Datasheet

Evaluation Board User Guide UG-320
Rev. A | Page 15 of 48
PWM SETTINGS
The ADP1046 has a fully programmable PWM setup that
controls seven PWMs. Due to this flexibility, the IC can
function in several different topologies, such as any isolated
buck derived topology, push-pull, and flyback.
The integrated volt-second balance feature is used as a current
balancer of the two phases of the interleaved two-switch
forward design. In other power conversion circuits such as full
bridge, this feature can be used to eliminate the dc blocking
capacitor.
Each PWM edge can be moved in 5 ns steps to achieve the
appropriate dead time needed, and the maximum modulation
limit sets the maximum duty cycle. This is displayed in Figure 13.
Click the Monitor tab and then PWM & SR Settings to access
the PWM settings
Table 5. PWMs and Their Corresponding Switching Element
PWM Switching Element Being Controlled
OUTA Phase 1 primary switches
OUTB Phase 1 synchronous rectifier
OUTC Phase 1 freewheeling
OUTD Phase 2 primary switches
SR1 Phase 2 synchronous rectifier
SR2 Phase 2 freewheeling
OUTAUX Fan control
10180-012
Figure 13. PWM Settings Window in the GUI