NCP1246 ONSEMI [ON Semiconductor], NCP1246 Datasheet - Page 29

• Manufacturer Part Number: NCP1246
• Description: Fixed Frequency Current Mode Controller for Flyback Converters
• Manufacturer: ONSEMI [ON Semiconductor]

Internal Overpower Protection
proportional to the square of the peak current in
discontinuous conduction mode:
The power delivered by a flyback power supply is
P
OUT
+
1
2
@ h @ L
P
@ F
Figure 62. Slope Compensation Timing Diagram
SW
Figure 61. Slope Compensation Block Diagram
@ I
P
2
http://onsemi.com
(eq. 3)
NCP1246
29
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.
Unfortunately, due to the inherent propagation delay of