UG-710
ADP1055-EVALZ User Guide
Rev. B | Page 10 of 43
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.
12
386-
021
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.
12
38
6-
0
22
Figure 22. 100 ns Extra On Time Added to OUTB and OUTC
1
23
86-
02
3
Figure 23. Volt Second Balance Disabled, Duty Balance Disabled
Yellow Trace: Primary Current, 5 A Div
Red and Green Trace: OUTB and OUTD
123
86-
0
24
Figure 24. Volt Second Balance Enabled, Duty Balance Disabled
Yellow Trace: Primary Current, 5 A/Div
Red and Green Trace: OUTB and OUTD
123
86-
025
Figure 25. Volt Second Balance During 25% Load Transient
