SLVU641A January   2012  – November 2021 TPS54120

 

  1.   Trademarks
  2. 1Background
  3. 2Setup
    1. 2.1 Input and Output Connections and Jumper Descriptions
    2. 2.2 Modifications
      1. 2.2.1 SW Output Voltage Setpoint
      2. 2.2.2 LDO Output Voltage Setpoint
      3. 2.2.3 Switcher Slow-Start Time
      4. 2.2.4 LDO Start-Up
    3. 2.3 Equipment Interconnect
  4. 3Operation
  5. 4Test Results
    1. 4.1 Output Voltage Ripple
    2. 4.2 Output Noise
    3. 4.3 Output Turn-On
    4. 4.4 Load Transient
    5. 4.5 Efficiency
    6. 4.6 Thermal Characteristic
  6. 5Board Layout
    1. 5.1 Layout Description
  7. 6Schematic
  8. 7Bill of Materials
  9. 8Revision History

4.3 Output Turn-On

Figure 4-3 shows the SW output voltage turn-on from the SW enable for the TPS54120EVM with VIN = 12 V, SW OUT = 4.1 V, LDO OUT = 3.3 V, and IOUT = 400 mA, Fswitching = 480 kHz.

GUID-D39F218B-CA91-42C3-A99D-6F2A6A75DD72-low.gifFigure 4-3 Switcher Converter Output Voltage Turn-On, SW Enable

Figure 4-4 shows the LDO output voltage turn-on from the LDO enable for the TPS54120EVM with VIN = 12 V, SW OUT = 4.1 V, LDO OUT = 3.3 V, and IOUT = 400 mA, Fswitching = 480 kHz.

GUID-FC446209-71B6-495A-8D3C-0F726A9CC734-low.gifFigure 4-4 LDO Output Voltage Turn-On, LDO Enable

Figure 4-5 shows the LDO output voltage turn-on of TPS54120 from the SW enable for the TPS54120EVM with VIN = 12 V, SW OUT = 4.1 V, LDO OUT = 3.3 V, and IOUT = 400 mA, Fswitching = 480 kHz.

GUID-64021E74-4CB7-41C2-8063-7C6A59AFA786-low.gifFigure 4-5 LDO Output Voltage Turn-On, SW Enable