NCP1230GEVB: 19V @ 90W, 85 ~ 264VAC in

The NCP1230 implements a standard current mode control architecture. It’s an ideal candidate for applications where a low parts count is a key parameter, particularly in low cost adapter power supplies. The NCP1230 combines a low standby power mode with an event management scheme that will disable a PFC circuit during Standby, thus reducing the no load power consumption. The 90 W Evaluation Board demonstrates the wide range of features found on the NCP1230 controller.

The NCP1230 has a PFC Vcc output pin which provides Vcc power for a PFC controller, or other circuitry. The PFC Vcc pin is enabled when the output of the power supply is up and in regulation. In the event that there is an output fault, the PFC Vcc pin is turned off, disabling the PFC controller, reducing the stress on the PFC semiconductors.

In addition to excellent no load power consumption, the NCP1230 provides an internal latching function that can be used for over voltage protection by pulling the CS pin above 3.0 V.

This Demo Board is configured as a two stage adapter power supply. The first stage operates off of the universal input, 85−265 Vac, 50−60 Hz, using the MC33260 Critical Conduction Mode controller, in the Boost Follower mode. The output voltage from the Boost Follower (when Vin is 85 Vac) is 200 V and as the input line increases to 230 Vac the output of the Boost Follower will ramp up to 400 Vdc. The second stage of the power supply features the NCP1230 driving a flyback power stage. The output of the second stage is 19 Vdc capable of 90 W of output power. It is fully self−contained and includes a bias supply that operates off of the Auxiliary winding of the transformer.