SC4809C

High Performance Current Mode PWM Controller POWER MANAGEMENT Description The SC4809A/B/C is a 10 pin BICMOS primary side current mode controller for use in Isolated DC-DC and off-line switching power supplies. It is a highly integrated solution, requiring few external components. It features a high frequency of operation, accurately programmable maximum duty cycle, current mode control, line voltage monitoring, supply UVLO, low start-up current, and programmable soft start with user accessible reference. It operates in a fixed frequency, highly desirable for www.DataSheet4U.com Telecom applications. Features a separate sync pin which simplifies synchronization to an external clock. Feeding the oscillator of one device to the sync of another forces biphase operation which reduces input ripple and filter size. The SC4809A/B/C have different threshold and VREF to accommodate a wide variety of applications. These devices are available in the MSOP–10 lead free package. SC4809A/B/C Features ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ Operation to 1MHz Accurate programmable maximum duty cycle Line voltage monitoring External frequency synchronization Bi-phase mode of operation for low ripple Under 100µA start-up current Accessible reference voltage VDD undervoltage lockout -40°C to 105°C operating temperature 10 lead MSOP package. Lead free package available. Fully WEEE and RoHS compliant Applications ‹ Telecom equipment and power supplies ‹ Networking power supplies ‹ Power over LAN applications ‹ Ind...