Analog Devices ADP1055-EVALZ User Manual page 10

UG-710
Volt Second Balance Tab
Refer to the ADP1055 data sheet for detailed operation and
manual setup of the volt second balance feature.
It is recommended to use the Auto Setup feature to setup the
PWMs in hard switching mode.
For full bridge phase shifted topology, use the settings shown in
Figure 21.
Figure 21. PWM and SR Window (Full Bridge Phase Shifted)
What follows is an example that shows the effectiveness of the
volt second balance feature. A deliberate extra on time was
added to one leg of the H bridge creating an imbalance in the
transformer.
Figure 22. 100 ns Extra On Time Added to OUTB and OUTC
Figure 23. Volt Second Balance Disabled, Duty Balance Disabled
Figure 24. Volt Second Balance Enabled, Duty Balance Disabled
Figure 25. Volt Second Balance During 25% Load Transient
Rev. B | Page 10 of 43
ADP1055-EVALZ User Guide
Yellow Trace: Primary Current, 5 A Div
Red and Green Trace: OUTB and OUTD
Yellow Trace: Primary Current, 5 A/Div
Red and Green Trace: OUTB and OUTD