august 2010 doc id 15232 rev 4 1/24 24 viper16 fixed frequency viper? plus family features 800 v avalanche rugged power section pwm operation with frequency jittering for low emi operating frequency: ? 60 khz for l type ? 115 khz for h type no need of auxiliary wi nding for low power application standby power < 50 mw at 265 v ac limiting current with adjustable set point on-board soft-start safe auto-restart after a fault condition hysteretic thermal shutdown application replacement of capacitive power supply auxiliary power supp ly for appliances, power metering led drivers description the device is an off-line converter with an 800 v avalanche ruggedness power section, a pwm controller, user defined overcurrent limit, protection against feedback network disconnection, hysteretic thermal protection, soft start up and safe auto restart after any fault condition. it is able to powe r itself directly from the rectified mains, eliminating the need for an auxiliary bias winding. advance frequency jittering reduces emi filter cost. burst mode operation and the devices very low consumption both help to meet the standard set by energy saving regulations. figure 1. typical buck converter application dip-7 so - 16 so16 narrow 9 k f g t c p i g & |