New Industry Products

IR Presents IR5001S Universal Active ORing Controller IC

April 11, 2005 by Jeff Shepard

International Rectifier Corp. (IR, El Segundo, CA) presented its new the IR5001S universal high-speed controller/N-channel power MOSFET driver for high-performance, active ORing circuits. The active ORing IC, housed in an SO-8 package, is used with an external MOSFET, replacing traditional diode ORings to increase efficiency and reduce power dissipation in many high-end systems requiring maximum up-time, such as carrier-class communication equipment and telecom and datacom system servers.

The IR5001S active ORing controller IC is suitable for a wide range of active ORing circuits, including -48 V/-24 V input active ORing for carrier-class communication equipment, 24 V/48 V output active ORing for redundant ac-dc rectifiers, 12 V output active ORing for multiple-output dc-dc and ac-dc power, and for low-voltage output redundant VRM dc-dc processor power. The IR5001S can also be used in reverse-polarity applications for 48 V/24 V systems, replacing large D2Pak style diodes and an expensive relay.

When using the IR5001S with the 100 V IRF6655 DirectFET™ MOSFET, 30 W to 60 W board power levels can be addressed. With the addition of a simple charge pump circuit, the IR5001S can also be implemented in ground ORing in -48 V systems, as required by the Advanced Telecom Computing Architecture specification. The input terminals are used to determine the output voltage by measuring the differential voltage and polarity across the drain and source terminals of the external MOSFET. The output voltage of the IC drives the gate of the external MOSFET. If the current reverses polarity, the IC will quickly switch the active ORing MOSFET off by pulling the Vout pin low.

The turn-off delay for IR5001S is typically 130 nS, with a typical 20 ns FET turn-off time, in order to minimize voltage sags on the redundant bus voltage. The IR5001S IC includes diagnostic pins to determine the status of the active ORing circuit. The IR5001S can be powered from either a 36 V to 75 V universal telecom bus voltage (100 V maximum) or from an external bias supply and a bias resistor. The IR5001S can also withstand continuous gate short conditions, and up to 100 V continuous on the input pins.

The IR5001S is available now. Pricing is $0.67 each in 10,000-unit quantities. Prices are subject to change.