NE1101 is designed to meet the stringent worldwide power supply requirements. This current mode PWM controller operates at 65KHz under normal condition.  It enters into peak current limited burst mode under light load to maintain high efficiency performance and at the same time prevent audible noise.  The internal frequency jittering function helps power supply designers meet the EMI requirements easier. In addition, the NE1101 also incorporates superior protection schemes to enhance the performance and reliability of power supplies.