SC4810B

High Performance Current Mode PWM Controller with Complementary Output, Programmable Delay POWER MANAGEMENT Description The SC4810B/E is a 16 pin BICMOS primary side PWM 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 Telecom applications. The www.DataSheet4U.com output for switch is complementary to each other with programmable delay between each transition. The active technique allows single ended converters beyond 50% duty cycle and greater flux swing for the power transformer while reducing voltage stresses on the switches. The separate sync pin 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 SC4810B/E has a turn-on voltage threshold of 7V. In the SC4810B, OUT2 is inverted to drive the N-MOSFET. In the SC4810E, OUT2 is non-inverted to drive the P-MOSFET. These devices are available in a TSSOP-16 or MLPQ-16 lead package. SC4810B/E Features ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ Operation to 1MHz Accurate programmable maximum duty cycle Line voltage monitoring External frequenc...