JAJSEC9D May   2014  – January 2018 TPS6213013A-Q1 , TPS62130A-Q1 , TPS62133A-Q1

PRODUCTION DATA.  

  1. 1 特長
  2. 2 アプリケーション
  3. 3 概要
    1.     Device Images
      1.      代表的なアプリケーションの回路図
      2.      効率と出力電流との関係
  4. 4 改訂履歴
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and Functions
    1.     Pin Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Typical Characteristics
  8. 8 Parameter Measurement Information
  9. 9 Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1  Pulse Width Modulation (PWM) Operation
      2. 9.3.2  Power Save Mode Operation
      3. 9.3.3  100% Duty-Cycle Operation
      4. 9.3.4  Enable / Shutdown (EN)
      5. 9.3.5  Soft Start / Tracking (SS/TR)
      6. 9.3.6  Current Limit And Short Circuit Protection
      7. 9.3.7  Power Good (PG)
      8. 9.3.8  Pin-Selectable Output Voltage (DEF)
      9. 9.3.9  Frequency Selection (FSW)
      10. 9.3.10 Under Voltage Lockout (UVLO)
      11. 9.3.11 Thermal Shutdown
    4. 9.4 Device Functional Modes
      1. 9.4.1 Operation Above TJ=125°C
      2. 9.4.2 Operation with VIN < 3V
      3. 9.4.3 Operation with Separate EN Control
  10. 10Application and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Application
      1. 10.2.1 TPS62130A-Q1 Point-Of-Load Step Down Converter
        1. 10.2.1.1 Design Requirements
        2. 10.2.1.2 Detailed Design Procedure
          1. 10.2.1.2.1 Custom Design With WEBENCH® Tools
          2. 10.2.1.2.2 Programming The Output Voltage
          3. 10.2.1.2.3 External Component Selection
          4. 10.2.1.2.4 Inductor Selection
          5. 10.2.1.2.5 Output Capacitor
          6. 10.2.1.2.6 Input Capacitor
          7. 10.2.1.2.7 Soft Start Capacitor
          8. 10.2.1.2.8 Tracking Function
          9. 10.2.1.2.9 Output Filter And Loop Stability
        3. 10.2.1.3 Application Curves
    3. 10.3 System Examples
      1. 10.3.1 Regulated Power LED Supply
      2. 10.3.2 Inverting Power Supply
      3. 10.3.3 Active Output Discharge
      4. 10.3.4 Various Output Voltages
  11. 11Power Supply Recommendations
  12. 12Layout
    1. 12.1 Layout Guidelines
    2. 12.2 Layout Example
  13. 13デバイスおよびドキュメントのサポート
    1. 13.1 デバイス・サポート
      1. 13.1.1 デベロッパー・ネットワークの製品に関する免責事項
    2. 13.2 関連リンク
    3. 13.3 ドキュメントの更新通知を受け取る方法
    4. 13.4 コミュニティ・リソース
    5. 13.5 商標
    6. 13.6 静電気放電に関する注意事項
    7. 13.7 Glossary
  14. 14メカニカル、パッケージ、および注文情報

パッケージ・オプション

デバイスごとのパッケージ図は、PDF版データシートをご参照ください。

メカニカル・データ（パッケージ｜ピン）
  • RGT|16
サーマルパッド・メカニカル・データ
発注情報

10.2.1.2.8 Tracking Function

If a tracking function is desired, the SS/TR pin can be used for this purpose by connecting it to an external tracking voltage. The output voltage tracks that voltage. If the tracking voltage is between 50mV and 1.2V, the FB pin tracks the SS/TR pin voltage as described in Equation 11 and shown in Figure 11.

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Equation 11. TPS62130A-Q1 TPS62133A-Q1 TPS6213013A-Q1 SLVSAG7_eqvtrack.gif
TPS62130A-Q1 TPS62133A-Q1 TPS6213013A-Q1 SLVSAG7_TRdgr.gifFigure 11. Voltage Tracking Relationship

Once the SS/TR pin voltage reaches about 1.2V, the internal voltage is clamped to the internal feedback voltage and device goes to normal regulation. This works for rising and falling tracking voltages with the same behavior, as long as the input voltage is inside the recommended operating conditions. For decreasing SS/TR pin voltage, the device doesn't sink current from the output. So, the resulting decrease of the output voltage may be slower than the SS/TR pin voltage if the load is light. When driving the SS/TR pin with an external voltage, do not exceed the voltage rating of the SS/TR pin which is VIN+0.3V.

If the input voltage drops into undervoltage lockout or even down to zero, the output voltage will go to zero, independent of the tracking voltage. Figure 12 shows how to connect devices to get ratiometric and simultaneous sequencing by using the tracking function.

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TPS62130A-Q1 TPS62133A-Q1 TPS6213013A-Q1 SLVSCC2_TR.gifFigure 12. Sequence for Ratiometric and Simultaneous Startup

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The resistive divider of R1 and R2 can be used to change the ramp rate of VOUT2 faster, slower or the same as VOUT1.

A sequential startup is achieved by connecting the PG pin of VOUT1 to the EN pin of VOUT2. Ratiometric start up sequence happens if both supplies are sharing the same soft start capacitor. Equation 10 calculates the soft start time, though the SS/TR current has to be doubled. Details about these and other tracking and sequencing circuits are found in SLVA470.

Note: If the voltage at the FB pin is below its typical value of 0.8V, the output voltage accuracy may have a wider tolerance than specified.