4.
FSM_Start
: is related to the burst mode operation of the power converter. During this procedure, the PWM
is activated. The pulse sequence at a fixed duty cycle allows boosting the input voltage and increasing the
DC output voltage at a reference voltage. The state machine then moves to
FSM_Run
state.
Figure 43.
FSM_Start block diagram
5.
FSM_Run
: if the startup procedure is completed without any issue,
FSM_Start
manages the PFC operation
of the power converter. The burst operation still maintains the DC voltage. If a DC load occurs, the PFC
modulation and the control loop are activated to handle the load power demand.
Figure 44.
FSM_Run block diagram
2.6.2
Direct startup procedure
The finite state machine manages a direct startup procedure. The AC source takes the nominal voltage into
consideration. The inrush current limitation and the burst mode operation must be completed after the DC load
connection.
UM2979
Startup procedure
UM2979
-
Rev 1
page 25/70
