SNVSB07C July   2018  – April 2019 LM5180-Q1

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      Typical Application
      2.      Typical Efficiency, VOUT = 5 V
  4. 4 Revision History
  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. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Third-Party Products Disclaimer
      2. 11.1.2 Development Support
      3. 11.1.3 Custom Design With WEBENCH® Tools
    2. 11.2 Documentation Support
      1. 11.2.1 Related Documentation
    3. 11.3 Receiving Notification of Documentation Updates
    4. 11.4 Community Resources
    5. 11.5 Trademarks
    6. 11.6 Electrostatic Discharge Caution
    7. 11.7 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

8.2.1.3 Application Curves

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

LM5180-Q1 D002_snvu592.gif
Figure 24. Efficiency (Linear Scale)
LM5180-Q1 D004_snvu592.gif
Figure 26. Load Regulation (Linear Scale)
LM5180-Q1 Fsw_plot_design1_nvsb06.gif
Figure 28. Switching Frequency Over Load and Line
LM5180-Q1 LM5180_design1_ENstartup_waveform_nvsb06.gif
VIN = 24 V 5-Ω Load
Figure 30. Enable ON Characteristic
LM5180-Q1 LM5180_design1_SWnode24Vin_waveform_nvsb06.gif
VIN = 24 V IOUT = 1 A
Figure 32. SW Node Voltage
LM5180-Q1 LM5180_design1_Diode24Vin_waveform_nvsb06.gif
VIN = 24 V IOUT = 1 A
Figure 34. Flyback Diode Voltage
LM5180-Q1 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-Q1 D001_snvu592.gif
Figure 25. Efficiency (Log Scale)
LM5180-Q1 D003_snvu592.gif
Figure 27. Load Regulation (Log Scale)
LM5180-Q1 LM5180_design1_24Vstartup_waveform_nvsb06.gif
VIN stepped to 24 V 5-Ω Load
Figure 29. Start-up Characteristic
LM5180-Q1 LM5180_design1_SCrecovery_waveform_nvsb06.gif
VIN stepped to 48 V 5-Ω Load
Figure 31. Short Circuit Recovery
LM5180-Q1 LM5180_design1_SWnode48Vin_waveform_nvsb06.gif
VIN = 48 V IOUT = 1 A
Figure 33. SW Node Voltage
LM5180-Q1 LM5180_design1_Diode48Vin_waveform_nvsb06.gif
VIN = 48 V IOUT = 1 A
Figure 35. Flyback Diode Voltage
LM5180-Q1 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