JAJSH55A march   2019  – august 2021 TL7700-SEP

PRODUCTION DATA  

  1.   1
  2. 1 特長
  3. 2 アプリケーション
  4. 3 概要
  5. 4 Revision History
  6. 5 Pin Configuration and Functions
  7. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Switching Characteristics
    7. 6.7 Typical Characteristics
  8. 7 Parameter Measurement Information
  9. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Sense-Voltage Setting
      2. 8.3.2 Sense-Voltage Hysteresis Setting
      3. 8.3.3 Output Pulse-Duration Setting
    4. 8.4 Device Functional Modes
  10. 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
      3. 9.2.3 Application Curve
  11. 10Power Supply Recommendations
  12. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  13. 12Device and Documentation Support
    1. 12.1 ドキュメントの更新通知を受け取る方法
    2. 12.2 サポート・リソース
    3. 12.3 Trademarks
    4. 12.4 静電気放電に関する注意事項
    5. 12.5 用語集
  14. 13Mechanical, Packaging, and Orderable Information

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 Detailed Design Procedure

The SENSE terminal input voltage, Vs, for TL7700-SEP is typically 500 mV. By using two external resistors, any sense voltage over 500 mV can be sensed.

Resistor R1 should be selected first to set the desired hysteresis. Section 8.3.2 provides detailed information on how to set the hysteresis. For this application, a 240-kΩ resistor is selected.

Equation 4. V h y s =   I s × R 1
Equation 5. V h y s =   2.5   µ A × 240   k Ω = 0.6   V

Resistor R2 should then be selected based on the R1 value and the desired sense voltage (Vs'). Section 8.3.1 describes how to set Vs' and provides and equation. In this example, Vs' is set to 4.5 V by using the value of R1 selected earlier and using a 30-kΩ resistor for R2.

Equation 6. V s ' =   V s × ( R 1 + R 2 ) R 2
Equation 7. V s ' =   0.5   V × ( 240   k Ω + 30   k Ω ) 30   k Ω = 4.5   V

Finally, the output pulse duration (tPO) is set using the equation found in Section 8.3.3.

Equation 8. t p o = C T   Δ V C T I C T
Equation 9. t p o = 510   p F   1.5   V 15   µ A =   51   µ s