SLUAAG5 March   2022 TPS62933

 

  1.   Trademarks
  2. 1Introduction
  3. 2Cff in High-Output Voltage Internally Compensated PCM Buck Converter
  4. 3Effects of Cff on the Loop
  5. 4Method for Selecting Cff
  6. 5Experimental Verification for TPS62933
  7. 6Summary
  8. 7References
  9.   A Validation Results for the Proposed Method

A Validation Results for the Proposed Method

Table A-1 details the validation of feedforward capacitance.

Table A-1 Validation Results
VIN (V) VOUT (V) fSW (kHz) Lchoose (μH) High Limit
CO (μF)
Without Cff		 Cchoose (μF) Cff limit Cff choose (pF) PMbench (deg)
24 5 500 6.8 106 20 × 22 μF
(Ceffective: 264 μF)		 Cff > 425 pF 470 pF 83.464
24 5 1200 3.3 119.6 20 × 22 μF
(Ceffective: 264 μF)		 Cff > 425 pF 470 pF 86.143
24 12 500 12 40.7 20 × 22 μF
(Ceffective: 98.5 μF)		 Cff > 402 pF 470 pF

102.6

For 5 V Vout, Rupper (R1) is 52.5 kΩ and Rlower (R2) is 10 kΩ.

For 12 V Vout, Rupper (R1) is 52.5 kΩ and Rlower (R2) is 3.75 kΩ.