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The NCL30081 changes valley as the input voltage increases and as the output current set−point is varied (thermal fold−back and step dimming).. This

The NCP1216 automatically skips switching cycles when the output power demand drops below a given level. This is accomplished by monitoring the FB pin. In normal operation, pin

Figure 48. At low power levels or in no−load operation, the feedback voltage stays in the vicinity of 400 mV and ensures skip−cycle operation. In this mode, the peak current is

The NCL30073 start−up voltage is made purposely high to permit large energy storage in a small V CC capacitor value. This helps operate with a small start−up current which,

The power switch continues its normal switching operation and the power is supplied from the auxiliary transformer winding unless V CC goes below the stop voltage of 8 V..

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