Synchronous Dual Mode Phase Modulated Full Bridge Controllers

The LTC3722-1/LTC3722-2 phase-shift PWM controllers provide all of the control and protection functions necessary to implement a high efficiency, zero voltage switched (ZVS), full bridge power converter. Adaptive ZVS circuitry delays the turn-on signals for each MOSFET independent of internal and external component tolerances. Manual delay set mode enables secondary side control operation or direct control of switch turn-on delays.

The LTC3722-1/LTC3722-2 feature adjustable synchronous rectifier timing for optimal efficiency. A UVLO program input provides accurate system turn-on and turn-off voltages. The LTC3722-1 features peak current mode control with programmable slope compensation and leading edge blanking, while the LTC3722-2 employs voltage mode control.

The LTC3722-1/LTC3722-2 feature extremely low operating and start-up currents. Both devices include a full range of protection features and are available in the 24-pin surface mount GN package.

Applications

* Telecommunications, Infrastructure Power Systems

* Distributed Power Architectures

* Server Power Supplies

* Adaptive or Manual Delay Control for Zero Voltage Switching Operation

* Adjustable Synchronous Rectification Timing for Highest Efficiency

* Adjustable Maximum ZVS Delay

* Adjustable System Undervoltage Lockout Hysteresis

* Programmable Leading Edge Blanking

* Very Low Start-Up and Quiescent Currents

* Current Mode (LTC3722-1) or Voltage Mode (LTC3722-2) Operation

* Programmable Slope Compensation

* VCC UVLO and 25mA Shunt Regulator

* 50mA Output Drivers

* Soft-Start, Cycle-by-Cycle Current Limiting and Hiccup Mode Short-Circuit Protection

* 5V, 15mA Low Dropout Regulator

* 24-Pin Surface Mount GN Package