Current dc1775afa 4 DEMO MANUAL DC1775A QUICK START PROCEDURE Input Voltage and Switch Node Voltage with 120VAC, 60Hz TRIAC Dimmer VINAC 200V/DIV VINAC 200V/DIV VSW 200V/DIV VSW 200V/DIV 5ms/DIV 5ms/DIV Figure 13. 165 Degree TRIAC Dimming Angle Figure 14. 35 Degree TRIAC Dimming Angle Input Voltage and Switch Node Voltage with 220VAC, 50Hz TRIAC Dimmer VINAC 200V/DIV VINAC 200V/DIV VSW 200V/DIV VSW 200V/DIV 5msV/DIV 5ms/DIV Figure 15. 165 Degree TRIAC Dimming Angle Figure 16. 35 Degree TRIAC Dimming Angle dc1775afa 5 DEMO MANUAL DC1775A PARTS LIST ITEM QTY REFERENCE Required Circuit Components 1 1 B1 2 1 C1 3 1 C2 4 1 C3 5 2 C4, C5 6 1 C6 7 1 C7 8 1 C8 9 1 C9 10 2 C10, C13 11 1 C11 12 1 C12 13 1 D1 14 2 D2, D6 15 1 D3 16 1 D4 17 1 D5 18 1 F1 19 1 L1 20 1 L2 21 1 Q1 22 1 Q2 23 2 R1, R2 24 2 R3, R21 25 1 R4 26 2 R5, R17 27 1 R6 28 4 R7, R8, R12, R13 29 1 R9 30 1 R10 31 1 R11 32 1 R14 33 1 R15 34 1 R16 35 1 R18 36 1 R19 37 1 R20 38 1 R22 39 1 T1 40 1 U1 41 1 V1 42 1 Hardware-For Demo Board Only: 1 4 E1, E2, E4, E5 2 PART DESCRIPTION MANUFACTURER/PART NUMBER RECTIFIER, BRIDGE GP 600V 0.8A MINIDIP CAP., MKP 0.047μF 310VAC 20% CAP., POLY 220nF 450V 10% CAP., POLYESTER FILM 47nF 400V 10% CAP., ALUM 330μF 50V 20% RADIAL CAP., CERAMIC 10μF 50V 10% 1210 CAP., Y5U 2200pF 400VAC 20% CAP., NPO 4.7pF 50V ±0.25PF 0603 CAP., X5R 2.2μF 16V 20% 0603 CAP., X7R 0.1μF 16V 10% 0603 CAP., X5R 4.7μF 25V 10% 0805 CAP., X7R 0.022μF 25V 10% 0603 DIODE, SCHOTTKY 1A/200V POWERDI-123 DIODE, SWITCH 400MA 150V SOD123 DIODE, ZENER 1.5W TVS UNIDIRECT 600W 170V SMB DIODE, ULTRAFAST RECOVERY RECTIFIER SOD123 FUSE, 1A IND, 750μH IND, 39mH COMMON MODE CHOKE MOSFET N-CHAN., 650V/7A TO-220F TRANS., PNP 40V 300MW SMD SOT23-3 RES., CHIP 249Ω 0.5W 1% 1210 RES., CHIP 100k 0.06W 5% 0603 RES., CHIP 8.06k 0.25W 1% 1206 RES., CHIP 20Ω 0.06W 5% 0603 RES., CHIP 4.53k 0.06W 1% 0603 RES., CHIP 499k 0.25W 1% 1206 RES., CHIP 130k 0.25W 1% 1206 RES., CHIP 2k 0.06W 5% 0603 RES., CHIP 590k 0.06W 1% 0603 RES., CHIP 100k 0.25W 5% 1206 RES., CHIP 32.4k 0.06W 1% 0603 RES., CHIP 3.48k 0.06W 1% 0603 RES., CHIP 40.2k 0.06W 1% 0603 RES., CHIP 15k 0.06W 5% 0603 RES., CHIP 0.1Ω 0.25W 1% 1206 RES., CHIP 10.7k 0.06W 1% 0603 XFMR., 700μH, 10kHz ±10% IC, TRIAC DIMMABLE OFFLINE LED DRIVER VARISTOR 320VRMS 13.5MM RADIAL FAB, 1775A REV 4. PCB DIODES INC., HD06-T VISHAY, BFC233921473 RUBYCON, 450MMK224K VISHAY, BFC237051473 PANASONIC, EEU-FR1H331L MURATA, GRM32ER71H106KA12L VISHAY, 440LD22-R AVX, 06035A4R7CAT2A TDK, C1608X5R1C225M AVX, 0603YC104KAT2A AVX, 08053D475KAT2A AVX 06033C223KAT1A DIODES INC., DFLS1200-7 DIODES INC., BAV20W-7-F CENTRAL SEMI, CMZ5938B TR DIODES INC., SMBJ170A-13-F CENTRAL SEMI., CMMR1U-06 COOPER BUSSMANN, 1025FA1-R WURTH, 750311431 WURTH, 744821039 FAIRCHILD SEMI., FQPF7N65C DIODES INC., MMBT3906-7-F VISHAY, CRCW1210249RFKEA YAGEO, RC0603JR-07100KL YAGEO, RC1206FR-078K06L YAGEO, RC0603JR-0720RL YAGEO, RC0603FR-074K53L YAGEO, RC1206FR-07499KL VISHAY, CRCW1206130KFKEA YAGEO, RC0603JR-072KL VISHAY, CRCW0603590KFKEA VISHAY, CRCW1206100KJNEA VISHAY, CRCW060332K4FKEA YAGEO, RC0603FR-073K48L VISHAY, CRCW060340K2FKEA YAGEO, RC0603JR-0715KL YAGEO, PT1206FR-070R1L VISHAY, CRCW060310K7FKEB WURTH ELEKTRONIK, 7508111417 LINEAR TECH., LT3799EMSE#PBF VISHAY, VDRS10P320BSE DEMO CIRCUIT 1775A TURRET, TESTPOINT STENCIL (TOP AND BOTTOM) MILL MAX, 2501-2-00-80-00-00-07-0 STENCIL DC1775A dc1775afa 6 DEMO MANUAL DC1775A SCHEMATIC DIAGRAM dc1775afa Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. 7 DEMO MANUAL DC1775A DEMONSTRATION BOARD IMPORTANT NOTICE Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions: This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations. If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES. The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or agency certified (FCC, UL, CE, etc.). No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind. LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive. Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and observe good laboratory practice standards. Common sense is encouraged. This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC application engineer. Mailing Address: Linear Technology 1630 McCarthy Blvd. Milpitas, CA 95035 Copyright © 2004, Linear Technology Corporation dc1775afa 8 Linear Technology Corporation LT 0212 REV A • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com © LINEAR TECHNOLOGY CORPORATION 2012