CAPZero Integrated Circuits

Power Integrations' CAPZero is a family of self-powered ICs designed to reduce the losses associated with input filter capacitor discharge resistors when AC voltage is present. Designed to be connected in series with existing discharge resistors, each CAPZero device contains an integrated loss of AC detector and back-to-back MOSFETs in an SO-8 package.

When AC input voltage is present, CAPZero remains in an OFF state, blocking current flow in the discharge path and eliminating power losses. When the AC is removed, the CAPZero turns on, thereby switching in the resistors and allowing discharge of the input filter capacitance. CAPZero is self powered from the AC line with a power consumption of less than 5 mW at 230 VAC.