JAJSEU1B November   2017  – May 2018 TPS62821 , TPS62822 , TPS62823

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 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Enable / Shutdown and Output Discharge
      2. 8.3.2 Soft-Start
      3. 8.3.3 Power Good (PG)
      4. 8.3.4 Undervoltage Lockout (UVLO)
      5. 8.3.5 Thermal Shutdown
    4. 8.4 Device Functional Modes
      1. 8.4.1 Pulse Width Modulation (PWM) Operation
      2. 8.4.2 Power Save Mode (PSM) Operation
      3. 8.4.3 Minimum Duty Cycle and 100% Mode Operation
      4. 8.4.4 Current Limit and Short Circuit Protection
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 Custom Design With WEBENCH® Tools
        2. 9.2.2.2 Setting the Adjustable Output Voltage
        3. 9.2.2.3 Output Filter Selection
        4. 9.2.2.4 Inductor Selection
        5. 9.2.2.5 Output Capacitor Selection
        6. 9.2.2.6 Input Capacitor Selection
        7. 9.2.2.7 Feed-forward Capacitor Selection
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12デバイスおよびドキュメントのサポート
    1. 12.1 デバイス・サポート
      1. 12.1.1 デベロッパー・ネットワークの製品に関する免責事項
    2. 12.2 関連リンク
    3. 12.3 ドキュメントの更新通知を受け取る方法
    4. 12.4 コミュニティ・リソース
    5. 12.5 商標
    6. 12.6 静電気放電に関する注意事項
    7. 12.7 Glossary
  13. 13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

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

9.2.2.4 Inductor Selection

The TPS6282x is designed to work with inductors of 470nH nominal and can be used with 1µH inductors as well. The inductor has to be selected for adequate saturation current and a low dc resistance (DCR). The minimum inductor current rating, that is needed under static load conditions is calculated using Equation 6 and Equation 7.

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Equation 6. TPS62821 TPS62822 TPS62823 SLVSDV6_eqILmin.gif

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Equation 7. TPS62821 TPS62822 TPS62823 SLVSDV6_eqdeltaIL.gif

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This calculation gives the minimum saturation current of the inductor needed and an additional margin is recommended to cover dynamic overshoot due to startup or load transients. Inductors are available in different dimensions. Choosing the smallest size might result in less efficiency due to larger DCR and ac losses. The following inductors have been tested with the TPS6282x:

Table 5. List of Recommended Inductors

TYPE Nominal INDUCTANCE (1) Saturation Current and DC Resistance Dimensions [mm] Manufacturer(3)
max. ISAT [A](2) max. RDC [mΩ]
HTEN20161T-R47MDR 0.47 4.8 32 2.0 x 1.6 x 1.0 Cyntec
HTEH20121T-R47MSR 0.47 4.6 25 2.0 x 1.2 x 1.0 Cyntec
DFE201610E - R47M 0.47 4.8 32 2.0 x 1.6 x 1.0 muRata
DFE201210S - R47M 0.47 4.8 32 2.0 x 1.2 x 1.0 muRata
TFM201610ALM-R47MTAA 0.47 5.1 34 2.0 x 1.6 x 1.0 TDK
TFM201610ALC-R47MTAA 0.47 5.2 25 2.0 x 1.6 x 1.0 TDK
XFL4015-471ME 0.47 6.6 8.36 4.0 x 4.0 x 1.6 Coilcraft
(1) Inductance Tolerance ±20%
(2) ΔL/L≈30%
(3) See Third-party Products disclaimer.