SNVU738 March   2022 LM5157 , LM5157-Q1 , LM51571-Q1

 

  1.   Trademarks
  2. 1Features and Electrical Performance
    1. 1.1 Electrical Parameters
    2. 1.2 EVM Power Derating Curve
    3. 1.3 Terminals and Signal Test Points
  3. 2Application Schematic
  4. 3EVM Picture
  5. 4Test Setup and Procedure
    1. 4.1 Bench Setup
    2. 4.2 Test Equipment
    3. 4.3 Precautions
  6. 5Test Data
    1. 5.1 Efficiency
    2. 5.2 Output Regulation
    3. 5.3 Thermal Performance
    4. 5.4 Typical Power Up
    5. 5.5 Output Ripple Voltage
    6. 5.6 Step Load Response
    7. 5.7 Bode Plots
  7. 6Schematics
  8. 7Bill of Materials
  9. 8Board Layout

1 Features and Electrical Performance

The LM5157EVM-SEPIC supports the following features and performance capabilities:

  • Wide input voltage range from 4 V to 32 V, to cover typical automotive battery voltage ranges
  • Tightly regulated output voltage of 12 V with a 1% accurate reference voltage
  • Supports 1 A full load when VIN is greater than 6 V
  • Supports 0.5 A load current when VIN drops to 4 V
  • 2.1 MHz switching frequency
  • Peak efficiency > 88 %
  • Can be used to evaluate LM51571-Q1, LM5157-Q1, and LM51571 ICs, by replacing the factory installed IC with the corresponding IC
  • Selection capability for several BIAS connections

The electrical performance of the EVM is show in Table 1-1. The EVM terminals and signal test points are listed in Table 1-2. The typical application circuit is shown in Figure 2-1. The EVM complete schematic is shown in Figure 6-1.