SNVSB79B November   2018  – May 2020 LM25180

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 Description (continued)
  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. 12Device and Documentation Support
    1. 12.1 Device Support
      1. 12.1.1 Third-Party Products Disclaimer
      2. 12.1.2 Development Support
      3. 12.1.3 Custom Design With WEBENCH® Tools
    2. 12.2 Documentation Support
      1. 12.2.1 Related Documentation
    3. 12.3 Receiving Notification of Documentation Updates
    4. 12.4 Support Resources
    5. 12.5 Trademarks
    6. 12.6 Electrostatic Discharge Caution
    7. 12.7 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • NGU|8
Thermal pad, mechanical data (Package|Pins)
Orderable Information

7.6 Typical Characteristics

VIN = 24 V, VEN/UVLO = 2 V (unless otherwise stated).
LM25180 D020_snvsb06.gif
See Figure 23
Figure 1. Efficiency versus Load
LM25180 LM5180_design1_SWnode24Vin_waveform_nvsb06.gif
See Figure 23 IOUT = 1 A
Figure 3. Primary-side Switching Waveform in BCM
LM25180 LM5180_design1_24Vstartup_waveform_nvsb06.gif
See Figure 23
Figure 5. Start-up Characteristic
LM25180 D002_ActiveIQ_vs_temp_LV_nvsb06.gif
Figure 7. Active Quiescent Current versus Temperature
LM25180 D004_RsetvsVIN_LV.gif
Figure 9. RSET Current versus Input Voltage
LM25180 D006_TCvoltage_vs_temp.gif
Figure 11. TC Voltage versus Temperature
LM25180 D008_EnUVLOHysteresiscurrent_vs_temp.gif
Figure 13. EN/UVLO Hysteresis Current versus Temperature
LM25180 D010_ILIM_vs_temp.gif
Figure 15. Switch Peak Current Limits versus Temperature
LM25180 D012_minswitchfreq_vs_temp.gif
Figure 17. Minimum Switching Frequency versus Temperature
LM25180 D022_snvsb06.gif
See Figure 23
Figure 2. Output Voltage versus Load
LM25180 LM5180_design1_Diode24Vin_waveform_nvsb06.gif
See Figure 23 IOUT = 1 A
Figure 4. Flyback Diode Switching Waveform in BCM
LM25180 D001_shutdownIQvsTemp_LV_nvsb29.gif
Figure 6. Shutdown Quiescent Current versus Temperature
LM25180 D003_ActiveIQwBias_vs_temp_LV_nvsb06.gif
VSS/BIAS = 6 V
Figure 8. Active Quiescent Current with BIAS versus Temperature
LM25180 D005_RsetvsTemp.gif
Figure 10. RSET Current versus Temperature
LM25180 D007_ENThresholdRiseFall_vs_temp.gif
Figure 12. EN/UVLO Threshold Voltages versus Temperature
LM25180 D009_Rdson_vs_temp.gif
Figure 14. MOSFET RDS(on) versus Temperature
LM25180 D011_minontime_vs_temp.gif
Figure 16. Minimum Switch On-Time versus Temperature
LM25180 D013_maxswitchfreq_vs_temp.gif
Figure 18. Maximum Switching Frequency versus Temperature