LT3781
LT3781 is Bootstrap Start Dual Transistor Synchronous Forward Controller manufactured by Linear Technology.
“Bootstrap” Start Dual Transistor Synchronous Forward Controller
Features s High Voltage Operation up to 72V s Synchronizable Operating Frequency and Output
Switch Phase for Multiple Controller Systems s Synchronous Switch Output s Undervoltage Lockout Protection with 6V Hysteresis for Self-Biased Power s Fixed Frequency Operation to 350k Hz s Local ±1% Voltage Reference s Input Overvoltage Protection s Low Start-Up Current s Programmable Start Inhibit for Power Supply
Sequencing and Protection s Optocoupler Support s Soft-Start Contro Ul APPLICATIO S s Isolated Telemunication Systems s Personal puters and Peripherals s Distributed Power Step-Down Converters s Lead Acid Battery Backup Systems s Automotive and Heavy Equipment
DESCRIPTIO
The LT®3781 controller simplifies the design of high power synchronous dual transistor forward DC/DC converters. The part employs fixed frequency current mode control and supports both isolated and nonisolated topologies. The IC drives external N-channel power MOSFETs and operates with input voltages up to 72V.
The LT3781 is ideal for output derived power schemes, through the use of a large undervoltage lockout hysteresis range. The part is also equipped with an 18V VCC shunt regulator, which prevents exceeding...
