JAJSHS1D July   2013  – August 2019 TPS63050 , TPS63051

PRODUCTION DATA.  

  1. 1 特長
  2. 2 アプリケーション
  3. 3 概要
    1.     Device Images
      1.      概略回路図(WCSP)
      2.      効率と出力電流との関係
  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 Switching Characteristics
    7. 8.7 Typical Characteristics
  9. 9 Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagrams
    3. 9.3 Feature Description
      1. 9.3.1 Power Good
      2. 9.3.2 Overvoltage Protection
      3. 9.3.3 Undervoltage Lockout (UVLO)
      4. 9.3.4 Thermal Shutdown
      5. 9.3.5 Soft Start
      6. 9.3.6 Short Circuit Protection
    4. 9.4 Device Functional Modes
      1. 9.4.1 Control Loop Description
      2. 9.4.2 Power Save Mode Operation
      3. 9.4.3 Adjustable Current Limit
      4. 9.4.4 Device Enable
  10. 10Application and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Application
      1. 10.2.1 Design Requirements
      2. 10.2.2 Detailed Design Procedure
        1. 10.2.2.1 Custom Design With WEBENCH® Tools
        2. 10.2.2.2 Output Filter Design
        3. 10.2.2.3 Inductor Selection
        4. 10.2.2.4 Capacitor selection
          1. 10.2.2.4.1 Input Capacitor
          2. 10.2.2.4.2 Output Capacitor
        5. 10.2.2.5 Setting the Output Voltage
      3. 10.2.3 Application Curves
  11. 11Power Supply Recommendations
  12. 12Layout
    1. 12.1 Layout Guidelines
    2. 12.2 Layout Example (WCSP)
    3. 12.3 Layout Example (HotRod)
    4. 12.4 Thermal Considerations
  13. 13デバイスおよびドキュメントのサポート
    1. 13.1 WEBENCH®ツールによるカスタム設計
    2. 13.2 デバイス・サポート
      1. 13.2.1 デベロッパー・ネットワークの製品に関する免責事項
    3. 13.3 関連リンク
    4. 13.4 ドキュメントの更新通知を受け取る方法
    5. 13.5 コミュニティ・リソース
    6. 13.6 商標
    7. 13.7 静電気放電に関する注意事項
    8. 13.8 Glossary
  14. 14メカニカル、パッケージ、および注文情報

9.4.3 Adjustable Current Limit

The TPS6305x devices have an internal user programmable current limit that monitors the input current during start-up. This prevents high inrush current protecting the device and the application. During start-up the input current does not exceed the current limit that is set by ILIM0 pin and ILIM1 pin. Depending on the logic level applied at these two pins, switching between four different current limit-levels is possible. The variation of those values over input voltage and temperature is shown in Figure 1 through Figure 2. Adjusting the soft-start time further using the soft-start capacitor is possible.

ILIM0 and ILIM1 set the current limit as listed in Table 2.

Table 2. Adjustable Current Limit

ILIM1 ILIM0 CURRENT LIMIT SET (WCSP) CURRENT LIMIT SET (HotRod)
Low Low 0.4 × IIN_MAX Not Available
Low High 0.5 × IIN_MAX Not Available
High Low 0.65 × IIN_MAX 0.65 × IIN_MAX
High High IIN_MAX IIN_MAX

The ILIM0, ILIM1 pins can be changed during operation.

Given the curves provided in Figure 1 through Figure 2, calculating the output current in the different condition in boost mode is possible using Equation 1 and Equation 2 and in buck mode using Equation 3 and Equation 4.

Equation 1. TPS63050 TPS63051 q1_boost_lvsa92.gif
Equation 2. TPS63050 TPS63051 q1_boost_lvsa92[1].gif

where

  • η = Estimated converter efficiency (use the number from the efficiency curves or 0.9 as an assumption)
  • IIN = Minimum average input current (Figure 2 to Figure 2)
Equation 3. TPS63050 TPS63051 q3_buck_lvsa92.gif
Equation 4. TPS63050 TPS63051 q1_buck_lvsa92[1].gif

where

  • For η, use the number from the efficiency curves or 0.9 as an assumption.