Half-Bridge Controllers Simplify SMPS Design

Trumpeted as the industry’s first eight-pin  resonant half-bridge control ICs for energy-efficient switchmode power supplies (SMPS), the IRS2795(1,2)S resonant half-bridge control ICs offer a high level of programmability and protection. Features include programmable switching frequencies up to 500 kHz with 50% fixed duty cycle, programmable soft-start frequency and soft-start time, and programmable dead time for optimized zero voltage switching under all load conditions. Both offer over-current protection using the on-state resistance of a low-side MOSFET, eliminating the need for a current-sense resistor. Other features include floating channel bootstrap operation up to 600 Vdc, micro-power startup and ultra-low quiescent current, and a user-initiated micro-power sleep mode. Pricing for the IRS27951S or IRS27952S begins at US $0.74 each/10,000. For more information, contact Sian Cummins at INTERNATIONAL RECTIFIER, El Segundo, CA. (310) 252-7148.