Synchronous Dual Mode Phase Modulated Full Bridge Controllers

Description: The LTC3722-1 and LTC3722-2 phase-shift PWM controllers offer all necessary control and protection functions for implementing a high-efficiency, zero voltage switched (ZVS), full bridge power converter. The adaptive ZVS circuitry delays the turn-on signals for each MOSFET, independent of internal and external component tolerances. The manual delay setting enables secondary side control operation or direct control of switch turn-on delays. The LTC3722-1 and LTC3722-2 include adjustable synchronous rectifier timing to optimize efficiency. An under-voltage lockout (UVLO) program input ensures precise system turn-on and turn-off voltages. The LTC3722-1 utilizes peak current mode control with programmable slope compensation and leading edge blanking, while the LTC3722-2 employs voltage mode control. Both devices exhibit extremely low operating and start-up currents and incorporate a comprehensive range of protection features. They are available in a 24-pin surface mount GN package.

The LTC3722-1 and LTC3722-2 are sophisticated integrated circuits designed for high-performance power management applications. They are particularly well-suited for full bridge power converters, which are essential in various applications including telecommunications, industrial power supplies, and renewable energy systems. The phase-shift PWM control technique utilized by these controllers enhances the efficiency of power conversion by minimizing switching losses, especially under varying load conditions.

The adaptive ZVS circuitry is a critical feature that allows for the optimization of MOSFET switching behavior. By delaying the turn-on signals, it ensures that the MOSFETs switch at zero voltage, thereby reducing electromagnetic interference (EMI) and improving overall system reliability. The manual delay setting feature provides flexibility, enabling designers to fine-tune the switching sequence to match the specific requirements of their application.

Both controllers feature adjustable synchronous rectifier timing, which is pivotal for achieving high efficiency in power conversion. This capability allows for the optimization of the rectification process, reducing conduction losses and enhancing the overall performance of the converter.

The inclusion of a UVLO program input is essential for ensuring safe operation. It provides a reliable means to define the voltage thresholds at which the system will turn on and off, thereby protecting the circuit from under-voltage conditions that could lead to malfunction or damage.

The LTC3722-1's peak current mode control is beneficial for regulating output current and improving transient response. The programmable slope compensation helps to stabilize the control loop under varying load conditions, while the leading edge blanking feature prevents false triggering during the initial switching period. In contrast, the LTC3722-2's voltage mode control offers a simpler implementation, which may be preferred in applications where rapid response is not as critical.

Both devices are designed to operate with minimal power consumption, which is a significant advantage in battery-powered and energy-efficient applications. The comprehensive protection features incorporated into both controllers, such as over-current protection and thermal shutdown, ensure robust operation under a variety of conditions.

The 24-pin surface mount GN package allows for compact designs and facilitates integration into modern electronic systems, making the LTC3722-1 and LTC3722-2 excellent choices for engineers seeking efficient and reliable power management solutions.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 mod e 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.