SLVUBU5A May   2020  – December 2020 LM7481-Q1

 

  1.   Trademarks
  2. 1Introduction
    1. 1.1 Features
    2. 1.2 Applications
  3. 2Description
    1. 2.1  Input Power and Load (J1/J3 and J2/J4):
    2. 2.2  Enable Control (J5):
    3. 2.3  Over Voltage Protection (J6):
    4. 2.4  Input Voltage Monitor (J10 and VIN_MON):
    5. 2.5  Two Back-Back Connected MOSFETs (Q1/Q3 and Q2/Q4):
    6. 2.6  Output Slew Rate Control (R2 and C4):
    7. 2.7  Output Schottky Diode (D2) and LED Indication:
    8. 2.8  TVS Selection for 12-V Battery Protection:
    9. 2.9  TVS Selection for 24-V Battery Protection:
    10. 2.10 RC Input Snubber Option (R7 and C15):
    11. 2.11 Optional LC Filter at the Output (L2 and C11):
    12. 2.12 Test Points:
  4. 3Schematic
  5. 4Test Equipment Requirements
    1. 4.1 Power Supplies
    2. 4.2 Meters
    3. 4.3 Oscilloscope
    4. 4.4 Loads
  6. 5Test Setup and Results
    1. 5.1 Initial Setup
    2. 5.2 Power Up
    3. 5.3 Over Voltage Protection
    4. 5.4 Enable Control
    5. 5.5 Input Reverse Polarity
    6. 5.6 Load Transient Response
  7. 6EVM Board Layout and Bill of Materials
    1. 6.1 EVM Board Layout
    2. 6.2 Bill of Materials
  8. 7Revision History

2.10 RC Input Snubber Option (R7 and C15):

Resistor R7 and capacitor C15 provide an option for input snubber which may be required during the AC super imposed test to avoid excessive input voltage ringing when diode MOSFET (Q1) turns off every cycle of AC voltage ripple. Ringing can occur due to input cable inductance.
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