International Rectifier IRS2795(1,2)S half-bridge control ICs

International Rectifier has introduced what it claimed is the industry’s first 8-pin resonant half-bridge control ICs for energy-efficient switchmode power supplies used in LCD televisions and monitors, home theatre systems, desktop computers, printers and game console applications.

Available in an SO-8 package, the IRS2795(1,2)S resonant half-bridge control ICs offer a high level of programmability and protection. Features include programmable switching frequency up to 500 kHz with 50% fixed duty cycle, programmable soft start frequency and soft start time, and programmable deadtime for optimised zero voltage switching under all load conditions, to achieve high efficiency and low switching noise.

The devices offer overcurrent protection using the on-state resistance (RDS(on)) of the low-side MOSFET, eliminating the need for an additional current sense resistor.

Other key features include floating channel bootstrap operation up to +600 VDC, micro-power start-up and ultra-low quiescent current, as well as user initiated micro-power ‘sleep mode’.