Power chip

The NCP1910 uses SO-24WB encapsulation, incorporating an advanced circuit for powering next generation ATX or flat panel TV converters. The NCP1910 features a 65 kHz continuous conduction mode power factor controller and LLC controller carrying high voltage drivers to power more than 85 off-line power supplies. To meet stringent energy efficiency requirements, the PFC circuit implements adjustable frequency foldback to reduce switching losses when the load becomes lighter. To handle the signal sequences required by the ATX or flat-panel TV specifications, the controller includes dedicated pins that enable handshaking between the secondary and primary sides. These signals include a power good line and also a control pin that switches the controller through an optocoupler. For safety, there is an additional OVP input to provide the necessary redundancy should the main feedback network drift. Finally, a fast fault input reacts immediately in the event of an overcurrent condition by triggering an auto-recovery soft-start sequence.