LM3433EVALKIT

User's Guide SNVA295C – January 2008 – Revised May 2013 AN-1736 LM3433 HB LED Driver Evaluation Kit 1 Introduction The LM3433 is an adaptive constant on-time DC/DC buck constant current controller designed to drive a high brightness LEDs (HB LED) at high forward currents. It is a true current source that provides a constant current with constant ripple current regardless of the LED forward voltage drop. The board can accept an input voltage ranging from -9V to -14V w.r.t. GND. The output configuration allows the anodes of multiple LEDs to be tied directly to the ground referenced chassis for maximum heat sink efficacy when a negative input voltage is used. 2 LM3433 Board Description The evaluation board is designed to provide a constant current in the range of 2A to 9A. With some modification the board is capable of up to 20A. The LM3433 requires two input voltages for operation. A positive voltage with respect to GND is required for the bias and control circuitry and a negative voltage with respect to GND is required for the main power input. This allows for the capability of using common anode LEDs so that the anodes can be tied to the ground referenced chassis. The evaluation board only requires one input voltage of -12V with respect to GND. The positive voltage is supplied by the LM5002 circuit. The LM5002 circuit also provides a UVLO function to remove the possibility of the LM3433 from drawing high currents low input voltages during startup. Initially the output current is set at the minimum of approximately 2A with the POT P1 fully counter-clockwise. To set the desired current level a short may be connected between LED+ and LED-, then use a current probe and turn the POT clockwise until the desired current is reached. A PWM dimming FET is included on-board for testing when the LED can be connected directly next to the board. A shutdown post on J2, ENA, is included so that startup and shutdown functions can be tested using an external voltage. Included in the kit is a load board the emulates a high current LED and an LED adapter board used to place a dimming FET close to a remote LED. 3 LED Adapter Board Description The LED adapter board is designed to allow placement of a dimming FET as close to an LED as possible. The high currents supplied by the LM3433 require that the FET be very close the LED to reduce the inductance between the two current paths. Placing the FET far from the LED could result in high voltage spikes due to the di/dt through the inductance between the FET and the LED. If the LED cannot be placed directly next to the LM3433 evaluation board then remove the dimming FET(s) from the LM3433 board (Q5 and Q6) and use this board. The LED adapter board connects to the LM3433 board with the supplied 26 pin ribbon cable. 4 Load Board Description The load board is designed to emulate an LED load. This board provides the ability to test the LM3433 without the possibility of accidentally destroying high current LEDs. It connects to the LM3433 evaluation board with the supplied 26 pin ribbon cable. The load board has an adjustable voltage controlled with the POT R5 and it includes three small LEDs that light up when the forward voltage of each is reached. This allows for adjusting the voltage to the level desired corresponding to a red, green, or blue LED. Test points are included so that current can be measured across a low value resistor both before and after the included dimming FET. All trademarks are the property of their respective owners. SNVA295C – January 2008 – Revised May 2013 Submit Documentation Feedback AN-1736 LM3433 HB LED Driver Evaluation Kit Copyright © 2008–2013, Texas Instruments Incorporated 1 Setting the LED Current www.ti.com These resistors can also be removed and replaced with a short loop of wire if using a current probe is desired. If the PWM dimming function is used with the load board the dimming FET(s) (Q5 and Q6) should be removed from the LM3433 evaluation board. The load board is designed for approximately 8A maximum. It includes thermal protection and will shut down if it gets too hot. The thermal protection may trip during normal testing especially if higher voltages are used. If the thermal protection trips let the board cool down and then resume testing. 5 Setting the LED Current The LM3433 evaluation board is designed so that the LED current can be set in multiple ways. There is a shunt on J2 initially connecting the ADJ pin to the POT allowing the current to be adjusted using the POT P1. This POT will apply a voltage to the ADJ pin between 0.3V and 1.5V w.r.t. GND to adjust the voltage across the sense resistor (RSENSE) R15. The shunt may also be removed and an external voltage positive w.r.t. GND can then be applied to the ADJ test point on the board. A 10mΩ resistor comes mounted on the board so using the VSENSE vs. VADJ graph in the Typical Performance Characteristics section the current can be set using Equation 1: ILED = VSENSE/RSENSE (1) Alternatively the shunt can be removed and connect the ADJ test point can be connected to the VINX test point to fix VSENSE at 60mV. 6 PWM Dimming The LM3433 is capable if high speed PWM dimming in excess of 40kHz. Dimming is accomplished by shorting across the LED with a FET. A dimming FET is included on the evaluation board for testing LEDs placed close to the board and also on the load board and adapter board for remote loads. The FET on the evaluation board should be removed if using dimming with the load board or adapter board. To use the dimming function apply square wave to the PWM test point on the board that has a positive voltage w.r.t. GND. When this pin is pulled high the dimming FET is enabled and the LED turns off. When it is pulled low the dimming FET is turned off and the LED turns on. A scope plot of PWM dimming is included in the Typical Performance Characteristics section showing 30kHz dimming at 50% duty cycle. 2 AN-1736 LM3433 HB LED Driver Evaluation Kit SNVA295C – January 2008 – Revised May 2013 Submit Documentation Feedback Copyright © 2008–2013, Texas Instruments Incorporated PWM Dimming www.ti.com Figure 1. LM3433 Evaluation Board Schematic SNVA295C – January 2008 – Revised May 2013 Submit Documentation Feedback AN-1736 LM3433 HB LED Driver Evaluation Kit Copyright © 2008–2013, Texas Instruments Incorporated 3 PWM Dimming www.ti.com Table 1. Bill of Materials (BOM) 1 (2A to 9A) Qty ID Part Number Type Size 1 U1 LM3433 LED Driver WQFN-24 TI 1 U2 LM5002 Boost Regulator SOIC-8 TI 1 C1 C0805C331J5GACTU Capacitor 0805 330pF, 50V Kemet 1 C2 GRM31CR61C106KC3 1L Capacitor 1206 10µF, 16V Murata Vendor 1 C3 16SA150M Capacitor MULTICAP 150µF, 16V Sanyo 2 C4, C5 GRM32ER61C226KE2 0L Capacitor 1210 22µF, 16V Murata 1 C6 GRM32ER61C476ME1 5L Capacitor 1210 47µF, 16V Murata 1 C7 C0805C104J5RACTU Capacitor 0805 0.1µF, 50V Kemet 2 C8, C13 HMK212BJ103KG-T Capacitor 0805 10nF, 100V Taiyo Yuden C9 OPEN 2 C10, C11 GRM21BR61C475KA Capacitor 0805 4.7µF, 16V Murata 1 C12 0805YD105KAT2A Capacitor 0805 1µF, 16V AVX 1 C14 B37941K9474K60 Capacitor 0805 0.47µF, 16V EPCOS Inc . 1 C15 GRM21BF51E225ZA01 L Capacitor 0805 2.2µF, 25V Murata C17 OPEN 1 C18 08055C104JAT2A Capacitor 0805 0.1µF, 50V AVX 2 D1, D2 MA2YD2600L Diode SOD-123 60V, 800mA Panasonic 1 D3 MBRS240LT3 Diode SMB 40V, 2A ON Semiconductor 0805 0805 D4 OPEN J1, J2 OPEN 1 J9 TFML-110-02-S-D Connector 1 L1 LPS3008-104ML Inductor 3008 100µH, 150mA Coilcraft 1 L2 GA3252-AL Inductor GA3252-AL 12µH, 14A Coilcraft L3, L5 OPEN 2 L4, L6 MPZ2012S300A Ferrite Bead 0805 30Ω @ 100MHz TDK 1 L7 MPZ2012S101A Ferrite Bead 0805 100Ω @ 100MHz TDK 1 P1 3352T-1-103LF Potentiometer BOURNS2 10kΩ Bourns 1 P10 3429-6002 Connector HDR13x2 13X2 Pin Header 3M SMB TFM-110-02-X-D-LC Samtec 0805 Q1, Q3, Q5 OPEN 2 Q4, Q6 Si7386DP FET PowerPAK 30V, 9.5mΩ VishaySiliconix 1 Q2 NTMFS4841NH FET PowerPAK 30V, 11mΩ ON Semiconductor Dual PNP SOT363_N 1 4 Parameters PowerPAK Q7 BC856S Q8, Q9 OPEN 1 R1 ERJ-6ENF2942V Resistor 0805 29.4kΩ Panasonic 1 R2 ERJ-6ENF2491V Resistor 0805 2.49kΩ Panasonic 3 R3, R30, R31 ERJ-6ENF1002V Resistor 0805 10kΩ Panasonic 1 R4 ERJ-6GEYJ393V Resistor 0805 39kΩ Panasonic 1 R5 ERJ-6GEYJ101V Resistor 0805 100Ω Panasonic 2 R7, R14 ERJ-6GEY0R00V Resistor 0805 0Ω Panasonic 1 R8 ERJ-6ENF2002V Resistor 0805 20kΩ Panasonic 1 R10 ERJ-6ENF4991V Resistor 0805 4.99kΩ Panasonic 2 R11, R12 ERJ-6ENF6192V Resistor 0805 61.9kΩ Panasonic 1 R13 ERJ-6GEYJ103V Resistor 0805 10kΩ Panasonic AN-1736 LM3433 HB LED Driver Evaluation Kit Phillips SNVA295C – January 2008 – Revised May 2013 Submit Documentation Feedback Copyright © 2008–2013, Texas Instruments Incorporated PWM Dimming www.ti.com Table 1. Bill of Materials (BOM) 1 (2A to 9A) (continued) Qty ID Part Number Type Size Parameters Vendor 1 R15 WSL2512R0100FEA Resistor CR6332-2512 0.01Ω Vishay R16, R18, R19 OPEN 3 R17, R20, R21 ERJ-6GEYJ2R7V Resistor 0805 0805 2.7Ω Panasonic 1 R22 ERJ-6GEYJ100V Resistor 0805 10Ω Panasonic 1 R25 ERJ-6ENF7502V Resistor 0805 75kΩ Panasonic R26 OPEN 4 -12V, GND, LED+, LED- 1502-2 Test Post TP 1502 0.109" Keystone 3 ADJ, PWM, VINX 1593-2 Test Post TP 1593 0.084" Keystone Parameters Vendor 0805 Table 2. Bill of Materials (BOM) 2(4A to 20A) Qty ID Part Number Type Size 1 U1 1 U2 LM3433 LED Driver WQFN-24 LM5002 Boost Regulator SOIC-8 1 C1 C0805C331J5GACTU Capacitor 0805 330pF, 50V Kemet 1 C2 GRM31CR61C106KC31L Capacitor 1206 10µF, 16V Murata TI TI 1 C3 16SA150M Capacitor MULTICAP 150µF, 16V Sanyo 2 C4, C5 GRM32ER61C226KE20L Capacitor 1210 22µF, 16V Murata 1 C6 GRM32ER61C476ME15L Capacitor 1210 47µF, 16V Murata 1 C7 C0805C104J5RACTU Capacitor 0805 0.1µF, 50V Kemet 2 C8, C13 HMK212BJ103KG-T Capacitor 0805 10nF, 100V Taiyo Yuden C9 OPEN 2 C10, C11 GRM21BR61C475KA Capacitor 0805 4.7µF, 16V Murata 1 C12 0805YD105KAT2A Capacitor 0805 1µF, 16V AVX 1 C14 B37941K9474K60 Capacitor 0805 0.47µF, 16V EPCOS Inc . 1 C15 GRM21BF51E225ZA01L Capacitor 0805 2.2µF, 25V Murata 0805 C17 OPEN 1 C18 08055C104JAT2A Capacitor 0805 0805 0.1µF, 50V AVX 2 D1, D2 MA2YD2600L Diode SOD-123 60V, 800mA Panasonic 1 D3 MBRS240LT3 Diode SMB 40V, 2A ON Semiconductor D4 OPEN SMB J1, J2 OPEN 1 J9 TFML-110-02-S-D Connector TFM-110-02-X-D-LC 1 L1 LPS3008-104ML Inductor 3008 100µH, 150mA Coilcraft 1 L2 GA3252-AL Inductor GA3252-AL 12µH, 14A Coilcraft 4 L3, L4, L5, L6 MPZ2012S300A Ferrite Bead 0805 30Ω @ 100MHz TDK 1 L7 MPZ2012S101A Ferrite Bead 0805 100Ω @ 100MHz TDK 1 P1 3352T-1-103LF Potentiometer BOURNS2 10kΩ Bourns 1 P10 3429-6002 Connector HDR13x2 13X2 Pin Header 3M 4 Q3, Q4, Q5, Q6 Si7386DP FET PowerPAK 30V, 9.5mΩ VishaySiliconix 2 Q1, Q2 NTMFS4841NH FET PowerPAK 30V, 11mΩ ON Semiconductor 1 Q7 BC856S Dual PNP SOT363_N Phillips 1 Q8 ZXTN25040DFHTA NPN SOT-23B Zetex Inc. SNVA295C – January 2008 – Revised May 2013 Submit Documentation Feedback Samtec AN-1736 LM3433 HB LED Driver Evaluation Kit Copyright © 2008–2013, Texas Instruments Incorporated 5 PWM Dimming www.ti.com Table 2. Bill of Materials (BOM) 2(4A to 20A) (continued) 6 Qty ID Part Number Type Size 1 Q9 ZXTP25040DFHTA PNP SOT-23B Parameters Vendor 1 R1 ERJ-6ENF2942V Resistor 0805 29.4kΩ Panasonic 1 R2 ERJ-6ENF2491V Resistor 0805 2.49kΩ Panasonic 3 R3, R30, R31 ERJ-6ENF1002V Resistor 0805 10kΩ Panasonic 1 R4 ERJ-6GEYJ393V Resistor 0805 39kΩ Panasonic 1 R5 ERJ-6GEYJ101V Resistor 0805 100Ω Panasonic R7 OPEN 2 R14 ERJ-6GEY0R00V Resistor 0805 0Ω Panasonic 1 R8 ERJ-6ENF2002V Resistor 0805 20kΩ Panasonic 1 R10 ERJ-6ENF4991V Resistor 0805 4.99kΩ Panasonic 2 R11, R12 ERJ-6ENF6192V Resistor 0805 61.9kΩ Panasonic 1 R13 ERJ-6GEYJ103V Resistor 0805 10kΩ Panasonic 1 R15 WSL25125L000FEA Resistor CR6332-2512 0.005Ω Vishay 6 R16, R17, R18, R19, R20, R21 ERJ-6GEYJ2R7V Resistor 0805 2.7Ω Panasonic 1 R22 ERJ-6GEYJ100V Resistor 0805 10Ω Panasonic 1 R25 ERJ-6ENF7502V Resistor 0805 75kΩ Panasonic R26 OPEN 4 -12V, GND, LED+, LED- 1502-2 Test Post TP 1502 0.109" Keystone 3 ADJ, PWM, VINX 1593-2 Test Post TP 1593 0.084" Keystone Zetex Inc. 0805 AN-1736 LM3433 HB LED Driver Evaluation Kit SNVA295C – January 2008 – Revised May 2013 Submit Documentation Feedback Copyright © 2008–2013, Texas Instruments Incorporated PWM Dimming www.ti.com Figure 2. Load Board Schematic SNVA295C – January 2008 – Revised May 2013 Submit Documentation Feedback AN-1736 LM3433 HB LED Driver Evaluation Kit Copyright © 2008–2013, Texas Instruments Incorporated 7 PWM Dimming www.ti.com Table 3. Load Board BOM ID 8 Part Number Type Size Parameters Qty Vendor 1 Lumex 1 ON Semiconductor Lumex C1, C2 OPEN D1 SSL-LX5063ID Red LED T 1 3/4 0805 D2 BZX84C15LT1 Zener Diode SOT-23 D3 SSL-LX5063GD Green LED T 1 3/4 1 D4 SSL-LX5093USBD Blue LED T 1 3/4 1 Lumex H1 7-339-4PP-BA Heatsink TO-220 Bolt On 1 IREC-CTS J1 S9001 Connector 1X2 Header 1X2 Pin Header 1 Sullins Electronics Corp . 225mW, 15V P1 3429-6002 Connector HDR13x2 13X2 Pin Header 1 3M Q1 Si4884DY FET SO-8 30V, 16mΩ 1 VishaySiliconix Q2 FZT649 NPN SOT-223 1 Zetex Inc. Q3 D44H NPN TO-220 60V, 10A 1 ON Semiconductor R1, R2 WSL2010R0100FEA18 Resistor 2010 0.01Ω 2 Vishay R3 ERJ-6ENF20R0V Resistor 0805 20Ω 1 Panasonic R4 9C08052A1004JLHFT Resistor 0805 1MΩ 1 Yageo Corporation R5 PV36X102C01B00 Potentiometer 0805 250Ω 1 Murata R6, R7 ERJ-6ENF1000V Resistor 0805 100Ω 2 Panasonic R8 MCR10EZHF4700 Resistor 0805 470Ω 1 Rohm R9 ERJ-6GEYJ391V Resistor 0805 390Ω 1 Panasonic R10 ERJ-6GEYJ331V Resistor 0805 330Ω 1 Panasonic SW1 F1107015ACFA06E TO-220 w/leads 70deg. C.N.O. 1 Canthem +, -, ANODE, +, -, CATHODE, GATE 1502-2 TP 1502 0.109" 7 Keystone AN-1736 LM3433 HB LED Driver Evaluation Kit Test Post SNVA295C – January 2008 – Revised May 2013 Submit Documentation Feedback Copyright © 2008–2013, Texas Instruments Incorporated PWM Dimming www.ti.com Figure 3. LED DIM Adapter Board Schematic Table 4. Adapter Board Bill of Materials (BOM) Qty ID Part Number R1 OPEN Parameters Vendor 1 D1 BZX84C15LT1 Zener Diode SOT-23 225mW, 15V ON Semiconductor 1 P1 3429-6002 Connector HDR13x2 13X2 Pin Header 3M 1 Q1 Si4884DY FET SO-8 30V, 16mΩ VishaySiliconix 7 ANODE, CATHODE, GATE 1502-2 Test Post TP 1502 0.109" Keystone SNVA295C – January 2008 – Revised May 2013 Submit Documentation Feedback Type Size 0805 AN-1736 LM3433 HB LED Driver Evaluation Kit Copyright © 2008–2013, Texas Instruments Incorporated 9 Typical Performance Characteristics 7 www.ti.com Typical Performance Characteristics 97 96 2A 4A 6A 8A 96 94 94 EFFICIENCY (%) EFFICIENCY (%) 95 93 92 91 90 2A 4A 6A 8A 89 88 87 1 2 3 4 5 6 92 90 88 86 84 7 1 2 3 VLED (V) 6 7 Figure 5. Efficiency vs. LED Forward Voltage (VCGND - VEE = 12V) 100 96 2A 4A 6A 8A 94 90 80 70 VSENSE (mV) 92 EFFICIENCY (%) 5 VLED (V) Figure 4. Efficiency vs. LED Forward Voltage (VCGND - VEE = 9V) 90 88 86 60 50 40 30 84 20 82 10 80 1 2 3 4 5 6 7 0 0.2 0.4 Figure 6. Efficiency vs. LED Forward Voltage (VCGND - VEE = 14V) AN-1736 LM3433 HB LED Driver Evaluation Kit 0.6 0.8 1 1.2 1.4 1.6 ADJ VOLTAGE (V) VLED (V) 10 4 Figure 7. VSENSE vs. VADJ SNVA295C – January 2008 – Revised May 2013 Submit Documentation Feedback Copyright © 2008–2013, Texas Instruments Incorporated Typical Performance Characteristics www.ti.com ILED = 6A nominal, VIN = 3.3V, VEE = -12V Top trace: DIM input, 2V/div, DC Bottom trace: ILED, 2A/div, DC T = 10µs/div Figure 8. 30kHz PWM Dimming Waveform Showing Inductor Ripple Current SNVA295C – January 2008 – Revised May 2013 Submit Documentation Feedback AN-1736 LM3433 HB LED Driver Evaluation Kit Copyright © 2008–2013, Texas Instruments Incorporated 11 Layout 8 www.ti.com Layout Figure 9. Top Layer and Top Overlay 12 AN-1736 LM3433 HB LED Driver Evaluation Kit SNVA295C – January 2008 – Revised May 2013 Submit Documentation Feedback Copyright © 2008–2013, Texas Instruments Incorporated Layout www.ti.com Figure 10. Upper Middle Layer SNVA295C – January 2008 – Revised May 2013 Submit Documentation Feedback AN-1736 LM3433 HB LED Driver Evaluation Kit Copyright © 2008–2013, Texas Instruments Incorporated 13 Layout www.ti.com Figure 11. Lower Middle Layer 14 AN-1736 LM3433 HB LED Driver Evaluation Kit SNVA295C – January 2008 – Revised May 2013 Submit Documentation Feedback Copyright © 2008–2013, Texas Instruments Incorporated Layout www.ti.com Figure 12. Bottom Layer and Bottom Overlay SNVA295C – January 2008 – Revised May 2013 Submit Documentation Feedback AN-1736 LM3433 HB LED Driver Evaluation Kit Copyright © 2008–2013, Texas Instruments Incorporated 15 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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