Texas Instruments TPS92691 User Manual
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Texas Instruments TPS92691 User Manual

Texas Instruments TPS92691 User Manual

Sepic led driver evaluation board
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TPS92691 SEPIC LED Driver Evaluation Board
This user's guide describes the characteristics, operation, and use of the TPS92691 SEPIC Evaluation
Module (EVM). A complete schematic diagram, printed-circuit board layouts, and bill of materials are
included in this document.
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1
Introduction
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2
Description
2.1
Typical Applications
2.2
Features
3
3.1
J1, VIN, GND
3.2
J2, LED+, LED-
3.3
TP1, SHUTDOWN
3.4
TP2, SYNC
3.5
TP3, PWM
3.6
3.7
4
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5
6
6.1
Efficiency
6.2
6.3
6.4
6.5
6.6
6.7
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6.8
EMI
7
8
9
1
Connection Diagram
2
PFET Device
3
Alternate Configuration With a Low-Side Current Sense and a Low-Side Series NFET Device
4
5
6
7
8
Output LED Current vs Input Voltage (V
9
Output LED Current vs Input Voltage (V
10
Output LED Current vs. LED String Configuration (V
All trademarks are the property of their respective owners.
SLVUAL8 - December 2015
Submit Documentation Feedback
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IADJ
IADJ
IADJ
Copyright © 2015, Texas Instruments Incorporated
Contents
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List of Figures
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= 140 mV)
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= 420 mV)
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= 700 mV)
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= 140 mV)
IADJ
TPS92691 SEPIC LED Driver Evaluation Board
User's Guide
SLVUAL8 - December 2015
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  • Page 1: Table Of Contents

    SLVUAL8 – December 2015 TPS92691 SEPIC LED Driver Evaluation Board This user's guide describes the characteristics, operation, and use of the TPS92691 SEPIC Evaluation Module (EVM). A complete schematic diagram, printed-circuit board layouts, and bill of materials are included in this document.
  • Page 2 Top Layer and Top Overlay (Top View) ..............Bottom Layer and Bottom Overlay (Bottom View) List of Tables ............TPS92691EVM-001 Electrical Performance Specifications ......................Bill of Materials TPS92691 SEPIC LED Driver Evaluation Board SLVUAL8 – December 2015 Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated...
  • Page 3 The current monitor output is used in conjunction with microcontroller or discrete circuitry to implement customized fault protection schemes. Typical Applications This converter design describes an application of the TPS92691-Q1 device as a SEPIC LED driver with the specifications described in Table 1.
  • Page 4 TP3, PWM The PWM test point connects through a 1-kΩ resistor to the PWM pin of the TPS92691-Q1 device. Leave open for normal operation. If PWM dimming is used, apply a square wave with a low level of GND and a high level of between 3 V and 5 V.

  • Page 5: Connector Description

    TP5, IADJ The IADJ test point connects through a two-pole low-pass filter to the IADJ pin of the TPS92691-Q1 device. The default reference is set to 420 mV through a resistor divider network connected to VCC resulting in output current of 300 mA. The voltage on IADJ can be externally set using either a pulse width modulated signal from function generator or a DC power supply between 140 mV to over 2.4 V.

  • Page 6: Schematic

    Schematic www.ti.com Schematic Figure 2. TPS92691EVM-001 Schematic: Configured With a High-Side Current Sense and a High-Side Series PFET Device TPS92691 SEPIC LED Driver Evaluation Board SLVUAL8 – December 2015 Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated...
  • Page 7 Schematic www.ti.com Figure 3. Alternate Configuration With a Low-Side Current Sense and a Low-Side Series NFET Device SLVUAL8 – December 2015 TPS92691 SEPIC LED Driver Evaluation Board Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated...

  • Page 8: Performance Data And Typical Characteristic Curves

    = 300mA = 500mA Input Voltage, VIN (V) D003 Figure 6. Efficiency vs. Input Voltage (Number of Series-Connected LEDs = 13) TPS92691 SEPIC LED Driver Evaluation Board SLVUAL8 – December 2015 Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated...

  • Page 9: Line Regulation

    LEDs = 13 Input Voltage, VIN (V) D006 Figure 9. Output LED Current vs Input Voltage (V = 700 mV) IADJ SLVUAL8 – December 2015 TPS92691 SEPIC LED Driver Evaluation Board Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated...

  • Page 10: Load Regulation

    VIN = 18V No. of LEDs in Series D009 Figure 12. Output LED Current vs. LED String Configuration (V = 700 mV) IADJ TPS92691 SEPIC LED Driver Evaluation Board SLVUAL8 – December 2015 Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated...

  • Page 11: Temperature Characteristics

    Temperature ( D012 Figure 15. LED Current Error vs. Ambient Temperature (VIN = 14 V, Number of LEDs in series = 13) SLVUAL8 – December 2015 TPS92691 SEPIC LED Driver Evaluation Board Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated...

  • Page 12: Analog Adjust Settings

    AGND * Depopulate resistors prior to connecting external signal to IADJ test point, TP5 Figure 16. Circuit Configurations to Set Analog Adjust Reference Voltage TPS92691 SEPIC LED Driver Evaluation Board SLVUAL8 – December 2015 Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated...

  • Page 13: Output Led Current Vs. Iadj Voltage

    IADJ PWM Dimming In order to enable EVM at power-up, the PWM pin of TPS92691-Q1 is tied to VCC through a 100-kΩ pullup resistor, R14. The PWM pin can be over-driven by connecting an external digital signal, generated through a microcontroller or function generator, to PWM test point, TP3. PWM pin can be pulled to ground to disable switching under fault conditions.

  • Page 14: Pwm Dimming

    Figure 23. PWM Dimming (Duty Cycle = 50 %, Frequency = Figure 24. PWM Dimming (Duty cycle = 50 %, Frequency = 240 Hz) 240 Hz) TPS92691 SEPIC LED Driver Evaluation Board SLVUAL8 – December 2015 Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated...

  • Page 15: Imon Response To Led Open-Circuit Fault

    Figure 28. IMON Response to LED Short-Circuit Fault 123456781Ch1: Input voltage; Ch4: LED current; Time: 200 ms/div Figure 29. Start-Stop (Warm-Crank) Transient Response SLVUAL8 – December 2015 TPS92691 SEPIC LED Driver Evaluation Board Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated...

  • Page 16: Start-Stop (Warm-Crank)Transient Response

    123456718Ch1: Input voltage; Ch4: LED current; Time: 1 ms/div Figure 30. Start-Stop (Warm-Crank)Transient Response Figure 31. Conducted EMI Based on CISPR 25 Class 3 Limits TPS92691 SEPIC LED Driver Evaluation Board SLVUAL8 – December 2015 Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated...

  • Page 17: Optimizing Evm Performance Based On Led String Voltage And Current

    = R15, based on the maximum expected LED stack voltage. The proportional integral compensation network can be tuned to achieve high bandwidth and desired phase margin for a specified range of input and output voltages. For more details and design procedure refer to the TPS92691-Q1 datasheet.

  • Page 18: Top Layer And Top Overlay (Top View)

    TPS92691EVM-001 Assembly Drawing and PCB layout www.ti.com Figure 33. Top Layer and Top Overlay (Top View) Figure 34. Bottom Layer and Bottom Overlay (Bottom View) TPS92691 SEPIC LED Driver Evaluation Board SLVUAL8 – December 2015 Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated...

  • Page 19: Bill Of Materials

    CRCW06032K00FKEA Vishay-Dale 10.0 RES, 10.0, 1%, 0.25 W, 1206 1206 CRCW120610R0FKEA Vishay-Dale RES, 0, 5%, 0.25 W, 1206 1206 CRCW12060000Z0EA Vishay-Dale SLVUAL8 – December 2015 TPS92691 SEPIC LED Driver Evaluation Board Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated...
  • Page 20 RES, 102 k, 1%, 0.1 W, 0603 0603 CRCW0603102KFKEA Vishay-Dale R26, R27 1.0k RES, 1.0 k, 5%, 0.1 W, 0603 0603 CRCW06031K00JNEA Vishay-Dale TPS92691 SEPIC LED Driver Evaluation Board SLVUAL8 – December 2015 Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated...
  • Page 21 STANDARD TERMS AND CONDITIONS FOR EVALUATION MODULES Delivery: TI delivers TI evaluation boards, kits, or modules, including any accompanying demonstration software, components, or documentation (collectively, an “EVM” or “EVMs”) to the User (“User”) in accordance with the terms and conditions set forth herein. Acceptance of the EVM is expressly subject to the following terms and conditions.
  • Page 22 FCC Interference Statement for Class B EVM devices NOTE: 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.
  • Page 23 【無線電波を送信する製品の開発キットをお使いになる際の注意事項】 開発キットの中には技術基準適合証明を受けて いないものがあります。 技術適合証明を受けていないもののご使用に際しては、電波法遵守のため、以下のいずれかの 措置を取っていただく必要がありますのでご注意ください。 1. 電波法施行規則第6条第1項第1号に基づく平成18年3月28日総務省告示第173号で定められた電波暗室等の試験設備でご使用 いただく。 2. 実験局の免許を取得後ご使用いただく。 3. 技術基準適合証明を取得後ご使用いただく。 なお、本製品は、上記の「ご使用にあたっての注意」を譲渡先、移転先に通知しない限り、譲渡、移転できないものとします。 上記を遵守頂けない場合は、電波法の罰則が適用される可能性があることをご留意ください。 日本テキサス・イ ンスツルメンツ株式会社 東京都新宿区西新宿６丁目２４番１号 西新宿三井ビル 3.3.3 Notice for EVMs for Power Line Communication: Please see http://www.tij.co.jp/lsds/ti_ja/general/eStore/notice_02.page 電力線搬送波通信についての開発キットをお使いになる際の注意事項については、次のところをご覧くださ い。http://www.tij.co.jp/lsds/ti_ja/general/eStore/notice_02.page SPACER EVM Use Restrictions and Warnings: 4.1 EVMS ARE NOT FOR USE IN FUNCTIONAL SAFETY AND/OR SAFETY CRITICAL EVALUATIONS, INCLUDING BUT NOT LIMITED TO EVALUATIONS OF LIFE SUPPORT APPLICATIONS.
  • Page 24 Notwithstanding the foregoing, any judgment may be enforced in any United States or foreign court, and TI may seek injunctive relief in any United States or foreign court. Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265 Copyright © 2015, 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.

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