SNVSBT4A August   2023  – November 2023 LM5185-Q1

PRODUCTION DATA  

  1.   1
  2. Features
  3. Applications
  4. Description
  5. Description (continued)
  6. Pin Configuration and Functions
  7. 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
  8. Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  Power MOSFET Gate Driver
      2. 7.3.2  PSR Flyback Modes of Operation
      3. 7.3.3  High Voltage VCC Regulator
      4. 7.3.4  Setting the Output Voltage
        1. 7.3.4.1 Diode Thermal Compensation
      5. 7.3.5  Control Loop Error Amplifier
      6. 7.3.6  Precision Enable
      7. 7.3.7  Configurable Soft Start
      8. 7.3.8  Minimum On-Time and Off-Time
      9. 7.3.9  Current Sensing and 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
  9. 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 16.4 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 and Current-Sense Resistor (RCS)
          4. 8.2.1.2.4  Flyback Diode – DFLY
          5. 8.2.1.2.5  Leakage Inductance Clamp Circuit – DF, DCLAMP
          6. 8.2.1.2.6  Feedback Resistor – RFB
          7. 8.2.1.2.7  Thermal Compensation Resistor – RTC
          8. 8.2.1.2.8  UVLO Resistors – RUV1, RUV2
          9. 8.2.1.2.9  Soft-Start Capacitor – CSS
          10. 8.2.1.2.10 Compensation Components
        3. 8.2.1.3 Application Curves
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Examples
  10. Device and Documentation Support
    1. 9.1 Device Support
      1. 9.1.1 Development Support
        1. 9.1.1.1 Custom Design With WEBENCH® Tools
    2. 9.2 Documentation Support
      1. 9.2.1 Related Documentation
    3. 9.3 Receiving Notification of Documentation Updates
    4. 9.4 Support Resources
    5. 9.5 Trademarks
    6. 9.6 Electrostatic Discharge Caution
    7. 9.7 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

Package Options

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

Typical Characteristics

VIN = 24 V (unless otherwise stated).

GUID-20230717-SS0I-2MJS-19HH-XHSLTMWFK9KD-low.svgFigure 6-1 Efficiency versus Load
GUID-20231016-SS0I-CVD6-LKF9-RHGD19BL2ZKN-low.svg
Figure 6-3 Shutdown Quiescent Current vs. Temperature
GUID-20231016-SS0I-ZZRK-VJXH-MTTNFSK8N8C0-low.svg
Figure 6-5 Active Quiescent Current with External VCC vs. Temperature
GUID-20231016-SS0I-0VZM-3W6Q-Q7V09C5RBHV0-low.svgFigure 6-7 TC Voltage versus Temperature
GUID-20231016-SS0I-HMKH-T9L4-DTD6XVDKRDSS-low.svgFigure 6-9 EN/UVLO Hysteresis Current versus Temperature
GUID-20231016-SS0I-BPRN-3SJP-CKTL54QW2WTB-low.svgFigure 6-11 Minimum Switch On-Time versus Temperature
GUID-20231016-SS0I-W0FN-VQXK-TSBMXVX1FSKK-low.svgFigure 6-13 Maximum Switching Frequency versus Temperature
GUID-20230717-SS0I-W6FD-TX2M-B3ZHMDG71XJ4-low.svgFigure 6-2 Output Voltage versus Load
GUID-20231016-SS0I-KV6F-QTDG-9QN5RTJLQ18H-low.svg
Figure 6-4 Active Quiescent Current vs. Temperature
GUID-20231016-SS0I-86XQ-NFTT-CCN556DPS2XM-low.svgFigure 6-6 RSET Current versus Temperature
GUID-20231016-SS0I-ZJN5-KQM7-QLMTXPFCDBQD-low.svgFigure 6-8 EN/UVLO Threshold Voltages versus Temperature
GUID-20231016-SS0I-JLSK-KQLL-3GJ6PRF7NDR8-low.svg
Figure 6-10 Peak Current Limit Thresholds vs. Temperature
GUID-20231016-SS0I-JQZT-10PV-HQDW7QTBH0QZ-low.svgFigure 6-12 Minimum Switching Frequency versus Temperature