LM3410XSDLEDEV/NOPB

User's Guide SNVA314B – January 2008 – Revised May 2013 AN-1774 LM3410X LED Driver 6-Pin LLP Demo Board 1 Introduction The demo board included in this shipment converts 2.7V to 5.5V input, and illuminates four 50mA LED’s in series using the LM3410X 1.6MHz LED driver switching converter. This is a 2-layer board using the bottom layer as a Ground plane. A bill of materials (see Section 2) describes the parts used on this demo 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 demo board as shipped with the demo board schematic below. Operatiing Conditions VIN = 2.7V to 5.5V VO ≊ VF x 4 + VFB ≊ 3.6V x 4 + 0.198V ≊ 14.4V IO = 50mA L1 D1 VIN LM3410 C1 R2 DIMM 1 6 2 5 3 4 LEDs C2 R1 Figure 1. LM3410X 6-Pin LLP Schematic All trademarks are the property of their respective owners. SNVA314B – January 2008 – Revised May 2013 Submit Documentation Feedback AN-1774 LM3410X LED Driver 6-Pin LLP Demo Board Copyright © 2008–2013, Texas Instruments Incorporated 1 Bill of Materials LM3410X www.ti.com PGND 1 6 SW VIN 2 5 AGND DIM 3 4 FB Figure 2. Pinout Table 1. Pin Descriptions - 6 Pin LLP 2 2 Pin Name Function 1 PGND Power ground pin. Place PGND and output capacitor GND close together. 2 VIN Supply voltage for power stage, and input supply voltage. 3 DIM Dimming & shutdown control input. Logic high enables operation. Duty Cycle from 0 to 100%. Do not allow this pin to float or be greater than VIN + 0.3V. 4 FB Feedback pin. Connect FB to external resistor divider to set output voltage. 5 AGND 6 SW DAP GND Signal ground pin. Place the bottom resistor of the feedback network as close as possible to this pin & pin 4. Output switch. Connect to the inductor, output diode. Signal & Power ground. Connect to pin 1 & pin 5 on top layer. Place 4-6 vias from DAP to bottom layer GND plane. Bill of Materials LM3410X Part ID Part Value Manufacturer Part Number U1 2.8A ISW LED Driver NSC LM3410XSD C1, Input Cap 10µF, 6.3V, X5R TDK C2012X5R0J106M C2 Output Cap 2.2µF, 25V, X5R TDK C2012X5R1E225M D1, Catch Diode 0.4Vf Schottky 500mA, 30VR Diodes Inc MBR0530 L1 10µH 1.5A Coilcraft DO1608C-103 R1 4.02Ω, 1% Vishay CRCW08054R02F R2 100kΩ, 1% Vishay CRCW06031003F LED’s SMD-1206, 50mA, Vf ≊ 3 .6V Lite-On LTW-150k AN-1774 LM3410X LED Driver 6-Pin LLP Demo Board SNVA314B – January 2008 – Revised May 2013 Submit Documentation Feedback Copyright © 2008–2013, Texas Instruments Incorporated Performance Characteristics www.ti.com 3 Performance Characteristics Figure 3. LM3410X Efficiency vs Input Voltage Series LEDs @ 50mA 4 Figure 4. LM3410X Average LED Current vs DutyCycle & Dimming Frequency PCB Layout Figure 5. Demonstration Board Top Layer SNVA314B – January 2008 – Revised May 2013 Submit Documentation Feedback AN-1774 LM3410X LED Driver 6-Pin LLP Demo Board Copyright © 2008–2013, Texas Instruments Incorporated 3 16V > VPWR > 5.5V Application Circuit www.ti.com Figure 6. Demonstration Board Bottom Layer 5 16V > VPWR > 5.5V Application Circuit The demonstration board provided can easily be modified to allow the user to derive the power from an input supply that is larger than 5.5V. In Figure 7 two separate supplies are needed. VIN must be between 2.7V minimum to 5.5V maximum, but VPWR can be as great as 16V. L1 D1 VPWR C1 R2 LM3410 R3 DIMM D2 1 6 2 5 3 4 LEDs C2 C3 R1 Figure 7. Circuit Needs Two Separate Supplies The circuit shown in Figure 8 allows for a single supply to be used with a simple zenner diode regulation circuit to provide the LM3410 with a housekeeping and driver voltage that is below 5.5V. 4 AN-1774 LM3410X LED Driver 6-Pin LLP Demo Board SNVA314B – January 2008 – Revised May 2013 Submit Documentation Feedback Copyright © 2008–2013, Texas Instruments Incorporated 16V > VPWR > 5.5V Application Circuit www.ti.com L1 D1 VPWR C1 LM3410 VIN R2 C3 1 6 2 5 3 4 LEDs C2 DIMM R1 Figure 8. Circuit Allows Single Supply The LM3410 VIN supply will draw approximately 7 mA while it is switching. Zenner diode should have a breakdown voltage lower than 5V, and size R3 to allow for 7 mA of current draw. Table 2. List of Components Part ID Part Value Manufacturer Part Number U1 2.8A ISW LED Driver NSC LM3410XSD C1 VPWR Input Cap 10µF, 6.3V, X5R TDK C1608X5R0J106K C2 Output Cap 1µF, 25V, X5R TDK C2012X5R1E105K C3 VIN Input Cap 0.1µF,16V, X5R TDK C1005X5R1C104K D1, Catch Diode 0.43Vf, Schotky, 0.5A, 30VR Diodes Inc B0530W L1 6.8µH 2.7A Coilcraft MOS6020-682 R1 4.02Ω, 1% Vishay CRCW08054R02FRT1 R2 100kΩ, 1% Vishay CRCW08051003F R3 576Ω, 1% Vishay CRCW08055760F D2 3.3V Zener, SOT23 Diodes Inc BZX84C3V3 LEDs SMD-1206, 50mA, Vf ≊ 3 .6V SNVA314B – January 2008 – Revised May 2013 Submit Documentation Feedback AN-1774 LM3410X LED Driver 6-Pin LLP Demo Board Copyright © 2008–2013, Texas Instruments Incorporated 5 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. 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