ZHCS527G January   2007  – April 2025 LM5574

PRODUCTION DATA  

  1.   1
  2. 1 特性
  3. 2 应用
  4. 3 说明
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 High Voltage Start-Up Regulator
      2. 6.3.2 Oscillator and Sync Capability
      3. 6.3.3 Error Amplifier and PWM Comparator
      4. 6.3.4 Ramp Generator
      5. 6.3.5 Maximum Duty Cycle, Input Dropout Voltage
      6. 6.3.6 Current Limit
      7. 6.3.7 Soft Start
      8. 6.3.8 Boost Pin
      9. 6.3.9 Thermal Protection
    4. 6.4 Device Functional Modes
  8. 7 Application and Implementation
    1. 7.1 Application Information
    2. 7.2 Typical Application
      1. 7.2.1 Design Requirements
      2. 7.2.2 Detailed Design Procedure
        1. 7.2.2.1  Custom Design With WEBENCH® Tools
        2. 7.2.2.2  External Components
        3. 7.2.2.3  R3 (R)T
        4. 7.2.2.4  L1-Inductor
        5. 7.2.2.5  C3 (C)RAMP
        6. 7.2.2.6  C9-Output Capacitor
        7. 7.2.2.7  D1-Async Diode
        8. 7.2.2.8  C1-Input Capacitor
        9. 7.2.2.9  C8-VCC Capacitor
        10. 7.2.2.10 C7-BST Capacitor
        11. 7.2.2.11 C4- SS Capacitor
        12. 7.2.2.12 R5, R6- Feedback Resistors
        13. 7.2.2.13 R1, R2, C2-SD Pin Components
        14. 7.2.2.14 R4, C5, C6-Compensation Components
        15. 7.2.2.15 Bias Power Dissipation Reduction
      3. 7.2.3 Application Curves
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
      2. 7.4.2 Layout Example
      3. 7.4.3 Power Dissipation
      4. 7.4.4 Thermal Considerations
  9. 8 Device and Documentation Support
    1. 8.1 Device Support
      1. 8.1.1 第三方产品免责声明
      2. 8.1.2 Development Support
        1. 8.1.2.1 Custom Design With WEBENCH® Tools
    2. 8.2 Documentation Support
      1. 8.2.1 Related Documentation
    3. 8.3 接收文档更新通知
    4. 8.4 支持资源
    5. 8.5 Trademarks
    6. 8.6 静电放电警告
    7. 8.7 术语表
  10. 9 Revision History
  11. 10Mechanical, 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

7.2.2.2 External Components

The procedure for calculating the external components is shown with the following design example. The following table lists the bill of materials for this design.

Table 7-1 5V, 0.5A Demo Board Bill of Materials
ITEM PART NUMBER DESCRIPTION VALUE
C 1 C3225X7R2A105M CAPACITOR, CER, TDK 1µ, 100V
C 2 OPEN NOT USED
C 3 C0805A471K1GAC CAPACITOR, CER, KEMET 470p, 100V
C 4 C2012X7R2A103K CAPACITOR, CER, TDK 0.01µ, 100V
C 5 C2012X7R2A223K CAPACITOR, CER, TDK 0.022µ, 100V
C 6 OPEN NOT USED
C 7 C2012X7R2A223K CAPACITOR, CER, TDK 0.022µ, 100V
C 8 C2012X7R1C474M CAPACITOR, CER, TDK 0.47µ, 16V
C 9 C3225X7R1C226M CAPACITOR, CER, TDK 22µ, 16V
D 1 CMSH2-100M DIODE, 100V, CENTRAL
L 1 DR74-101 INDUCTOR, COOPER 100µH
R 1 OPEN NOT USED
R 2 OPEN NOT USED
R 3 CRCW08052102F RESISTOR 21kΩ
R 4 CRCW08052492F RESISTOR 24.9kΩ
R 5 CRCW08055111F RESISTOR 5.11kΩ
R 6 CRCW08051651F RESISTOR 1.65kΩ
U 1 LM5574 REGULATOR, TEXAS INSTRUMENTS