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

7.6 Typical Characteristics

VIN = 24 V, VEN/UVLO = 2 V (unless otherwise stated).
LM5180 D002_snvu592.gif
See Figure 23
Figure 1. Efficiency vs. Load
LM5180 LM5180_design1_SWnode24Vin_waveform_nvsb06.gif
See Figure 23 IOUT = 1 A
Figure 3. Primary-side Switching Waveform in BCM
LM5180 LM5180_design1_24Vstartup_waveform_nvsb06.gif
See Figure 23
Figure 5. Startup Characteristic
LM5180 D002_ActiveIQ_vs_temp_nvsb06.gif
Figure 7. Active Quiescent Current vs. Temperature
LM5180 D004_RsetvsVIN.gif
Figure 9. RSET Current vs. Input Voltage
LM5180 D006_TCvoltage_vs_temp.gif
Figure 11. TC Voltage vs. Temperature
LM5180 D008_EnUVLOHysteresiscurrent_vs_temp.gif
Figure 13. EN/UVLO Hysteresis Current vs. Temperature
LM5180 D010_ILIM_vs_temp.gif
Figure 15. Switch Peak Current Limits vs. Temperature
LM5180 D012_minswitchfreq_vs_temp.gif
Figure 17. Minimum Switching Frequency vs. Temperature
LM5180 D004_snvu592.gif
See Figure 23
Figure 2. Output Voltage vs. Load
LM5180 LM5180_design1_SWnode48Vin_waveform_nvsb06.gif
See Figure 23 VIN = 48 V, IOUT = 1 A
Figure 4. Primary-side Switching Waveform in DCM
LM5180 D001_shutdownIQvsTemp_nvsb29.gif
Figure 6. Shutdown Quiescent Current vs. Temperature
LM5180 D003_ActiveIQwBias_vs_temp_nvsb06.gif
VSS/BIAS = 6 V
Figure 8. Active Quiescent Current with BIAS vs. Temperature
LM5180 D005_RsetvsTemp.gif
Figure 10. RSET Current vs. Temperature
LM5180 D007_ENThresholdRiseFall_vs_temp.gif
Figure 12. EN/UVLO Threshold Voltages vs. Temperature
LM5180 D009_Rdson_vs_temp.gif
Figure 14. MOSFET RDS(on) vs. Temperature
LM5180 D011_minontime_vs_temp.gif
Figure 16. Minimum Switch On-Time vs. Temperature
LM5180 D013_maxswitchfreq_vs_temp.gif
Figure 18. Maximum Switching Frequency vs. Temperature