Analog Devices ADP1046A User Manual page 29

ADP1046A 100Watt
Evaluation board
Figure 46 – High frequency content of output voltage ripple at 8A load,
Green trace: AC coupled output voltage
C. Transient Response under DCM/CCM transition: Figure 48 shows the dynamic response of the system under a
load step of 0.1-5A (slew rate1A/µs). A low starting current is chosen so that the converter is forced to disable the
synchronous rectifiers due to the light load threshold setting in the CS2 window. In contrast, Figure 49 shows the
response with the light load threshold set at 0A (SR always on). This forces the output inductor current to be
continuous and the converter remains in CCM despite the load condition drawing energy from the output capacitor to
charge the inductor.
Figure 45 - Load step, 0A - 8A step load, 48VDC, SR enabled at 0A
Green trace: AC coupled output voltage
Yellow trace: Load current
48VDC
Figure 47 – Low frequency content of output voltage ripple at 8A load, 48VDC
Green trace: AC coupled output voltage
Rev. 1.3 | Page 29 of 55
PRD1386