LM3445-120VSMEV/NOPB

User's Guide SNVA401G – May 2009 – Revised May 2013 AN-1978 LM3445 120VAC Small Evaluation Board 1 Introduction The demonstration board included in this shipment converts 90VAC to 135VAC input, and drives six, to thirteen series connected LED’s at 350 mA average current. The LM3445 switching frequency ranges from about 70 kHz with six series connected LEDS, to about 110 kHz with thirteen series connected LEDs. The switching frequency can be modified to optimize performance,. This is a four-layer board using the bottom and top layer for component placement. The demonstration board can be modified to adjust the LED forward current, the number of series connected LEDs and switching frequency.. . A bill of materials included describes the parts used on this demonstration board. A schematic and layout have also been included below along with measured performance characteristics. The above restrictions for the input voltage are valid only for the demonstration board as shipped with the schematic below. The board is currently set up to drive six to thirteen series connected LEDs, but the evaluation board may be modified to accept fewer series LEDs. Please refer to the LM3445 Triac Dimmable Offline LED Driver (SNVS570) data sheet for further explanation, instruction, and details. 2 Evalution Board Operating Conditions VIN = 90VAC to 135VAC Six to thirteen series connected LEDs ILED = 350 mA All trademarks are the property of their respective owners. SNVA401G – May 2009 – Revised May 2013 Submit Documentation Feedback AN-1978 LM3445 120VAC Small Evaluation Board Copyright © 2009–2013, Texas Instruments Incorporated 1 Simplified LM3445 Schematic and Efficiency Plot 3 www.ti.com Simplified LM3445 Schematic and Efficiency Plot V+ VBUCK D2 C6 + D7 BR1 C12 D6 C10 D5 R3 VLED + C13 Q1 TRIAC DIMMER - R14 VLEDD3 D1 VAC Energy Efficient Triac Holding Circuitry D8 Q5 C7 L3 U1 LM3445 1 ASNS BLDR 10 ICOLL R15 2 FLTR1 3 DIM VCC 9 C14 Q7 GATE 8 4 COFF ISNS 7 5 FLTR2 GND 6 R22 C15 C17 Figure 1. LM3445 Schematic 2 AN-1978 LM3445 120VAC Small Evaluation Board Copyright © 2009–2013, Texas Instruments Incorporated SNVA401G – May 2009 – Revised May 2013 Submit Documentation Feedback Simplified LM3445 Schematic and Efficiency Plot www.ti.com 95.0 12 series connected LEDs @ 350 mA EFFICIENCY (%) 90.0 85.0 8 series connected LEDs @ 350 mA 80.0 75.0 80 90 100 110 120 130 140 LINE VOLTAGE (VAC ) Figure 2. Efficiency Plot WARNING The LM3445 evaluation boards have no isolation or any type of protection from shock. Caution must be taken when handling evaluation board. Avoid touching evaluation board, and removing any cables while evaluation board is operating. Isolating the evaluation board rather than the oscilloscope is highly recommended. WARNING This LM3445 evaluation PCB is a non-isolated design. The ground connection on the evaluation board is NOT referenced to earth ground. If an oscilloscope ground lead is connected to the evaluation board ground test point for analysis, and AC power is applied, the fuse (F1) will fail open. The oscilloscope should be powered via an isolation transformer before an oscilloscope ground lead is connected to the evaluation board. SNVA401G – May 2009 – Revised May 2013 Submit Documentation Feedback AN-1978 LM3445 120VAC Small Evaluation Board Copyright © 2009–2013, Texas Instruments Incorporated 3 Pin-Out 4 www.ti.com Pin-Out ASNS 1 10 BLDR FLTR1 2 9 VCC DIM 3 8 GATE COFF 4 7 ISNS FLTR2 5 6 GND Figure 3. 10-Pin VSSOP Table 1. Pin Description 10 Pin VSSOP Pin # Name Description 1 ASNS PWM output of the triac dim decoder circuit. Outputs a 0 to 4V PWM signal with a duty cycle proportional to the triac dimmer on-time. 2 FLTR1 First filter input. The 120Hz PWM signal from ASNS is filtered to a DC signal and compared to a 1 to 3V, 5.85 kHz ramp to generate a higher frequency PWM signal with a duty cycle proportional to the triac dimmer firing angle. Pull above 4.9V (typical) to tri-state DIM. 3 DIM 4 COFF OFF time setting pin. A user set current and capacitor connected from the output to this pin sets the constant OFF time of the switching controller. 5 FLTR2 Second filter input. A capacitor tied to this pin filters the PWM dimming signal to supply a DC voltage to control the LED current. Could also be used as an analog dimming input. 6 GND Circuit ground connection. 7 ISNS LED current sense pin. Connect a resistor from main switching MOSFET source, ISNS to GND to set the maximum LED current. 8 GATE Power MOSFET driver pin. This output provides the gate drive for the power switching MOSFET of the buck controller. 9 VCC 10 BLDR Input/output dual function dim pin. This pin can be driven with an external PWM signal to dim the LEDs. It may also be used as an output signal and connected to the DIM pin of other LM3445 or LED drivers to dim multiple LED circuits simultaneously. Input voltage pin. This pin provides the power for the internal control circuitry and gate driver. Bleeder pin. Provides the input signal to the angle detect circuitry as well as a current path through a switched 230Ω resistor to ensure proper firing of the triac dimmer. 95.0 12 series connected LEDs @ 350 mA EFFICIENCY (%) 90.0 85.0 8 series connected LEDs @ 350 mA 80.0 75.0 80 90 100 110 120 130 140 LINE VOLTAGE (VAC ) Figure 4. LM3445 Efficiency vs Input Voltage 8 and 12 Series connected LEDs @ 350 mA 4 AN-1978 LM3445 120VAC Small Evaluation Board Copyright © 2009–2013, Texas Instruments Incorporated SNVA401G – May 2009 – Revised May 2013 Submit Documentation Feedback LM3445 Evaluation Board Schematic www.ti.com 5 LM3445 Evaluation Board Schematic VBUCK V+ L1 D2 C4 C5 + C6 D7 R12 LED+ D6 TP5 TP3 TP9 C12 VVF + V+ D5 TP12 R13 C10 C13 R14 J2 R3 Q1 TP4 TP8 D8 D3 Q5 BR1 D1 R4 L3 LM3445 U1 RT1 1 ASNS TP1 TP2 TP6 TP7 BLDR 10 R15 VCC 2 C14 J1 FLTR1 VCC 9 ICOLL R20 DIM 3 TP10 L2 BLDR R1 F1 C7 C8 R2 C1 LEDTP13 DIM GATE Q7 8 TP11 TRIAC DIMMER 4 COFF ISNS 7 5 FLTR2 GND 6 VAC R22 R21 C15 Linear RHOLD Insertion Circuit Valley fill triac holding current circuit VCC Forward phase holding current VCC Triac edge detect Reverse phase holding current BLDR VCC BLDR D4B D4A R10 R18 R8 TP5 C9 R5 C3 R17 Q8 VVF DIM Q6 R9 Q4 R16 C16 C11 Q2 R6 R11 R19 C17 V+ R23 Q3 R7 C2 Figure 5. Evaluation Board Schematic SNVA401G – May 2009 – Revised May 2013 Submit Documentation Feedback AN-1978 LM3445 120VAC Small Evaluation Board Copyright © 2009–2013, Texas Instruments Incorporated 5 Bill of Materials LM3445 Evaluation Board 6 www.ti.com Bill of Materials LM3445 Evaluation Board Table 2. Bill of Materials LM3445 Evaluation Board 6 REF DES Description MFG MFG Part Number U1 IC DRIVER LED W/TRIAC DIM 10VSSOP Texas Instruments LM3445 BR1 Bridge Rectifier Vr = 400V, Io = 0.8A, Vf = 1V Diodes Inc. HD04-T C1 Ceramic .10uF 250V X7R 1210 Taiyo Yuden QMK325B7104KN-T C2 Ceramic, 0.01uF, X7R, 25V, 10% MuRata GRM188R71E103KA01D C3 Ceramic, 1000pF 500V X7R 1206 Kemet C1206C102KCRACTU C4, C5, C12 .01uF KEMIT C1808C103KDRACTU C6, C10 CAP 33uF 100V ELECT NHG RADIAL Panasonic-ECG ECA-2AHG330 C7, C8 22uF, Ceramic, X5R, 25V, 10% MuRata GRM32ER61E226KE15L C9 4.7uF C3216X7R1E475K C11 No Load C13 Ceramic, 1.0 uF 100V X7R 1206 Murata GRM31CR72A105KA01 C14 Ceramic, X7R, 16V, 10% MuRata GRM188R71C474KA88D C15 Ceramic, 0.1uF, X7R, 16V, 10% MuRata GRM188R71C104KA01D C16 Ceramic, 0.22uF, X7R, 16V, 10% Murata GRM188R71E224KA88D C17 Ceramic, 330pF 100V C0G 0603 Murata GCM1885C2A331JA16D D1 DIODE ZENER 225MW 15V SOT23 ON Semiconductor BZX84C15LT1G D2, D3, D5, D6, D7 DIODE FAST REC 200V 1A Rohm Semiconductor RF071M2STR D4 DIODE SWITCH SS DUAL 70V SOT323 Fairchild BAV99WT1G D8 DIODE SUPER FAST 200V 1A SMB Diodes Inc MURS120-13-F F1 FUSE 1A 125V FAST Cooper/Bussman 6125FA1A J1, J2 Conn, Term Block 2POS Phoenix Contact 1715721 L1 INDUCTOR 1000UH .27A SMD SHIELD Murata Power sol 46105C L2 10mH, FERRITE CHIP POWER 160 OHM Steward HI1206T161R-10 MSS1260-105 L3 1mH, Shielded Drum Core, Coilcraft Inc. Q1 MOSFET N-CHAN 250V 4.4A DPAK Fairchild FDD6N25 Q2, Q3 TRANS NPN 350MW 40V SMD SOT23 Diodes Inc MMBT4401-7-F Q4 MOSFET P-CH 50V 130MA SOT-323 Diodes Inc BSS84W-7-F Q5 TRANS HIVOLT PNP AMP SOT-23 Fairchild MMBTA92 Q6 MOSFET N-CHANNEL 100V SOT323 Diodes Inc BSS123W-7-F Q7 MOSFET N-CH 200V POWERPAK 8-SOIC Vishay/Siliconix Si7464DP Q8 TRANS PNP LP 100MA 30V SOT23 ON Semiconductor BC858CLT1G R1 330ohm 2512 5% Resistor Vishay/Dale CRCW2512330RJNEG R2 4.75M, 0805, 1%, 0.125W Vishay-Dale CRCW08054M75FKEA R3 1%, 0.25W Vishay-Dale CRCW1206332kFKEA R4 (No Load) 0805 R5, R16 RES 49.9K OHM, 0.1W, 1% 0603 Vishay-Dale CRCW060349k9FKEA R6 RES 100K OHM, 0.25W1%, 1206 Vishay-Dale CRCW1206100kFKEA R7 RES 7.50K OHM, 0.1W, 1% 0603 Vishay-Dale CRCW06037k50FKEA R8 RES 10.0K OHM, 0.1W, 1% 0603 Vishay-Dale CRCW060310k0FKEA R9 RES 100 OHM, 0.25W1%, 1206 Vishay-Dale CRCW1206100RFKEA R10 RES 124 OHM, 0.25W1%, 1206 Vishay-Dale CRCW1206124RFKEA R11 RES 200K OHM, 0.125W, 1%, 0805 Vishay-Dale CRCW0805200kFKEA R12, R13 RES 1.0M OHM, 0.125W, 1%, 0805 Vishay-Dale CRCW08051M00FKEA R14 RES 576K OHM, 1/10W 1% 0603 Vishay-Dale CRCW0603576kFKEA R15 RES 280K OHM, 1/10W 1% 0603 Vishay-Dale CRCW0603280kFKEA AN-1978 LM3445 120VAC Small Evaluation Board Copyright © 2009–2013, Texas Instruments Incorporated SNVA401G – May 2009 – Revised May 2013 Submit Documentation Feedback PCB Layout www.ti.com Table 2. Bill of Materials LM3445 Evaluation Board (continued) 7 REF DES Description R17 (No Load) 0603 MFG MFG Part Number R18 RES 301 OHM, 0.25W1%, 1206 Vishay-Dale CRCW1206301RFKEA R19 RES 49.9 OHM, 0.125W, 1%, 0805 Vishay-Dale CRCW080549R9FKEA R20 RES 4.99 OHM 1/8W 1% 0805 Vishay-Dale CRCW08054R99FKEA R21 RES 12.1 OHM, 0.25W1%, 1206 Vishay-Dale CRCW120612R1FKEA R22 RES 1.8 OHM 1/3W 5% 1210 Vishay-Dale CRCW12101R80JNEA R23 RES 499 OHM, 0.25W1%, 1206 Vishay-Dale CRCW1206499RFKEA RT1 CURRENT LIM INRUSH 60OHM 20% Canterm MF72-060D5 TP10-TP13 Terminal, Turret, TH, Double Keystone Electronics 1503-2 PCB Layout Figure 6. Top Layer SNVA401G – May 2009 – Revised May 2013 Submit Documentation Feedback AN-1978 LM3445 120VAC Small Evaluation Board Copyright © 2009–2013, Texas Instruments Incorporated 7 PCB Layout www.ti.com Figure 7. Bottom Layer WARNING The LM3445 evaluation boards have no isolation or any type of protection from shock. Caution must be taken when handling evaluation board. Avoid touching evaluation board, and removing any cables while evaluation board is operating. Isolating the evaluation board rather than the oscilloscope is highly recommended. 8 AN-1978 LM3445 120VAC Small Evaluation Board Copyright © 2009–2013, Texas Instruments Incorporated SNVA401G – May 2009 – Revised May 2013 Submit Documentation Feedback 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. 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