SLUUCF8 March   2021 TPS53676

 

  1.   Trademarks
  2. 1 Introduction
  3. 2 Features
  4. 3 Applications
  5. 4 System Description
    1. 4.1 Phase configuration selection
    2. 4.2 Jumper details
    3. 4.3 On-board load transient
  6. 5 Test Equipment
  7. 6 Test Procedure
    1. 6.1 Start-up Test
    2. 6.2 Shut down Test
    3. 6.3 Steady-state Test
    4. 6.4 Load Transient Test
    5. 6.5 Efficiency Plot
    6. 6.6 Bode plot
  8. 7 Fusion GUI
  9. 8 Evaluation Module (EVM) Hardware
  10. 9 Schematic and Bill of Materials
  11. 10Read This First
    1. 10.1 About This Manual
    2. 10.2 Glossary
    3. 10.3 Related Documentation
    4. 10.4 Support Resources

6.3 Steady-state Test

Use the following procedure for the steady-state test:

RAILA:

  1. Set the load current to 50 A.

  2. Make sure all default jumpers (J1 to J9) settings as shown in Table 4-3.

  3. Connect probes VOUTA (J15, BNC cable), PWM1 (TP31), PWM2(TP32), and PWM3(TP33).

  4. Add offset to VOUTA signal as 0.88V, and 4mV/div.

  5. Set up the time / div on the oscilloscope to: 0.5 μs/div.

  6. Turn on the power supply (with the voltage set to 12 V and the current limit set to 10 A).

  7. Slide the enable switch ‘S1’ to the ON position and measure output voltage as 0.88V.

  8. Measure output voltage ripple and phase interleaving.

  9. Jitter can be measured with set scope in "Fast acquisition mode".

GUID-20210305-CA0I-XC5F-X7FF-KCVPTFBXJZSC-low.jpgFigure 6-7 VOUTA Steady-state Output voltage Ripple
GUID-20210305-CA0I-JMNQ-DZHL-NMXNMQTG2WWQ-low.jpgFigure 6-8 VOUTA PWM Jitter

RAILB:

  1. Set the load current to 10 A.

  2. Make sure all default jumpers (J1 to J9) settings as shown in Table 4-3.

  3. Connect probes VOUTB (J16, BNC cable), BPWM1 (TP31), BPWM2 (TP55), and PWM3(TP57) as shown.

  4. Add offset to VOUTB signal as 0.8V, and 4mV/div.

  5. Set up the time / div on the oscilloscope to: 1 μs/div.

  6. Turn on the power supply (with the voltage set to 12 V and the current limit set to 10 A).

  7. Slide the enable switch ‘S2’ to the ON position and measure output voltage as 0.8V.

  8. Measure output voltage ripple and phase interleaving.

  9. Jitter can be measured with set scope in "Fast acquisition mode".

GUID-20210304-CA0I-XKHX-QB6W-CW1DX9D5JVN0-low.jpgFigure 6-9 VOUTB Steady-state Output voltage Ripple
GUID-20210304-CA0I-LCHK-G5HV-MXFG7ZNGNW3V-low.jpgFigure 6-10 VOUTB PWM jitter