International Rectifier Corp. (IR) announced the introduction of the robust IR25750 general purpose current sensing IC available in an ultra-compact SOT23-5L package that boosts overall system efficiency while delivering dramatic space savings for high-current applications. Measuring high currents (10-100A) through a power MOSFET or IGBT typically requires a large resistor which generates excess power losses (10- to 30-W). By extracting the voltage across the internal Rds(on) of a power MOSFET or the VCE(on) of an IGBT during the switch’s on-time, the IR25750 eliminates large external current sensing resistors, heatsinks, and excess power losses.
The IR25750's gate drive input provides the VCC supply voltage to the IC and synchronizes the Rds(on) or VCE(on) sensing circuit to the on and off times of the MOSFET or IGBT. Leveraging IR's proprietary high-voltage technology, the device also features 600V blocking capability necessary for blocking high VDS or VCE voltages during the switch off-time. Other key features include low gate input capacitance, internal filter delay at turn-on (200 nsec typ.) and internal 20.8 V zener clamps on GATE and CS pins.
"The IR25750 current sensing IC is a novel building block that uses the Rds(on) of a power MOSFET or the VCE(on) of an IGBT to measure current, eliminating the need for large external current sensing resistors," said Tom Ribarich, Director of Lighting Systems and Applications, IR's Energy Saving Products Business Unit. "These features enable dramatic efficiency and space savings in high current applications including general purpose switch mode power electronics, motor control and industrial equipment," he added.
Featuring integrated ESD and excellent latch immunity on all inputs and outputs to enable rugged monolithic protection, the IR25750 is qualified to industrial grade and moisture sensitivity level 1 (MSL1). Pricing for the IR25750LPbF begins at US $0.23 each in quantities of 10,000-units. Production quantities are available immediately. The devices are lead free and RoHS compliant.