ZHCSJ07A November   2018  – July 2019 LM25180

ADVANCE INFORMATION for pre-production products; subject to change without notice.  

1. 1 特性
2. 2 應(yīng)用
3. 3 說明
   1.     Device Images
      1.      典型應(yīng)用
      2.      典型效率 (VOUT = 5V)
4. 4 修訂歷史記錄
5. 5 Pin Configuration and Functions
   1.     Pin 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 Typical Characteristics
7. 7 Detailed Description
   1. 7.1 Overview
   2. 7.2 Functional Block Diagram
   3. 7.3 Feature Description
      1. 7.3.1  Integrated Power MOSFET
      2. 7.3.2  PSR Flyback Modes of Operation
      3. 7.3.3  Setting the Output Voltage
         1. 7.3.3.1 Diode Thermal Compensation
      4. 7.3.4  Control Loop Error Amplifier
      5. 7.3.5  Precision Enable
      6. 7.3.6  Configurable Soft Start
      7. 7.3.7  External Bias Supply
      8. 7.3.8  Minimum On-Time and Off-Time
      9. 7.3.9  Overcurrent Protection
      10. 7.3.10 Thermal Shutdown
   4. 7.4 Device Functional Modes
      1. 7.4.1 Shutdown Mode
      2. 7.4.2 Standby Mode
      3. 7.4.3 Active Mode
8. 8 Application and Implementation
   1. 8.1 Application Information
   2. 8.2 Typical Applications
      1. 8.2.1 Design 1: Wide VIN, Low IQ PSR Flyback Converter Rated at 5 V, 1 A
         1. 8.2.1.1 Design Requirements
         2. 8.2.1.2 Detailed Design Procedure
            1. 8.2.1.2.1  Custom Design With WEBENCH® Tools
            2. 8.2.1.2.2  Custom Design With Excel Quickstart Tool
            3. 8.2.1.2.3  Flyback Transformer – T1
            4. 8.2.1.2.4  Flyback Diode – DFLY
            5. 8.2.1.2.5  Zener Clamp Circuit – DF, DCLAMP
            6. 8.2.1.2.6  Output Capacitor – COUT
            7. 8.2.1.2.7  Input Capacitor – CIN
            8. 8.2.1.2.8  Feedback Resistor – RFB
            9. 8.2.1.2.9  Thermal Compensation Resistor – RTC
            10. 8.2.1.2.10 UVLO Resistors – RUV1, RUV2
            11. 8.2.1.2.11 Soft-Start Capacitor – CSS
         3. 8.2.1.3 Application Curves
      2. 8.2.2 Design 2: PSR Flyback Converter With Dual Outputs of 15 V and –7.7 V at 200 mA
         1. 8.2.2.1 Design Requirements
         2. 8.2.2.2 Detailed Design Procedure
            1. 8.2.2.2.1 Flyback Transformer – T1
            2. 8.2.2.2.2 Flyback Diodes – DFLY1 and DFLY2
            3. 8.2.2.2.3 Input Capacitor – CIN
            4. 8.2.2.2.4 Feedback Resistor – RFB
            5. 8.2.2.2.5 UVLO Resistors – RUV1, RUV2
         3. 8.2.2.3 Application Curves
      3. 8.2.3 Design 3: PSR Flyback Converter With Stacked Dual Outputs of 24 V and 5 V
         1. 8.2.3.1 Design Requirements
         2. 8.2.3.2 Detailed Design Procedure
            1. 8.2.3.2.1 Flyback Transformer – T1
            2. 8.2.3.2.2 Feedback Resistor – RFB
            3. 8.2.3.2.3 UVLO Resistors – RUV1, RUV2
         3. 8.2.3.3 Application Curves
9. 9 Power Supply Recommendations
10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Examples
11. 11器件和文檔支持
    1. 11.1 器件支持
       1. 11.1.1 第三方產(chǎn)品免責(zé)聲明
       2. 11.1.2 開發(fā)支持
       3. 11.1.3 使用 WEBENCH® 工具定制設(shè)計方案
    2. 11.2 文檔支持
       1. 11.2.1 相關(guān)文檔
    3. 11.3 接收文檔更新通知
    4. 11.4 社區(qū)資源
    5. 11.5 商標(biāo)
    6. 11.6 靜電放電警告
    7. 11.7 Glossary
12. 12"機(jī)械、封裝和可訂購信息