General purpose current sensing IC saves space

25 March 2014

International Rectifier launches the IR25750, a robust, general purpose, current sensing IC in a compact SOT23-5L package.

Measuring high currents through a power MOSFET or IGBT typically requires a large resistor which generates excess power losses (10 to 30W). 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 IC eliminates large external current sensing resistors, heatsinks, and excess power losses.
The gate drive input provides the VCC supply voltage to the IC and synchronises the Rds(on) or VCE(on) sensing circuit to the on and off times of the MOSFET or IGBT. Leveraging proprietary high-voltage technology, the device also features 600V blocking for high VDS or VCE voltages during the switch off-time. Other features include low gate input capacitance, internal filter delay at turn-on (200nsec typical.) and internal 20.8V zener clamps on gate and CS pins.
Described as a building block, the IC 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. These features enable dramatic efficiency and space savings in high current applications including general purpose switch mode power electronics, motor control and industrial equipment.
Featuring integrated ESD and excellent latch immunity on all I/O  to enable rugged monolithic protection, the IC is qualified to industrial grade and moisture sensitivity level 1 (MSL1).
The devices are lead-free and RoHS-compliant.

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