SBVA102 august   2023 TPS56837

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2D-CAP3 Control Architecture
    1. 2.1 Adaptive On-Time Control
    2. 2.2 D-CAP3 Control
  6. 3Large Duty Cycle Operation
    1. 3.1 Min Off-Time Performance of Buck Converters
    2. 3.2 On-Time Extension Function
  7. 4Bench Test and Comparison
    1. 4.1 Comparison Between TPS56837 and TPS56637
    2. 4.2 Comparison of On-Time Extension between TPS56837 and TPS568230
    3. 4.3 Load Transient Improvement by On-Time Extension
  8. 5Summary
  9. 6References
  10. 7Also From TI

4 Bench Test and Comparison

The bench tests are done on the TPS56837EVM. For details, see the TPS56837EVM evaluation module User's Guide. The bench test setup and configuration is listed in Table 4-1.

Table 4-1 Bench Setup for TPS56837
VOUT(V)L (µH)Cout (µF)CFF (pF) / C15RFF (kΩ) / R14Rtop (kΩ) / R9Rbot (kΩ) / R8Mode
53.34 × 22 µF (1206, 10 V)100022030PSM / 500 kHz

The waveforms in Figure 4-1 to Figure 4-4 show the SW behaviors with and without the ON-time extension function triggered under different input voltage.

GUID-20230820-SS0I-FSH4-WVW7-CLLD9J2B6SDM-low.svgFigure 4-1 Normal Operation Without On-Time Extension (Vin=8 V)
GUID-20230820-SS0I-BJ70-NMSG-QV50WLGSG9R8-low.svgFigure 4-3 On-Time Extension (Vin=5.52 V)
GUID-20230820-SS0I-7QPN-SQVF-FKWHX0D9LPVF-low.svgFigure 4-2 On-Time Extension (Vin=6.48 V)
GUID-20230820-SS0I-RX5R-XRKQ-G3MT5GGBDSZH-low.svgFigure 4-4 On-Time Extension (Vin=5.12 V)