Zero Standby Power Secondary-Side Combo IC for Regulation and Synchronous Rectification Control of Power Supplies to 140W

The iW690 integrates a synchronous rectifier (SR) controller, secondary-side regulation controller, and a unique zero standby power (ZSP) mode into one device for power supplies up to 140W+ with excellent active mode efficiency and zero standby power capability at no load. The ZSP mode enables systems with long periods of inactivity to reduce the power supply consumption to < 5mW by putting the iW690 into an ultra-low power consumption mode. The iW690, in turn, communicates to the ZSP-compatible primary-side controller (iW9860, iW9870) to put that device also into an ultra-low standby power mode, reducing the total power consumption to < 5mW, while making it instantly available when the ZSP mode is disabled.

The iW690 supports adaptive synchronous rectifier control and drive for optimal efficiency and drives an N-channel disconnect switch to disconnect the power supply from the output during zero standby power mode, making the solution to reduce the power consumption low-cost and easy to design. Fully digital voltage compensation eliminates the need for external passive components for loop compensation.