RVSY018-SR-R | RECOM

Rectification Controller, RVSY018-SR-R, RECOM

The RVSY018 is a high-performance synchronous rectification (SR) controller designed to support both deep Continuous Conduction Mode (CCM) and Discontinuous Conduction Mode (DCM) operations. It operates at frequencies up to 700kHz, making it ideal for high-speed power conversion applications. Key functional parameters are programmable via external resistors, allowing flexible configuration and optimization according to the characteristics of the selected SR MOSFET for improved overall system performance. The RVSY018 utilizes relative maximum voltage detection technology to enable accurate SR MOSFET turn-on, effectively preventing false triggering caused by resonant negative voltages in DCM. It is also compatible with soft-switching topologies such as Quasi-Resonant (QR) and Active Clamp Flyback (ACF). An intelligent voltage-limited conduction feature dynamically reduces the gate drive voltage when the VDS drop is minimal.

This increases the MOSFET’s internal resistance, preventing premature turn-off and minimizing conduction losses, thereby enhancing overall efficiency. The controller monitors the drain voltage of the SR MOSFET through the VD pin, which includes a built-in 100μA current source. The turn-off threshold is programmable via a resistor placed between the VD pin and the drain of the SR MOSFET. Additionally, the VD-to-VDD path acts as a linear regulator with robust power delivery capability, typically eliminating the need for an external auxiliary winding. The VD pin is specifically designed to tolerate negative voltage transients, ensuring stable internal circuit operation even in the presence of large negative VDS swings.

Features

• Relative Maximum Voltage Detection Ensures Effective Turn-on Performance
• Supports DCM and CCM Operations
• Programmable Turn-off Threshold
• Programmable Blanking Time
• High-power Self-powering
• No Need for Auxiliary Winding
• Supports Both High-side and Low-side Synchronous Rectification

Applications

• DC-DC Power Converter
• AC-DC Power Supplies
• Battery Management System Power Supplies
• Various Module Power Supplies