Description
When AC voltage is applied, CAPZero blocks current flow in the X capacitor safety discharge resistors, reducing the power loss to less than 5 mW, or essentially zero1 at 230 VAC. When AC voltage is disconnected, CAPZero 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.

Product Highlights
• 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

EcoSmart® – Energy Efficient
• <5 mW consumption at 230 VAC for all X capacitor values

APPLICATIONs
• All ACDC converters with X capacitors >100 nF
• Appliances requiring EuP Lot 6 compliance
• Adapters requiring ultra low no-load consumption
• All converters requiring very low standby power