SLUU381B September   2009  – February 2022 TPS51220A

 

  1.   Trademarks
  2. 1 Introduction
  3. 2 Description
    1. 2.1 Typical Applications
    2. 2.2 Features
  4. 3 Electrical Performance Specifications
  5. 4 Schematic
  6. 5 Test Setup
    1. 5.1 Test Equipment
    2. 5.2 Recommended Test Setup
    3. 5.3 List of Test Points
  7. 6 Test Procedure
    1. 6.1 Line/Load Regulation and Efficiency Measurement Procedure
    2. 6.2 Output Ripple Test
    3. 6.3 Measuring Improved Light Load Efficiency
    4. 6.4 Control Architecture and OVP Select
    5. 6.5 Overcurrent Trip Level and Output Discharge Select
  8. 7 Performance Data and Typical Characteristic Curves
    1. 7.1 Efficiency
    2. 7.2 Load Regulation
    3. 7.3 Bode Plot
    4. 7.4 Transient Response
    5. 7.5 Output Ripple and Switch Node
    6. 7.6 Turn-On Waveform
    7. 7.7 Turn-Off Waveform
  9. 8 EVM Assembly Drawing and PCB Layout
  10. 9 List of Materials
  11. 10Revision History

6.5 Overcurrent Trip Level and Output Discharge Select

  1. All jumper modifications should be done with no power applied to the EVM.
  2. The TRIP jumper (JP3) allows the user to select the voltage level used by the EVM to implement current limit. It also enables or disables the output discharge function. Table 6-3 describes each possible selection.
    Table 6-3 TRIP (JP3) Selections
    JUMPER LOCATIONMODE
    UL_D-ON (1 and 2 shorted)Overcurrent uses ultra low voltage threshold (31 mV typical) and output discharge is enabled
    UL_OFF (3 and 4 shorted)Overcurrent uses ultra low voltage threshold (31 mV typical) and output discharge is disabled
    LV_OFF (5 and 6 shorted)Overcurrent uses low voltage threshold (60 mV typical) and output discharge is disabled
    LV_D-ON (7 and 8 shorted) defaultOvercurrent uses low voltage threshold (60 mV typical) and output discharge is enabled
  3. Once a mode has been selected efficiency and regulation measurements may be retaken. Repeat steps 3 to 11 of Section 6.1. The engineer should reduce the step current when the output is less than 1 A. Section 7 shows typical data for the various modes of operation