SLVSHA1 September   2024 TPS1685

ADVANCE INFORMATION  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Comparison Table
  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 Logic Interface
    7. 6.7 Timing Requirements
    8. 6.8 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  Undervoltage Protection
      2. 7.3.2  Insertion Delay
      3. 7.3.3  Overvoltage Protection
      4. 7.3.4  Inrush Current, Overcurrent, and Short-Circuit Protection
        1. 7.3.4.1 Slew rate (dVdt) and Inrush Current Control
          1. 7.3.4.1.1 Start-Up Time Out
        2. 7.3.4.2 Steady-State Overcurrent Protection (Circuit-Breaker)
        3. 7.3.4.3 Active Current Limiting During Start-Up
        4. 7.3.4.4 Short-Circuit Protection
      5. 7.3.5  Analog Load Current Monitor (IMON)
      6. 7.3.6  Mode Selection (MODE)
      7. 7.3.7  Parallel Device Synchronization (SWEN)
      8. 7.3.8  Stacking Multiple eFuses for Unlimited Scalability
        1. 7.3.8.1 Current Balancing During Start-Up
      9. 7.3.9  Analog Junction Temperature Monitor (TEMP)
      10. 7.3.10 Overtemperature Protection
      11. 7.3.11 Fault Response and Indication (FLT)
      12. 7.3.12 Power Good Indication (PG)
      13. 7.3.13 Output Discharge
      14. 7.3.14 FET Health Monitoring
      15. 7.3.15 Single Point Failure Mitigation
        1. 7.3.15.1 IMON Pin Single Point Failure
        2. 7.3.15.2 IREF Pin Single Point Failure
        3. 7.3.15.3 ITIMER Pin Single Point Failure
    4. 7.4 Device Functional Modes
  9. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Single Device, Standalone Operation
      2. 8.1.2 Multiple Devices, Parallel Connection
    2. 8.2 Typical Application: 54V Power Path Protection in Data Center Servers
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
      3. 8.2.3 Application Curves
    3. 8.3 Power Supply Recommendations
      1. 8.3.1 Transient Protection
      2. 8.3.2 Output Short-Circuit Measurements
    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 Receiving Notification of Documentation Updates
    3. 9.3 Support Resources
    4. 9.4 Trademarks
    5. 9.5 Electrostatic Discharge Caution
    6. 9.6 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information
    1. 11.1 Tape and Reel Information
    2. 11.2 Mechanical Data

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）
  • VMA|23
サーマルパッド・メカニカル・データ
発注情報

7.3.4.4 Short-Circuit Protection

During an output short-circuit event, the current through the device increases very rapidly. When an output short-circuit is detected, the internal fast-trip comparator triggers a fast protection sequence to prevent the current from building up further and causing any damage or excessive input supply droop. The fast-trip comparator employs a scalable threshold (ISFT) during steady-state . ISFT can be selected by resistor on SFT_SEL pin. This enables the user to adjust the fast-trip threshold as per system rating, rather than using a high fixed threshold which can not be suitable for all systems. After the current exceeds the fast-trip threshold, the TPS1685x turns off the FET within tSFT. The device also employs a higher fixed fast-trip threshold (IFFT) to provide fast protection against hard short-circuits during steady-state (FET in linear region). After the current exceeds IFFT, the FET is turned off completely within tFFT.

Table 7-1 Device Functional Modes Based on resistor on SFT_SEL Pin

ISFT_SEL

 SFT_SEL pin

MODE pin

8 x IOCP

RSFT_SEL <95kΩ

Open

2.5 x IOCP

105kΩ < RSFT_SEL < 195kΩ

Open

2.8 xIOCP

105kΩ < RSFT_SEL < 195kΩ

Gnd

2 xIOCP

205kΩ < RSFT_SEL < 295kΩ

Open

2.26xIOCP

205kΩ < RSFT_SEL < 295kΩ

Gnd

1.5 xIOCP

305kΩ < RSFT_SEL

Open

1.71xIOCP

305kΩ < RSFT_SEL

Gnd

Figure 7-5 illustrates the short-circuit response for TPS1685x eFuse.

TPS1685 Short-Circuit ResponseFigure 7-5 Short-Circuit Response