DESCRIPTION
Internally, the FAN4146 contains a diode rectifier, precision bandgap 12 V shunt regulator, precision low VOS offset-sense amplifier, time delay noise filter, window-detection comparators, and a SCR driver. The minimum number of components and the small SUPERSOTt package allow for a small-form-factor, low-cost application solution. The FAN4146 circuitry has a built-in rectifier and shunt regulator that operates with a low quiescent current. This allows for a high-value, low-wattage-series supply resistor. The internal temperature compensated shunt regulator, sense amplifier, and bias circuitry provide for precision ground-fault detection. The low VOS offset-sense amplifier allows direct coupling of the sense coil to the amplifier’s feedback signal. This eliminates the large 50/60 Hz AC-coupling capacitor. The internal delay filter rejects high-frequency noise spikes common with inductive loads. This decreases false nuisance tripping. The internal SCR driver is temperature compensated and designed to satisfy the current requirements for a wide selection of external SCRs.
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