JAJSFU6C July   2018  – July 2019 LM5180

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

  1. 1 特長
  2. 2 アプリケーション
  3. 3 概要
    1.     Device Images
      1.      代表的なアプリケーション
      2.      標準的な効率、VOUT = 5V
  4. 4 改訂履歴
  5. 5 概要（続き）
  6. 6 Pin Configuration and Functions
    1.     Pin Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 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  Integrated Power MOSFET
      2. 8.3.2  PSR Flyback Modes of Operation
      3. 8.3.3  Setting the Output Voltage
        1. 8.3.3.1 Diode Thermal Compensation
      4. 8.3.4  Control Loop Error Amplifier
      5. 8.3.5  Precision Enable
      6. 8.3.6  Configurable Soft Start
      7. 8.3.7  External Bias Supply
      8. 8.3.8  Minimum On-Time and Off-Time
      9. 8.3.9  Overcurrent Protection
      10. 8.3.10 Thermal Shutdown
    4. 8.4 Device Functional Modes
      1. 8.4.1 Shutdown Mode
      2. 8.4.2 Standby Mode
      3. 8.4.3 Active Mode
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Applications
      1. 9.2.1 Design 1: Wide VIN, Low IQ PSR Flyback Converter Rated at 5 V, 1 A
        1. 9.2.1.1 Design Requirements
        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  Custom Design With Excel Quickstart Tool
          3. 9.2.1.2.3  Flyback Transformer – T1
          4. 9.2.1.2.4  Flyback Diode – DFLY
          5. 9.2.1.2.5  Zener Clamp Circuit – DF, DCLAMP
          6. 9.2.1.2.6  Output Capacitor – COUT
          7. 9.2.1.2.7  Input Capacitor – CIN
          8. 9.2.1.2.8  Feedback Resistor – RFB
          9. 9.2.1.2.9  Thermal Compensation Resistor – RTC
          10. 9.2.1.2.10 UVLO Resistors – RUV1, RUV2
          11. 9.2.1.2.11 Soft-Start Capacitor – CSS
        3. 9.2.1.3 Application Curves
      2. 9.2.2 Design 2: PSR Flyback Converter With Dual Outputs of 15 V and –7.7 V at 200 mA
        1. 9.2.2.1 Design Requirements
        2. 9.2.2.2 Detailed Design Procedure
          1. 9.2.2.2.1 Flyback Transformer – T1
          2. 9.2.2.2.2 Flyback Diodes – DFLY1 and DFLY2
          3. 9.2.2.2.3 Input Capacitor – CIN
          4. 9.2.2.2.4 Feedback Resistor – RFB
          5. 9.2.2.2.5 UVLO Resistors – RUV1, RUV2
        3. 9.2.2.3 Application Curves
      3. 9.2.3 Design 3: PSR Flyback Converter With Stacked Dual Outputs of 24 V and 5 V
        1. 9.2.3.1 Design Requirements
        2. 9.2.3.2 Detailed Design Procedure
          1. 9.2.3.2.1 Flyback Transformer – T1
          2. 9.2.3.2.2 Feedback Resistor – RFB
          3. 9.2.3.2.3 UVLO Resistors – RUV1, RUV2
        3. 9.2.3.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Examples
  12. 12デバイスおよびドキュメントのサポート
    1. 12.1 デバイス・サポート
      1. 12.1.1 デベロッパー・ネットワークの製品に関する免責事項
      2. 12.1.2 開発サポート
      3. 12.1.3 WEBENCH® ツールによるカスタム設計
    2. 12.2 ドキュメントのサポート
      1. 12.2.1 関連資料
    3. 12.3 ドキュメントの更新通知を受け取る方法
    4. 12.4 コミュニティ・リソース
    5. 12.5 商標
    6. 12.6 静電気放電に関する注意事項
    7. 12.7 Glossary
  13. 13メカニカル、パッケージ、および注文情報

9.2.1.3 Application Curves

Unless otherwise stated, application performance curves were taken at TA = 25°C.

LM5180 D002_snvu592.gif
Figure 24. Efficiency (Linear Scale)
LM5180 D004_snvu592.gif
Figure 26. Load Regulation (Linear Scale)
LM5180 Fsw_plot_design1_nvsb06.gif
Figure 28. Switching Frequency Over Load and Line
LM5180 LM5180_design1_ENstartup_waveform_nvsb06.gif
VIN = 24 V 5-Ω Load
Figure 30. Enable ON Characteristic
LM5180 LM5180_design1_SWnode24Vin_waveform_nvsb06.gif
VIN = 24 V IOUT = 1 A
Figure 32. SW Node Voltage
LM5180 LM5180_design1_Diode24Vin_waveform_nvsb06.gif
VIN = 24 V IOUT = 1 A
Figure 34. Flyback Diode Voltage
LM5180 CISPR25_24V_LF_design1_nvsb06.gif
VIN = 24 V
IOUT = 0.85 A		 150 kHz to 30 MHz LIN = 4.7 µH
CIN = 10 µF
Figure 36. CISPR 25 Class 5 Conducted EMI Plot
LM5180 D001_snvu592.gif
Figure 25. Efficiency (Log Scale)
LM5180 D003_snvu592.gif
Figure 27. Load Regulation (Log Scale)
LM5180 LM5180_design1_24Vstartup_waveform_nvsb06.gif
VIN stepped to 24 V 5-Ω Load
Figure 29. Start-up Characteristic
LM5180 LM5180_design1_SCrecovery_waveform_nvsb06.gif
VIN stepped to 48 V 5-Ω Load
Figure 31. Short Circuit Recovery
LM5180 LM5180_design1_SWnode48Vin_waveform_nvsb06.gif
VIN = 48 V IOUT = 1 A
Figure 33. SW Node Voltage
LM5180 LM5180_design1_Diode48Vin_waveform_nvsb06.gif
VIN = 48 V IOUT = 1 A
Figure 35. Flyback Diode Voltage
LM5180 CISPR25_24V_HF_design1_nvsb06.gif
VIN = 24 V
IOUT = 0.85 A		 30 MHz to 108 MHz LIN = 4.7 µH
CIN = 10 µF
Figure 37. CISPR 25 Class 5 Conducted EMI Plot