EL SEGUNDO, Calif. - International
Rectifier today introduced a reference design for +12V, 100A ORing applications. Active ORing has long replaced
diode ORing in high current 12V systems due to system efficiency and cost benefits. Now, the IRAC5001 solution
provides a further advance by reducing the number of FETs needed by 50% compared to rivals' equivalent TO-220
devices. In addition, solution volume is reduced by at least 60%, enabled by the DirectFET MOSFET double-sided
The reference design
contains four IRF6609 20V, 2mOhm DirectFET™ MOSFETs in parallel to create a 0.5mOhm effective RDS(on) for a
high efficiency ORing circuit with fast fault detection and reaction time of 130ns.
"FET Check" feature is enabled in this reference design, and allows real-time"FET-good" checking for extra fault
protection and the highest possible reliability for high power systems.
Active ORing is a
key efficiency requirement for many high-end systems requiring maximum up-time, such as carrier-class communication
equipment, telecom and datacom system servers. IR's IR5001S IC is ideal for applications such as high reliability
server and storage systems where "N+1" redundant power supplies feed into a central load.
"Our new ORing reference design gives designers a demonstrated
means to test the capabilities of IR's new ORing IC in high current applications. ORing circuits made with the
IR5001S and DirectFET MOSFETs can reduce on-board power dissipation and can be made much smaller than diode
solutions for the same power level, all this with an incredibly fast typical 130ns turn-off delay time," said
Stephen Oliver, Marketing Manager for AC-DC Products at International Rectifier.