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VIN 1 Power input to the linear regulator; used in the modulator for input voltage feed−forward PVCC 25 Power output of the linear regulator; directly supplies power for the

11 V M PFC Current Amplifier Output A resistor to ground sets the maximum power level 12 LBO PFC Line Input Voltage Sensing Line feed forward and PFC brown-out3. 13 Fold PFC Fold

• View reference designs, design notes, and other material supporting the design of highly efficient power supplies

Once the voltage on this V CC capacitor reaches the V CC(ON) level (typically 8.4 V), the current source turns off and pulses are delivered by the output stage: the circuit is

happens, the latch is not acknowledged since the timer countdown has been prematurely aborted. To avoid this situation, the NCP12510 is equipped with Pre−short logic for OCP

This capacitor is charged with a constant current source and its voltage is compared to an internal threshold (V FBth ) fixed by FB voltage (see.

• Fault input (C and D versions): The C and D versions of NCP1380 include a brown−out circuit which safely stops the controller in case the input voltage is too low.. Restart occurs

However, to avoid growing the transformer size, an existing technique consists in freezing the peak current to a maximum value (0.8/R sense in our case) but authorizes