X-capacitors can hold charge after mains-powered equipment is turned off. Without a discharge device, this can result in residual high-voltage being present, for example, on a disconnected mains plug.
The simplest discharger is a resistor, but using one results in constant power dissipation.
CapZero is a two terminal integrated circuit that remains in a high-impedance state (21.7uAmax at 25C = 5.2mW at 240V) when mains frequency is connected, then switches to a low impedance state when mains frequency is removed, rapidly discharging the capacitor. Discharge current is limited by a series resistance totalling 142k to 7.5Mohms.
CapZero-2 can handle a wider range of capacitors than the original – now from 0.1µF to 6µF – and voltages up to 1kV (6kV transient). The orignal CapZero was a range of products, with the same quiescent current, rated at either 825 or 1,000V, and up to 5µF.
Second generation products are safety-certified to CB and Nemko requirements, developers do not need to perform a separate capacitive discharge safety test of the power circuit.
“CAPZero-2 allows power supplies to comply with IEC 62368-1, the new over-arching safety standard covering a broad segment of energy-using equipment. The standard replaces IEC 60950 and IEC 60065, and will shortly become mandatory,” said the firm.
Packaging is SO-8.
Applications include air-conditioners, home appliances, small appliances, cookers, vacuum cleaners, TVs, desktop and notebook PCs, projectors, workstations, computer monitors, and printers.
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