Date: 16/09/2010

8-pin resonant half bridge control ICs from IR

International Rectifier has introduced the IRS2795(1,2)S, the industry's first 8-pin resonant half-bridge control ICs for energy efficient Switch Mode Power Supplies (SMPS) used in LCD televisions and monitors, home theater systems, desktop computers, printers and game console applications.

The IRS2795(1,2)S resonant half-bridge control ICs features programmable switching frequency of up to 500 kHz with 50 percent fixed duty cycle, programmable soft start frequency and soft start time, and programmable deadtime for optimized Zero Voltage Switching (ZVS) under all load conditions.

"As more and more designers seek to boost the overall efficiency of their system using resonant half-bridge topologies, combined with the IR11682 SmartRectifier IC, the new IRS2795xS 8-pin devices deliver a highly efficient power supply solution that simplifies design and reduces overall system cost," said Tom Ribarich, director, IR's Energy Saving Products Business Unit.

The IRS2795(1,2)S devices offer over-current 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 +600Vdc, micro-power start-up and ultra-low quiescent current, as well as user initiated micro-power "sleep mode".

The devices are lead free and RoHS compliant.

Specifications
Part Number Package VOFFSET(V) IO+ & IO- (mA) Programmable Frequency
(kHz) Programmable Dead-time
(ns) OCP Threshold
(V)
IRS27951S SO-8 600 300/900 25-500 200-2000 2
IRS27952S SO-8 600 300/900 25-500 200-2000 3


Price: Starts at US $0.74 for 10K pieces