JAJSK36A October   2020  – September 2023 DAC43701-Q1 , DAC53701-Q1

PRODUCTION DATA  

  1.   1
  2. 1 特長
  3. 2 アプリケーション
  4. 3 概要
  5. 4 Revision History
  6. 5 Pin Configuration and Functions
  7. 6 Specifications
    1. 6.1  Absolute Maximum Ratings
    2. 6.2  ESD Ratings
    3. 6.3  Recommended Operating Conditions
    4. 6.4  Thermal Information
    5. 6.5  Electrical Characteristics
    6. 6.6  Timing Requirements: I2C Standard Mode
    7. 6.7  Timing Requirements: I2C Fast Mode
    8. 6.8  Timing Requirements: I2C Fast-Mode Plus
    9. 6.9  Timing Requirements: GPI
    10. 6.10 Timing Diagram
    11. 6.11 Typical Characteristics: VDD = 5.5 V (Reference = VDD) or VDD = 5 V (Internal Reference)
    12. 6.12 Typical Characteristics: VDD = 1.8 V (Reference = VDD) or VDD = 2 V (Internal Reference)
    13. 6.13 Typical Characteristics
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Digital-to-Analog Converter (DAC) Architecture
        1. 7.3.1.1 Reference Selection and DAC Transfer Function
          1. 7.3.1.1.1 Power Supply as Reference
          2. 7.3.1.1.2 Internal Reference
      2. 7.3.2 General-Purpose Input (GPI)
      3. 7.3.3 DAC Update
        1. 7.3.3.1 DAC Update Busy
      4. 7.3.4 Nonvolatile Memory (EEPROM or NVM)
        1. 7.3.4.1 NVM Cyclic Redundancy Check
        2. 7.3.4.2 NVM_CRC_ALARM_USER Bit
        3. 7.3.4.3 NVM_CRC_ALARM_INTERNAL Bit
      5. 7.3.5 Programmable Slew Rate
      6. 7.3.6 Power-On Reset (POR)
      7. 7.3.7 Software Reset
      8. 7.3.8 Device Lock Feature
      9. 7.3.9 PMBus Compatibility
    4. 7.4 Device Functional Modes
      1. 7.4.1 Power Down Mode
      2. 7.4.2 Continuous Waveform Generation (CWG) Mode
      3. 7.4.3 PMBus Compatibility Mode
    5. 7.5 Programming
      1. 7.5.1 F/S Mode Protocol
      2. 7.5.2 I2C Update Sequence
        1. 7.5.2.1 Address Byte
          1. 7.5.2.1.1 Target Address Configuration
        2. 7.5.2.2 Command Byte
      3. 7.5.3 I2C Read Sequence
    6. 7.6 Register Map
      1. 7.6.1  STATUS Register (address = D0h) [reset = 000Ch or 0014h]
      2. 7.6.2  GENERAL_CONFIG Register (address = D1h) [reset = 01F0h]
      3. 7.6.3  CONFIG2 Register (address = D2h) [reset = device-specific]
      4. 7.6.4  TRIGGER Register (address = D3h) [reset = 0008h]
      5. 7.6.5  DAC_DATA Register (address = 21h) [reset = 0000h]
      6. 7.6.6  DAC_MARGIN_HIGH Register (address = 25h) [reset = device-specific]
      7. 7.6.7  DAC_MARGIN_LOW Register (address = 26h) [reset =device-specific]
      8. 7.6.8  PMBUS_OPERATION Register (address = 01h) [reset = 0000h]
      9. 7.6.9  PMBUS_STATUS_BYTE Register (address = 78h) [reset = 0000h]
      10. 7.6.10 PMBUS_VERSION Register (address = 98h) [reset = 2200h]
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1 Power-Supply Margining
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
        3. 8.2.1.3 Application Curves
      2. 8.2.2 LED Thermal Foldback
        1. 8.2.2.1 Design Requirements
        2. 8.2.2.2 Detailed Design Procedure
        3. 8.2.2.3 Application Curves
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Documentation Support
      1. 9.1.1 Related Documentation
    2. 9.2 ドキュメントの更新通知を受け取る方法
    3. 9.3 サポート・リソース
    4. 9.4 Trademarks
    5. 9.5 静電気放電に関する注意事項
    6. 9.6 用語集
  11. 10Mechanical, Packaging, and Orderable Information

パッケージ・オプション

メカニカル・データ（パッケージ｜ピン）
サーマルパッド・メカニカル・データ
発注情報

8.2.2 LED Thermal Foldback

The reliability of LED lights is inversely proportional to the operating temperature. Most LED lighting designs implement a heat sink for thermal management. However, to improve the life of the LEDs, an active thermal-foldback loop is needed to avoid over-design of the thermal management components. The daytime running light (DRL) in automotive lighting remains always on and is exposed to sunlight during daytime. Thermal foldback is a necessity in DRLs to maximize the LED life. DACx3701-Q1 provides a thermal-foldback loop using the force-sense output of the DAC. Figure 8-4 shows a simplified circuit diagram of the LED thermal foldback.

GUID-20200924-CA0I-JD71-ZD13-CV2CPLWQVZFZ-low.svg Figure 8-4 LED Thermal Foldback