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Summary of Contents for Texas Instruments AN-2255
- Page 1 AN-2255 LM3463 Evaluation Board User's Guide Literature Number: SNVA642 May 2012...
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Page 2: Table Of Contents
....................Analog Dimming Control ....................... PWM Dimming Control ....................Disabling Output Channel(s) ................Cascading the LM3463 evaluation board ........................PCB Design ......................Typical Waveforms Table of Contents SNVA642 – May 2012 Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated... - Page 3 A 12 channel lighting system using DC interface mode for dimming control ........A 12 channel lighting system using Direct PWM mode for dimming control All trademarks are the property of their respective owners. SNVA642 – May 2012 List of Figures Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated...
- Page 4 VIN, GND and VFB, the dynamic Headroom Control (DHC) circuit of the LM3463 adjusts the output voltage of the primary power supply to maximize system efficiency. AN-2255 LM3463 Evaluation Board SNVA642 – May 2012 Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated...
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Page 5: Introduction
• Output current per ch.: 200 mA • System clock freq.: 246 kHz • DHC cut-off freq.: 0.1Hz • Mode of dimming control: Direct PWM Mode SNVA642 – May 2012 AN-2255 LM3463 Evaluation Board Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated... -
Page 6: Lm3463 Evaluation Board Schematic
J15, j16 Q1, Q2, Q3, Q4, MOSFET, N-CH, 150V, 29A DPAK FDD2572 Fairchild Semiconductor Q5, Q6 Resistor, 150 kΩ, 1%, 0.1W 0603 CRCW0603150KFKEA Vishay-Dale AN-2255 LM3463 Evaluation Board SNVA642 – May 2012 Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated... - Page 7 TP51, TP52, TP53, TP55, TP57, TP59, TP61, TP63 Test Point 5005 Keystone TP38 Test Point White 5007 Keystone TP39 Test Point Black 5006 Keystone SNVA642 – May 2012 AN-2255 LM3463 Evaluation Board Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated...
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Page 8: Board Layout
Board Layout www.ti.com Board Layout Figure 2. Top Layer Figure 3. Bottom Layer AN-2255 LM3463 Evaluation Board SNVA642 – May 2012 Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated... -
Page 9: Connection Diagram
Control (DHC) circuit of the LM3463 to maintain maximum system efficiency, therefore the V must have RAIL a wide and adjustable voltage range. SNVA642 – May 2012 AN-2255 LM3463 Evaluation Board Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated... - Page 10 DHC_READY LED-MAX-COLD 3. V + 5V RAIL(peak) DHC_READY Figure 4 shows a suggested procedure to determine the V and V RAIL(nom) DHC_READY RAIL(peak) AN-2255 LM3463 Evaluation Board SNVA642 – May 2012 Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated...
- Page 11 LM3463 evaluation board. If the power supply is an off-the-shelf product, the output voltage and value of the output voltage feedback resistor divider may need to be changed to allow DHC. SNVA642 – May 2012 AN-2255 LM3463 Evaluation Board Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated...
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Page 12: Response Of The Dhc Loop
. as shown in Figure 6. The t is adjusted dependent on the value of the C4 and DHC_READY RISR, which governed by the following equation: AN-2255 LM3463 Evaluation Board SNVA642 – May 2012 Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated... -
Page 13: Mosfet Power Dissipation Limit
PWM Dimming Control The LM3463 evaluation board allows three different modes of PWM dimming control: • Direct PWM Dimming Mode SNVA642 – May 2012 AN-2255 LM3463 Evaluation Board Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated... - Page 14 LM3463 the terminal TP16 (DIM4) should be pulled low to generate a falling edge to indicate an ‘End-Of-Frame (EOF)’. Figure 7 shows the typical waveform of a data frame and the corresponding clock and EOF signals. AN-2255 LM3463 Evaluation Board SNVA642 – May 2012 Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated...
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Page 15: Typical Waveforms Of A Complete Data Frame In The Serial Interface Mode
In the serial interface mode, the six output channels are grouped into four individual groups. The on duty of each group is controlled by the value of a specific data byte as listed in the following table: SNVA642 – May 2012 AN-2255 LM3463 Evaluation Board Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated... - Page 16 2/256 on duty. Figure 9 shows the Conversion characteristics of the analog voltage to PWM dimming control circuit: AN-2255 LM3463 Evaluation Board SNVA642 – May 2012 Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated...
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Page 17: Disabling Output Channel(S)
DHC. Generally it is suggested not to cascade more than four pieces of the LM3463 evaluation board to secure stable system operation. SNVA642 – May 2012 AN-2255 LM3463 Evaluation Board Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated... -
Page 18: Pcb Design
LOAD Interface to MCU for SCLK dimming control SDAT Figure 12. A 12 channel lighting system using serial interface mode for dimming control AN-2255 LM3463 Evaluation Board SNVA642 – May 2012 Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated... - Page 19 Logic level PWM DIM4 dimming control DIM23 signals DIM01 Figure 14. A 12 channel lighting system using Direct PWM mode for dimming control SNVA642 – May 2012 AN-2255 LM3463 Evaluation Board Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated...
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Page 20: Typical Waveforms
PWM dimming delay at V rising delay at V falling OUTn DIMn OUTn DIMn ch-ch delay ch-ch delay OUTn OUTn rising falling OUTn OUTn AN-2255 LM3463 Evaluation Board SNVA642 – May 2012 Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated... - Page 21 Any exceptions to this are strictly prohibited and unauthorized by Texas Instruments unless user has obtained appropriate experimental/development licenses from local regulatory authorities, which is responsibility of user including its acceptable authorization.
- Page 22 FCC Interference Statement for Class B EVM devices This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications.
- Page 23 Also, please do not transfer this product, unless you give the same notice above to the transferee. Please note that if you could not follow the instructions above, you will be subject to penalties of Radio Law of Japan. Texas Instruments Japan Limited (address) 24-1, Nishi-Shinjuku 6 chome, Shinjuku-ku, Tokyo, Japan http://www.tij.co.jp...
- Page 24 FDA Class III or similar classification, then you must specifically notify TI of such intent and enter into a separate Assurance and Indemnity Agreement. Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265 Copyright © 2012, Texas Instruments Incorporated...
- Page 25 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.
- Page 26 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Texas Instruments LM3463EVM...
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