JAJSR45 august   2023 TPS92621-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 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  Power Supply (SUPPLY)
        1. 7.3.1.1 Power-On Reset (POR)
        2. 7.3.1.2 Suppply Current in Fault Mode
      2. 7.3.2  Enable and Shutdown(EN)
      3. 7.3.3  Constant-Current Output and Setting (IN)
      4. 7.3.4  Thermal Sharing Resistor (OUT and RES)
      5. 7.3.5  PWM Control (PWM)
      6. 7.3.6  Supply Control
      7. 7.3.7  Diagnostics
        1. 7.3.7.1 LED Short-to-GND Detection
        2. 7.3.7.2 LED Open-Circuit Detection
        3. 7.3.7.3 LED Open-Circuit Detection Enable (DIAGEN)
        4. 7.3.7.4 Overtemperature Protection
        5. 7.3.7.5 Low Dropout Operation
      8. 7.3.8  FAULT Bus Output With One-Fails-All-Fail
      9. 7.3.9  FAULT Table
      10. 7.3.10 LED Fault Summary
      11. 7.3.11 IO Pins Inner Connection
    4. 7.4 Device Functional Modes
      1. 7.4.1 Undervoltage Lockout, V(SUPPLY) < V(POR_rising)
      2. 7.4.2 Normal Operation V(SUPPLY) ≥ 4.5 V
      3. 7.4.3 Low-Voltage Dropout Operation
      4. 7.4.4 Fault Mode
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1 BCM Controlled Rear Lamp With One-Fails-All-Fail Setup
        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 Independent PWM Controlled Rear Lamp By MCU
        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 ドキュメントの更新通知を受け取る方法
    2. 9.2 サポート・リソース
    3. 9.3 Trademarks
    4. 9.4 静電気放電に関する注意事項
    5. 9.5 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

7.3.8 FAULT Bus Output With One-Fails-All-Fail

During normal operation, The FAULT pin of TPS92621-Q1 is weakly pulled up by an internal pullup current source, I(FAULT_pullup). If any fault scenario occurs, the FAULT pin is strongly pulled low by the internal pulldown current sink, I(FAULT_pulldown) to report out the fault alarm.

Meanwhile, the TPS92621-Q1 also monitors the FAULT pin voltage internally. If the FAULT pin of the TPS92621-Q1 is pulled low by external current sink below VIL(FAULT), the current output is turned off even though there is no fault detected on owned output. The device does not resume to normal operation until the FAULT pin voltage rises above VIH(FAULT).

Based on this feature, the TPS92621-Q1 device is able to construct a FAULT bus by tying FAULT pins from multiple TPS92621-Q1 devices to achieve one-fails-all-fail function as Figure 7-6 showing. The lower side TPS92621-Q1 (B) detects any kind of LED fault and pulls low the FAULT pin. The low voltage on FAULT pin is detected by upper side TPS92621-Q1 (A) because the FAULT pins of two devices are connected. The upper side TPS92621-Q1 (A) turns off output current as a result. If the FAULT pins of each TPS92621-Q1 are all connected to drive the base of an external PNP transistor as illustrated in Figure 7-7, the one-fails-all-fail function is disabled and only the faulty channel device is turned off.

GUID-20230424-SS0I-VDVD-2XDV-DHRBPQVQTHRT-low.svg Figure 7-6 FAULT Bus for One-Fails-All-Fail Application

GUID-20230424-SS0I-WBQ0-GS5Q-CJXVNSLNRWDP-low.svg Figure 7-7 FAULT Bus for One-Fails-Others-On Application