JAJSOL0A November   2022  – January 2024 TPS92620-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 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1  Power Supply (SUPPLY)
        1. 6.3.1.1 Power-On Reset (POR)
        2. 6.3.1.2 Suppply Current in Fault Mode
      2. 6.3.2  Enable and Shutdow(EN)
      3. 6.3.3  Constant-Current Output and Setting (INx)
      4. 6.3.4  Thermal Sharing Resistor (OUTx and RESx)
      5. 6.3.5  PWM Control (PWMx)
      6. 6.3.6  Supply Control
      7. 6.3.7  Diagnostics
        1. 6.3.7.1 LED Short-to-GND Detection
        2. 6.3.7.2 LED Open-Circuit Detection
        3. 6.3.7.3 LED Open-Circuit Detection Enable (DIAGEN)
        4. 6.3.7.4 Overtemperature Protection
        5. 6.3.7.5 Low Dropout Operation
      8. 6.3.8  FAULT Bus Output With One-Fails-All-Fail
      9. 6.3.9  FAULT Table
      10. 6.3.10 LED Fault Summary
      11. 6.3.11 IO Pins Inner Connection
    4. 6.4 Device Functional Modes
      1. 6.4.1 Undervoltage Lockout, V(SUPPLY) < V(POR_rising)
      2. 6.4.2 Normal Operation V(SUPPLY) ≥ 4.5V
      3. 6.4.3 Low-Voltage Dropout Operation
      4. 6.4.4 Fault Mode
  8. 7 Application and Implementation
    1. 7.1 Application Information
    2. 7.2 Typical Applications
      1. 7.2.1 BCM Controlled Rear Lamp With One-Fails-All-Fail Setup
        1. 7.2.1.1 Design Requirements
        2. 7.2.1.2 Detailed Design Procedure
        3. 7.2.1.3 Application Curves
      2. 7.2.2 Independent PWM Controlled Rear Lamp By MCU
        1. 7.2.2.1 Design Requirements
        2. 7.2.2.2 Detailed Design Procedure
        3. 7.2.2.3 Application Curves
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
      2. 7.4.2 Layout Example
  9. 8 Device and Documentation Support
    1. 8.1 ドキュメントの更新通知を受け取る方法
    2. 8.2 サポート・リソース
    3. 8.3 Trademarks
    4. 8.4 静電気放電に関する注意事項
    5. 8.5 用語集
  10. 9 Revision History
  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

6.3.3 Constant-Current Output and Setting (INx)

The TPS92620-Q1 device is a high-side current driver for driving LEDs. The device controls each output current through regulating the voltage drop on an external high-side current-sense resistor, R(SNSx) independently for each channel. An integrated error amplifier drives an internal power transistor to maintain the voltage drop on the current-sense resistor R(SNSx) to V(CS_REG) and therefore regulates the current output to target value. When the output current is in regulation, use Equation 1 to calculate the current value for each channel.

Equation 1. GUID-64B577D0-F80F-4811-B2DC-A8EE0B3EA4A7-low.gif

where

  • V(CS_REG) = 150mV
  • x = 1, or 2 for output channel 1 or 2

When the supply voltage drops below total LED string forward voltage plus required headroom voltage, the sum of V(DROPOUT) and V(CS_REG), the TPS92620-Q1 is not able to deliver enough current output as set by the value of R(SNSx), and the voltage across the current-sense resistor R(SNSx) is less than V(CS_REG).