CAPZero Family Power Supply Reference Design Kit

When AC voltage is applied, RDK-252 blocks current flow in the X capacitor safety discharge resistors, reducing the power loss to less than 5 mW, or essentially zero at 230 VAC. When AC voltage is disconnected, RDK-252 automatically discharges the X capacitor by connecting the series discharge resistors. This operation allows total flexibility in the choice of the X capacitor to optimize differential mode EMI filtering and reduce inductor costs, with no change in power consumption.The simplicity and ruggedness of the two terminal RDK-252 IC makes it an ideal choice in systems designed to meet EuP Lot 6 requirements. The RDK-252 voltage grades: 1000 V. The voltage rating required depends on surge requirement and circuit configuration of the application.

• Blocks current through X capacitor discharge resistors when AC voltage is connected
• Automatically discharges X capacitors through discharge resistors when AC is disconnected
• Simplifies EMI filter design - larger X capacitor allows smaller inductive components with no change in consumption
• Only two terminals - meets safety standards for use before or after system input fuse
• >4 mm creepage on package and PCB
• Self supplied - no external bias required
• High common mode surge immunity - no external ground connection
• High differential surge withstand - 1000 V internal MOSFETs
• Total Series Resistance: 780 KO