Analog Devices LTC1922-1 Product Info

• Adaptive DirectSense^™ Zero Voltage Switching
• Integrated Synchronous Rectification Control for Highest Efficiency
• Output Power Levels from 50W to Kilowatts
• Very Low Start-Up and Quiescent Currents
• Compatible with Voltage Mode and Current Mode Topologies
• Programmable Slope Compensation
• Undervoltage Lockout Circuitry with 4.2V Hysteresis and Integrated 10.3V Shunt Regulator
• Fixed Frequency Operation to 1MHz
• 50mA Outputs for Bridge Drive and Secondary Side Synchronous Rectifiers
• Soft-Start, Cycle-by-Cycle Current Limiting and Hiccup Mode Short-Circuit Protection
• 5V, 15mA Low Dropout Regulator
• 20-Pin PDIP and SSOP Packages

The LTC1922-1 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 full-bridge 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 optimal performance.

The LTC1922-1 also provides secondary side synchronous rectifier control. The device uses peak current mode control with programmable slope comp and leading edge blanking.

The LTC1922-1 features extremely low operating and start-up currents to simplify off-line start-up and bias circuitry. The LTC1922-1 also includes a full range of protection features and is available in 20-pin through hole (N) and surface mount (G) packages.

Applications

• Telecommunications, Infrastructure Power Systems
• Distributed Power Architectures
• Server Power Supplies
• High Density Power Modules