LTC1922-1

U U LTC1922-1 Synchronous Phase Modulated Full-Bridge Controller FEATURES DESCRIPTIO s Adaptive DirectSenseTM Zero Voltage Switching s Integrated Synchronous Rectification Control for Highest Efficiency s Output Power Levels from 50W to Kilowatts s Very Low Start-Up and Quiescent Currents s Compatible with Voltage Mode and Current Mode Topologies s Programmable Slope Compensation s Undervoltage Lockout Circuitry with 4.2V Hysteresis and Integrated 10.3V Shunt Regulator s Fixed Frequency Operation to 1MHz s 50mA Outputs for Bridge Drive and Secondary Side Synchronous Rectifiers s Soft-Start, Cycle-by-Cycle Current Limiting and Hiccup Mode Short-Circuit Protection s 5V, 15mA Low Dropout Regulator s 20-Pin PDIP and SSOP Packages U APPLICATIO S s Telecommunications, Infrastructure Power Systems s Distributed Power Architectures s Server Power Supplies s High Density Power Modules The LTC®1922-1 phase shift PWM controller provides all of the control and protection functions necessary to implement a high performance, zero voltage switched, phase shift, full-bridge power converter with synchronous rectification. The part is ideal for developing isolated, low voltage, high current outputs from a high voltage input source. The LTC1922-1 combines the benefits of the fullbridge topology with fixed frequency, zero voltage switching operation (ZVS). Adaptive ZVS circuity controls the turn-on signals for each MOSFET independent of internal and external component tolerances for optima...