SNVU628 February   2020 LM5155 , LM5155-Q1 , LM51551 , LM51551-Q1

 

  1.   LM5155EVM-SEPIC User's Guide
    1.     Trademarks
    2. 1 Features and Electrical Performance
      1. 1.1 Electrical Parameters
      2. 1.2 EVM Power Derating Curve
      3. 1.3 Terminals and Signal Test Points
    3. 2 Application Schematic
    4. 3 EVM Picture
    5. 4 Test Setup and Procedure
      1. 4.1 Bench Setup
      2. 4.2 Test Equipment
      3. 4.3 Precautions
    6. 5 Test Data
      1. 5.1 Efficiency
      2. 5.2 Output Regulation
      3. 5.3 Typical Power Up
      4. 5.4 Output Ripple Voltage
      5. 5.5 Coupled Inductor Currents
      6. 5.6 Dynamic DIR Change
      7. 5.7 Step Load Response
      8. 5.8 Bode Plots
      9. 5.9 Overloading Hiccup Mode
    7. 6 Design Files
      1. 6.1 Schematics
      2. 6.2 Bill of Materials
      3. 6.3 Board Layout

1 Features and Electrical Performance

The LM5155EVM-SEPIC supports the following features and performance capabilities:

  • Wide input voltage range from 3 V to 42 V, to cover typical automotive battery voltage ranges including cold cranking and load dump transients
  • Optimized for input voltage range from 6 V to 18 V
  • Tightly regulated output voltage of 12 V with a 1% accurate reference voltage
  • Supports 2 A full load when VIN is greater than 5 V
  • Supports 0.8 A load current when VIN drops to 3 V
  • 2.2 MHz switching frequency
  • Peak efficiency > 88%
  • Can evaluate LM51551-Q1, LM5155, and LM51551 ICs, by replacing the factory installed IC with the corresponding IC
  • Hiccup mode for output over current protection (applicable only with LM51551 and LM51551-Q1)

The electrical performance of the EVM is show in Table 1. The EVM terminals and signal test points are listed in Table 2. The typical application circuit is shown in Figure 2. The EVM complete schematic is shown in Figure 19.