SCY99194 Datasheet, PDF (30/40 Pages) ON Semiconductor – Fixed Frequency Current Mode Controller

SCY99194
Figure 57. Slope Compensation Block Diagram
Figure 58. Slope Compensation Timing Diagram
Internal Overpower Protection
The power delivered by a flyback power supply is
proportional to the square of the peak current in
discontinuous conduction mode:
P_OUT
+
1
2
@
h
@
L_P
@
F_SW
@
I_P
2
(eq. 3)
Unfortunately, due to the inherent propagation delay of
the logic, the actual peak current is higher at high input
voltage than at low input voltage, leading to a significant
difference in the maximum output power delivered by the
power supply.
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