ZHCSJJ4A march   2019  – august 2021 TL7700-SEP

PRODUCTION DATA  

  1. 1 特性
  2. 2 应用
  3. 3 说明
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 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
  7. 7 Parameter Measurement Information
  8. 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
  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
      3. 9.2.3 Application Curve
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 接收文档更新通知
    2. 12.2 支持资源
    3. 12.3 Trademarks
    4. 12.4 静电放电警告
    5. 12.5 术语表
  13. 13Mechanical, Packaging, and Orderable Information

封装选项

机械数据 (封装 | 引脚)
散热焊盘机械数据 (封装 | 引脚)
订购信息

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