SC4810E Datasheet | SEMTECH

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 ponents. 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 Tele applications. The .. output for switch is plementary 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 frequency synchronization Bi-phase mode of operation for low ripple Independent programmable delays Hiccup mode current limit Under 250µA start-up current Programmable maximum volt-second clamp Accessible reference voltage VDD undervoltage lockout -40°C to 105°C operating temperature 16 lead TSSOP or MLPQ lead free packages. Both fully WEEE and Ro HS pliant Applications ‹ Tele equipment and power supplies ‹ Networking power supplies ‹ Power over LAN applications ‹ Industrial power supplies ‹ Isolated power supplies ‹ Vo IP phones Typical Application Circuit R1 C1 Q1 D4 C3 R2 C4 C2 D1 T1 D3 L1 D2 Vout +48V C5 R3 U1 SC1302A C8 6...