JAJS843E April   1998  – June 2019 LM2588

PRODUCTION DATA.  

  1. 1 特長
  2. 2 代表的なアプリケーション
  3. 3 概要
    1.     Device Images
      1.      フライバック・レギュレータ
  4. 4 改訂履歴
  5. 5 概要（続き）
  6. 6 Pin Configurations
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Ratings
    4. 7.4 Electrical Characteristics: 3.3 V
    5. 7.5 Electrical Characteristics: 5 V
    6. 7.6 Electrical Characteristics: 12 V
    7. 7.7 Electrical Characteristics: Adjustable
    8. 7.8 Electrical Characteristics: All Output Voltage Versions
    9. 7.9 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 Flyback Regulator Operation
      2. 8.3.2 Step-Up (Boost) Regulator Operation
      3. 8.3.3 Shutdown Control
      4. 8.3.4 Frequency Adjustment
      5. 8.3.5 Frequency Synchronization
      6. 8.3.6 Programming Output Voltage (Selecting R1 And R2)
      7. 8.3.7 Short-Circuit Condition
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Applications
      1. 9.2.1 Typical Flyback Regulator Applications
        1. 9.2.1.1 Design Requirements
          1. 9.2.1.1.1 Transformer Selection (T)
          2. 9.2.1.1.2 Transformer Footprints
        2. 9.2.1.2 Detailed Design Procedure
          1. 9.2.1.2.1 Custom Design With WEBENCH® Tools
          2. 9.2.1.2.2 Flyback Regulator Input Capacitors
          3. 9.2.1.2.3 Switch Voltage Limits
          4. 9.2.1.2.4 Output Voltage Limitations
          5. 9.2.1.2.5 Noisy Input Line Condition
          6. 9.2.1.2.6 Stability
      2. 9.2.2 Typical Boost Regulator Applications
        1. 9.2.2.1 Design Requirements
        2. 9.2.2.2 Detailed Design Procedure
    3. 9.3 System Examples
      1. 9.3.1 Test Circuits
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
    3. 10.3 Heat Sink/Thermal Considerations
  11. 11デバイスおよびドキュメントのサポート
    1. 11.1 デバイス・サポート
      1. 11.1.1 デベロッパー・ネットワークの製品に関する免責事項
      2. 11.1.2 開発サポート
        1. 11.1.2.1 WEBENCH®ツールによるカスタム設計
    2. 11.2 ドキュメントの更新通知を受け取る方法
    3. 11.3 コミュニティ・リソース
    4. 11.4 商標
    5. 11.5 静電気放電に関する注意事項
    6. 11.6 Glossary
  12. 12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

8.3.3 Shutdown Control

A feature of the LM2588 is its ability to be shut down using the ON /OFF pin (pin 1). This feature conserves input power by turning off the device when it is not in use. For proper operation, an isolation diode is required (as shown in Figure 20).

The device will shut down when 3 V or greater is applied on the ON /OFF pin, sourcing current into pin 1. In shut down mode, the device draws typically 56 μA of supply current (16 μA to VIN and 40 μA to the ON /OFF pin). To turn the device back on, leave pin 1 floating, using an (isolation) diode, as shown in Figure 20 (for normal operation, do not source or sink current to or from this pin—see the next section).

LM2588 01242054.pngFigure 20. Shutdown Operation