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

6.4 Control Architecture and OVP Select

  1. All jumper modifications should be done with no power applied to the EVM.
  2. The FUNC jumper (JP2) allows the user to select the control architecture the EVM uses to control the output. It also enables or disables the OVP function. Table 6-2 describes each possible selection.
    Table 6-2 FUNC (jumper JP2) Selections
    JUMPER LOCATIONMODE
    CMODE_ON (1 and 2 shorted) defaultCurrent mode control and OVP enabled
    DCAP_OFF (3 and 4 shorted)D-Cap mode control and OVP disabled
    DCAP_ON (5 and 6 shorted)D-Cap mode control and OVP enabled
    CMODE_OFF (7 and 8 shorted)Current mode control and OVP disabled
  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