JAJSCF6G July   2016  – December  2019 TPS2660

PRODUCTION DATA.  

  1. 1 特長
  2. 2 アプリケーション
    1.     概略回路図
  3. 3 概要
    1.     -60V電源における入力逆極性保護
  4. 4 改訂履歴
  5. 5 概要（続き）
  6. 6 Device Comparison Table
  7. 7 Pin Configuration and Functions
    1.     Pin Functions
  8. 8 Specifications
    1. 8.1 Absolute Maximum Ratings
    2. 8.2 ESD Ratings
    3. 8.3 Recommended Operating Conditions
    4. 8.4 Thermal Information
    5. 8.5 Electrical Characteristics
    6. 8.6 Timing Requirements
    7. 8.7 Typical Characteristics
  9. 9 Parameter Measurement Information
  10. 10Detailed Description
    1. 10.1 Overview
    2. 10.2 Functional Block Diagram
    3. 10.3 Feature Description
      1. 10.3.1 Undervoltage Lockout (UVLO)
      2. 10.3.2 Overvoltage Protection (OVP)
      3. 10.3.3 Reverse Input Supply Protection
      4. 10.3.4 Hot Plug-In and In-Rush Current Control
      5. 10.3.5 Overload and Short Circuit Protection
        1. 10.3.5.1 Overload Protection
          1. 10.3.5.1.1 Active Current Limiting
          2. 10.3.5.1.2 Electronic Circuit Breaker with Overload Timeout, MODE = OPEN
        2. 10.3.5.2 Short Circuit Protection
          1. 10.3.5.2.1 Start-Up With Short-Circuit On Output
        3. 10.3.5.3 FAULT Response
          1. 10.3.5.3.1 Look Ahead Overload Current Fault Indicator
        4. 10.3.5.4 Current Monitoring
        5. 10.3.5.5 IN, OUT, RTN, and GND Pins
        6. 10.3.5.6 Thermal Shutdown
        7. 10.3.5.7 Low Current Shutdown Control (SHDN)
    4. 10.4 Device Functional Modes
  11. 11Application and Implementation
    1. 11.1 Application Information
    2. 11.2 Typical Application
      1. 11.2.1 Design Requirements
      2. 11.2.2 Detailed Design Procedure
        1. 11.2.2.1 Step by Step Design Procedure
        2. 11.2.2.2 Programming the Current-Limit Threshold—R(ILIM) Selection
        3. 11.2.2.3 Undervoltage Lockout and Overvoltage Set Point
        4. 11.2.2.4 Programming Current Monitoring Resistor—RIMON
        5. 11.2.2.5 Setting Output Voltage Ramp Time—(tdVdT)
          1. 11.2.2.5.1 Case 1: Start-Up Without Load—Only Output Capacitance C(OUT) Draws Current During Start-Up
          2. 11.2.2.5.2 Case 2: Start-Up With Load—Output Capacitance C(OUT) and Load Draws Current During Start-Up
          3. 11.2.2.5.3 Support Component Selections—RFLTb and C(IN)
      3. 11.2.3 Application Curves
    3. 11.3 System Examples
      1. 11.3.1 Acive ORing Operation
      2. 11.3.2 Field Supply Protection in PLC, DCS I/O Modules
      3. 11.3.3 Simple 24-V Power Supply Path Protection
    4. 11.4 Do's and Don'ts
  12. 12Power Supply Recommendations
    1. 12.1 Transient Protection
  13. 13Layout
    1. 13.1 Layout Guidelines
    2. 13.2 Layout Example
  14. 14デバイスおよびドキュメントのサポート
    1. 14.1 デバイス・サポート
    2. 14.2 ドキュメントのサポート
      1. 14.2.1 関連資料
    3. 14.3 ドキュメントの更新通知を受け取る方法
    4. 14.4 コミュニティ・リソース
    5. 14.5 商標
    6. 14.6 静電気放電に関する注意事項
    7. 14.7 Glossary
  15. 15メカニカル、パッケージ、および注文情報

10.3.4 Hot Plug-In and In-Rush Current Control

The devices are designed to control the in-rush current upon insertion of a card into a live backplane or other "hot" power source. This limits the voltage sag on the backplane’s supply voltage and prevents unintended resets of the system power. The controlled start-up also helps to eliminate conductive and radiative interferences. An external capacitor connected from the dVdT pin to RTN defines the slew rate of the output voltage at power-on as shown in Figure 37 and Figure 38.

TPS2660 Cdvdt_Diagram.gifFigure 37. Output Ramp Up Time tdVdT is Set by C(dVdT)

The dVdT pin can be left floating to obtain a predetermined slew rate (tdVdT) on the output. When the terminal is left floating, the devices set an internal output voltage ramp rate of 23.9 V/1.6 ms. A capacitor can be connected from dVdT pin to RTN to program the output voltage slew rate slower than 23.9 V/1.6 ms. Use Equation 1 and Equation 2 to calculate the external C(dVdT) capacitance.

Equation 1 governs slew rate at start-up.

Equation 1. TPS2660 equ_01_SLVSDG2.gif

where

  • I(dVdT) = 4.7 µA (typical)
  • TPS2660 equ_02_SLVSDG2.gif
  • Gain(dVdT) = dVdT to VOUT gain = 24.6

The total ramp time (tdVdT) of V(OUT) for 0 to V(IN) can be calculated using Equation 2.

Equation 2. tdVdT = 8 × 103 × V(IN) × C(dVdT)
TPS2660 scope_shot_05_slvsdg2.png
CdVdT = 22 nF COUT = 47 µF RILIM = 5.36 kΩ
Figure 38. Hot Plug-In and In-Rush Current Control at 24-V Input