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AN-1993 LM3406HV Evaluation Board with 2 Wire
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Introduction
The LM3406HV is a buck regulator controlled current source designed to drive a series string of high
power, high brightness LEDs (HBLEDs) such as the Luxeon™ K2 Emitter at forward currents of up to
1.5A. The converter's output voltage adjusts as needed to maintain a constant current through the LED
array.
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SNVA407B – August 2009 – Revised May 2013
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Figure 1. Complete Circuit Schematic
AN-1993 LM3406HV Evaluation Board with 2 Wire Dimming
Copyright © 2009–2013, Texas Instruments Incorporated
User's Guide
SNVA407B – August 2009 – Revised May 2013
Dimming
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Summary of Contents for Texas Instruments AN-1993 LM3406HV
- Page 1 Figure 1. Complete Circuit Schematic All trademarks are the property of their respective owners. SNVA407B – August 2009 – Revised May 2013 AN-1993 LM3406HV Evaluation Board with 2 Wire Dimming Submit Documentation Feedback Copyright © 2009–2013, Texas Instruments Incorporated...
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Page 2: Setting The Led Current
J2 should be removed, and R6 changed according to the following equation: AN-1993 LM3406HV Evaluation Board with 2 Wire Dimming SNVA407B – August 2009 – Revised May 2013 Submit Documentation Feedback Copyright ©... - Page 3 MOSFET dimming. The output capacitor should be removed to take full advantage of parallel MOSFET dimming. SNVA407B – August 2009 – Revised May 2013 AN-1993 LM3406HV Evaluation Board with 2 Wire Dimming Submit Documentation Feedback Copyright © 2009–2013, Texas Instruments Incorporated...
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Page 4: Low Power Shutdown
BOOT LM3406HV VOUT COMP Figure 4. Schottky Diode Protection for Open-Circuit AN-1993 LM3406HV Evaluation Board with 2 Wire Dimming SNVA407B – August 2009 – Revised May 2013 Submit Documentation Feedback Copyright © 2009–2013, Texas Instruments Incorporated... -
Page 5: Bill Of Materials
Keystone 1598–2 Keystone , DIM1, DIM2, DPWR, GND2, LED+, OFF*, VIN, 575–8 Terminal 575–8 Keystone SNVA407B – August 2009 – Revised May 2013 AN-1993 LM3406HV Evaluation Board with 2 Wire Dimming Submit Documentation Feedback Copyright © 2009–2013, Texas Instruments Incorporated... -
Page 6: Typical Performance Characteristics
Number of InGaN LEDs in Series Output Current 16.0 32.0 48.0 64.0 80.0 INPUT VOLTAGE (V) AN-1993 LM3406HV Evaluation Board with 2 Wire Dimming SNVA407B – August 2009 – Revised May 2013 Submit Documentation Feedback Copyright © 2009–2013, Texas Instruments Incorporated... - Page 7 DIM1 Response (Falling) 0.5A/DIV 0.5A/DIV 20V/DIV 20V/DIV DIM1 5V/DIV 5V/DIV DIM1 2 és/DIV 2 és/DIV SNVA407B – August 2009 – Revised May 2013 AN-1993 LM3406HV Evaluation Board with 2 Wire Dimming Submit Documentation Feedback Copyright © 2009–2013, Texas Instruments Incorporated...
- Page 8 Start Up using OFF Terminal Shutdown using OFF Terminal 0.5A/DIV 0.5A/DIV 20V/DIV 20V/DIV 2V/DIV 2V/DIV 2 ms/DIV 2 és/DIV AN-1993 LM3406HV Evaluation Board with 2 Wire Dimming SNVA407B – August 2009 – Revised May 2013 Submit Documentation Feedback Copyright © 2009–2013, Texas Instruments Incorporated...
- Page 9 Layout www.ti.com Layout Figure 5. Top Layer and Top Overlay SNVA407B – August 2009 – Revised May 2013 AN-1993 LM3406HV Evaluation Board with 2 Wire Dimming Submit Documentation Feedback Copyright © 2009–2013, Texas Instruments Incorporated...
- Page 10 Layout www.ti.com Figure 6. Bottom Layer and Bottom Overlay AN-1993 LM3406HV Evaluation Board with 2 Wire Dimming SNVA407B – August 2009 – Revised May 2013 Submit Documentation Feedback Copyright © 2009–2013, Texas Instruments Incorporated...
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Page 11: Important Notice
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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