Current Sensor Provides Wide Input

Operating with an input range from 8 to 450 Vdc the HV7800 high-side current sensor works with dc-power systems of 12V, 24V, and 48V and off-line ac systems of 85V to 265V. The IC operates by sensing the voltage across an external resistor and transmitting this reading to a ground-referenced circuit at a gain of one with a typical accuracy of ±1%. High-side current sensing allows the ground to be undisturbed when sensing input or load currents. As grounding-system impedances in low-side current sensing often cause signal degradation or electromagnetic interference, the HV7800 is used on the high side of a circuit, avoiding these sensing problems. RoHS compliant, the sensor is available in a SOT23-5 package with a price of $0.56 each/1,000. SUPERTEX INC., Sunnyvale, CA. (408) 222-8888.