Development Kit Manual DK-114N-1 and DK
Contents
1. gt LUMINUS LEADER IN BIG CHIP LEDS Development Kit Manual DK 114N 1 and DK 114N 3 Overview Big Chip LEDs from Luminus Devices have been designed from the ground up to enable a new class of illumination and projection systems Benefiting from a suite of innovations in chip technology packaging and thermal management Big Chip LEDs allow designers to achieve efficient light engine designs and deliver high brightness solutions The DK 114N series development kit is a comprehensive so lution designed specifically to support the development of single and three channel PT and CBT series Big Chip LEDs Each channel of the kit comprising of a high current driver an efficient thermal management solution and cables is capa ble of sourcing a drive current of 14 A and ensures that CBT and PT series LEDs are operated at up to 70 W for maximum brightness This plug and play solution can easily be connect ed to common laboratory equipment through standard con nectors and allows system designers to save weeks in their development cycles 1 960017 RevB 2011 Luminus Devices Inc All Rights Reserved DK 114N series Development Kit Manual Table of Contents lU 2 Development Kit Contents 2 2 1 Heat Sink and Driver Board 2 22 ET 3 2 3 TIM and Mounting Hardware 4 SEH 4 3 1 Device Mounting Instructions 5 EE aeae ae tet ee 6 DOPTA ON RE 6 ADDEN AI ences a nae cn oe mas2. a 12V DC input with respect to ground and can provide up to 14A to LEDs in either CW or pulsed mode PWM dimming is achieved with a 0 5 V signal from a function generator and frequencies up to 40 kHz are supported Figure 3 depicts the layout of the driver board along with the commonly used pins and readouts The signal pins are used to achieve external current control and provide PWM dimming the orientation of these pins is also shown starting with pin 1 GND on the left Appendix C lists the pin out for the signal pins Note The heat sink conducts power even though it is grounded 2 2 Cable Assembly Each development kit includes the following cables e Power supply to driver board cable e Driver board to LED cables e Signal cable e Thermistor cable 3 Luminus Devices Inc T 978 528 8000 e www luminus com 960017 RevB 2011 Luminus Devices Inc All Rights Reserved 1100 Technology Park Drive Billerica MA 01821 L LJ Vi DN LI DK 114N series Development Kit Manual LEADER IN BIG CHIP LEDS Figures 4 7 From left to right Power supply to driver board cable Signal cable Driver board to LED cable Thermistor cable Figure 6 depicts two types of driver board to LED cables the shorter cable with the 8 pin connector on the left used with LEDs such as PT 39 CBT 40 and PT 54 and the longer cable with the two spade connectors on the right used with LEDs such as the CBT 90 PT 120 and CBT 120 For optimum performance an
3. pin using the signal cable Figure 12 shows the relationship between the LED current and the external voltage ak uo LED Current A O 0 5 1 External Voltage V Figure 12 LED Current as a function of External Voltage 7 Luminus Devices Inc T 978 528 8000 e www luminus com 960017 RevB 2011 Luminus Devices Inc All Rights Reserved 1100 Technology Park Drive Billerica MA 01821 LEADER IN BIG CHIP LEDS Zz L LJ MI l NI UJ DK 114N series Development Kit Manual 4 To modulate the LEDs through PWM connect the 0 5 V pulsed output of a waveform generator across the PWM and GND pins on the signal cable with the PWM pin at a positive voltage with respect to GND 5 V represents Off and 0 V represents On The Analog ADJ and POT pins must be shorted this allows for the LED s peak current to be controlled via the on board POT Proper operation is best monitored by using a photo detector to observe the light output from the LED Note Exceeding 5 V on the PWM pin may cause permanent damage to the driver board 5 Coreboard temperature of the Big Chip LEDs is monitored using a Murata Manufacturing Co thermistor part number NCP15XH103J03RC When using the short 8 pin cable the on board thermistor is connected to test points THRM1 and THRM2 on the driver board Signal Pins 7 and 8 are also thermistor test points and are equivalent to THRM2 and THRM1 Figure 13 shows the relationship between the thermi
4. I f NI UJ DK 114N series Development Kit Manual LEADER IN BIG CHIP LEDS and thermal design can be used as a reference by system designers to this effect design files including schematics mechanical drawings and bill of materials are available upon request PT CBT and CST series LEDs are built in the common anode configuration To enable driving these LEDs the driver circuit based on National Semiconductor s LM3433 IC is configured in the grounded common anode topology refer Appendix B which enables anodes of multiple LEDs to be in electrical contact with each other without necessitating electrical isolation Further design support for the driver can be obtained at http www national com 2 1 Heat Sink and Driver Board The heat sink measuring only 40 mm x 40 mm x 40 mm is a high performance low cost compact air cooled aluminum extrusion and enables significant power dissipation to the ambient by virtue of its low thermal resistance 0 6 C W The bolt pattern on the front allows for easy mounting of all CBT and PT series modules SA n SES lt ep e GM D gt l e Sense Resistor Test studs Figure 2 Heat sink Figure 3 Driver board The driver board designed with National Semiconductor s LM3433 IC Figure 3 is mounted close to the heat sink allowing for minimal cable lengths lt 3 which help prevent current ringing when pulsing LEDs The driver board because of its grounded common anode topology requires
5. d to avoid ringing when pulsing the LEDs increasing the length of the driver board to LED cable is not recommended 2 3 Thermal Interface Material TIM and Mounting Hardware The development kit includes precut sheets of eGraf HiTherm 1205 a high performance thermal interface material and M2x5 M2 5x6 screws required for mounting the LEDs Figure 7 TIM sheets 3 User Instructions The following sections explain the set up and operation of the DK 114N 1 Development Kit Additional lab equipment such as a 12 V laboratory power supply an oscilloscope a waveform generator a multimeter and a photodetector are required to power and use the DK 114N 1 Table 1 lists a recommended model for the equipment and Appendix D provides an additional list of compatible power supplies The use of a table equipped with ESD protection is recommended 4 Luminus Devices Inc T 978 528 8000 e www luminus com 960017 RevB 2011 Luminus Devices Inc All Rights Reserved 1100 Technology Park Drive Billerica MA 01821 L UJ MI i Ni LI DK 114N series Development Kit Manual LEADER IN BIG CHIP LEDS Table 1 Additional Lab Equipment 12 V Lab Power Supply Lambda ZUP20 20 Oscilloscope Tektronix TDS 3024B Agilent 33220A Multimeter Fluke 187 Thorlabs PDA10A 3 1 Device Mounting Instructions Ineffective heat sinking may lead to premature LED degradation or failure The following steps explain how a device is mounted on the heat sink whi
6. ded in the kit The choice of the driver board to LED cables is based on the LED connector LEDs such as PT 39 PT 54 and CBT 40 with an eight pin connector require the shorter 3 cable while LEDs such as CBT 90 PT 120 and CBT 120 with the 2 pin soade connector require the longer cable Figure 10 illustrates the electrical connections to the driver board while both types of driver board to LED cables are shown for illustration only one is required Power supply to driver Signal cable board cable Driver board to LED cable Figure 10 Completed electrical connections on DK 114N 1 3 Use the jumper provided with the driver board to short signal pins 2 and 3 see Figure 3 and Appendix C These pins correspond to Analog ADJ and POT shorting them enables the on board potentiometer Alternatively the jumper can be removed and signal cable can be used to short the Analog ADJ and POT pins 4 Set the POT to the minimum current setting by rotating it fully counter clockwise The embedded arrow should point towards the 10 on the POT 5 The development kit is now ready to be powered on Turn on the power supply and increase the source voltage to 12 V with respect to ground The driver will draw about 1 2 A current CAUTION Do not set the power supply higher 12 V doing so may damage the driver 3 3 Operation The DK 114N 1 can be used to drive LEDs in continuous current controlled mode via the on board POT or through an external a
7. est efficiency select a power supply that closely matches the required power Table 4 Isolated AC DC power supplies 85 264 VAC 30W CUI Inc 47 400 Hz 12V 2 5A 3 7 x 2 x 0 85 Thru hole SMT FSK S30 12U 85 264 VAC 50 W Omron 47 63 Hz 12V 4 2A 5 x 3 34 x 1 57 DIN Rail S8SP 05005 90 264VAC Enclosed Chassis 50W Lambda Power 47 63Hz 12V 3A 3 62 x 1 46 x 6 26 mount SWS Series 90 264 VAC 5 24 x 2 39 x 60 W Globtek Inc 47 440Hz 12V 5A 1 62 External Desktop DPS50 90 264 VAC Enclosed Chassis 75W Lambda Power 47 63Hz 12V 6 3A 3 7 x 1 69 x 6 69 mount SWS Series 90 264 VAC Enclosed Chassis 100 W Lambda Power 47 63Hz 12V 8 5A 3 78 x 1 77 x 7 4 mount SWS Series 100 264 VAC 7 36 X 4 33 X FWP10012 100 W Elpac Power 47 63Hz 12V 8 3 2 32 External Desktop D8F NC 100 264 VAC 120W AULT Inc AC 47 63Hz 12V 10A 9 x2 9 x 2 Medical External SE 22RA12X 90 264 VAC 125w___ Power One Solutions 47 63147 12V 10 5A 5 x3 x 1 25 MBP125 1012 90 264 VAC Enclosed Chassis 150 W Lambda Power 47 63Hz 12V 12 5A 3 9 x2 X 7 8 mount SWS Series 10 Luminus Devices Inc T 978 528 8000 e www luminus com 960017 RevB 2011 Luminus Devices Inc All Rights Reserved 1100 Technology Park Drive Billerica MA 01821 a series Development Kit Manua E LUMINUS DK 114N Development Kit Manual LEADER IN BIG CHIP LEDS Appendix E Driver Specifications Table 5 Driver board specifications Inp
8. in direct contact with a common heat sink the common anode configuration causes poses a challenge to electrically addressing and isolating individual LEDs The driver board in the DK 114N 1 based on National Semiconductor s LM3433 IC addresses the challenge of connecting multiple common anode LEDs by utilizing a grounded common anode topology i e the anode is kept at ground and the cathode is at a negative potential thus enabling LEDs to be in contact directly with the heat sink A basic schematic using three grounded common anode LEDs is shown below in Figure 14 It is important to note that while the heat sink is at ground there is still power passing through it Chassis Ground O LED Anode LED Cathode D1 UI Chassis Ground P LED Anode LED Cathode D2 8 Chassis Ground A LED Anode LED Cathode D3 8 Figure 14 Grounded common anode configuration 9 Luminus Devices Inc T 978 528 8000 e www luminus com 960017 RevB 2011 Luminus Devices Inc All Rights Reserved 1100 Technology Park Drive Billerica MA 01821 LEADER IN BIG CHIP LEDS L LJ Vi DN LJ DK 114N series Development Kit Manual Appendix C Driver Board Pin out Analog ADJ GND Appendix D Isolated AC DC Power Supplies Table 3 lists a few isolated AC DC power supplies A power supply with isolated outputs is required to properly drive the common anode LEDs and failure to use an isolated power supply may damage the driver board For b
9. le ensuring good thermal contact between the copper core board and the heat sink 1 Use athermal interface sheet that is slightly larger than the core board Figure 7 Figure 8 PT 39 LED and an appropriate TIM sheet 2 The heat sink surface must be free of dust particles Place the thermal interface sheet on the heat sink with its pre drilled holes matching the holes on the heat sink 3 Place the device on the thermal interface sheet 4 Insert screws in the holes of the coreboard and tighten To ensure equal pressure is exerted by all screws alternate tightening each screw until the board is securely fastened The device is now mounted and ready for electrical connections Figure 9 Figure 9 LED mounted on heat sink 5 Luminus Devices Inc T 978 528 8000 e www luminus com 960017 RevB 2011 Luminus Devices Inc All Rights Reserved 1100 Technology Park Drive Billerica MA 01821 L UJ MI f NI LJ S DK 114N series Development Kit Manual LEADER IN BIG CHIP LEDS 3 2 Electrical Connections 1 The power supply being used must be capable of providing sufficient power to drive the LED Preset the output voltage to 0V and keep the power supply switched off until all connections are established The positive terminal of the power supply should be at ground the negative terminal would then supply a negative voltage with respect to ground 2 Connect the driver board to the LED and the power supply using the cables provi
10. nalog voltage Additionally each channel has inputs for PWM dimming using an external function generator and supports frequencies up to 40 kHz 1 Current control via the on board POT is achieved by shorting the Analog ADJ and POT pins Clockwise rotation of the POT increases the current while counter clockwise rotation decreases the current 6 Luminus Devices Inc T 978 528 8000 e www luminus com 960017 RevB 2011 Luminus Devices Inc All Rights Reserved 1100 Technology Park Drive Billerica MA 01821 L LJ IVI i NI LJ DK 114N series Development Kit Manual LEADER IN BIG CHIP LEDS CAUTION The driver board is capable of providing 14 A to any LED LEDs has different drive current limitations and care must be taken not to exceed these limitations Consult product data sheets for current and junction temperature limitations of specific LEDs 2 To determine the current through the LED measure the voltage across the sense resistor test studs see Figure 3 Figure 11 shows the relationship between the sense resistor voltage V____ and the LED current I _ which is also calculated using sense LED V sense I LED Sense where the sense resistance R _ 0 005 Q sense fu E a J C3 Lut l 30 Vs ense mW Figure 11 LED Current as a function of V ense 3 To control the current externally connect the positive of a 0 5 V signal to the Analog ADJ pin and the negative to the GND
11. se conor 9 Luminus Devices Inc T 978 528 8000 1100 Technology Park Drive www luminus com Billerica MA 01821 LUMI N U S DK 114N series Development Kit Manual 1 Key Features e Drive any CBT or PT series Big Chip LED up to 14 A e Pulse frequencies of greater than 40 kHz possible e Analog current control via on board potentiometer or external voltage e Simple current and voltage measurements e Fast rise and fall times less than 1 microsecond e Fast current level switching less than 5 microseconds 2 Development Kit Contents The DK 114N 1 and DK114N 3 are similarin all aspects while the DK 114N 1 supports one channel the DK 114N 3 supports three channels All instructions in this manual are based on the DK 114N 1 and can easily be replicated in the DK 114N 3 As shown in Figure 1 the DK 114N 1 consists of e Heat sink and driver board e Cable assemblies e Thermal interface materials and mounting hardware e User Manual Figure 1 Contents of DK 114N 1 A list of contents of the development kit is given in Appendix A This development kit is designed with flexible features to allow easy evaluation of the Big Chip LEDs but is not optimized for size or for direct integration into end products However the underlying circuit 2 Luminus Devices Inc T 978 528 8000 e www luminus com 960017 RevB 2011 Luminus Devices Inc All Rights Reserved 1100 Technology Park Drive Billerica MA 01821 Zz L UJ M
12. stor coreboard temperature and the resistance between the thermistor test points Note that there is a temperature rise from the thermistor to the LED junction for guidance on estimating the LED junction temperature Tj refer to appropriate product datasheets To monitor coreboard temperature when using the two pin driver board to LED cable the thermistor cable Fig 7 must be connected to the on board thermistor The resistance across the cable s leads can then be used to monitor temperature o E e be F Kl CO ke 10 Resistance k ohm Figure 13 Coreboard temperature as a function of thermistor resistance 8 Luminus Devices Inc T 978 528 8000 e www luminus com 960017 RevB 2011 Luminus Devices Inc All Rights Reserved 1100 Technology Park Drive Billerica MA 01821 LEADER IN BIG CHIP LEDS series Development Kit Manua G gt LUMINUS DK 114N series Development Kit Manual Appendix A Contents of DK 114N 1 and DK 114N 3 Table 2 Table of Contents 1 Heat sink with mounting screws 1 Power supply to driver board cable 1 Driver board to LED cable short for 8 pin LED connector Driver board to LED cable long for 2 pin spade connector Appendix B Grounded Common Anode Topology PT CBT and CST series Big Chip LEDs are built with a common anode configuration where the copper coreboard is at a positive electrical potential with respect the LED cathode In a system with multiple LEDs
13. ut Specifications input Voltage Le Max Supply current channel a ae O meg EECH Output Specifications 12 7 gt 90 Output Pulse Rise time lt 1 lt 1 lt 5 40 V A A Output current ripple pulsed lt 10 i i us Output Pulse Fall Time a us Output Setting Time ae US Control Specifications Max Pulse Frequency Duty Cycle Range 0 100 LS D gt wood A osit P v 0 H S r a a2 S 8 E a H z SEI cje c CS c e e e cis LIN 6 22uF D va ZEIT el zuf ol sey CR R22 10 3 a vee Muf OMIT ovr R78 A We L7 12V R26 Omir ZS gt i RI2 2 F msstrssbRHgsb vn e um d E D ES HH ET Figure 15 Schematic of driver board 11 Luminus Devices Inc T 978 528 8000 e www luminus com 960017 RevB 2011 Luminus Devices Inc All Rights Reserved 1100 Technology Park Drive Billerica MA 01821
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