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The IR5001S universal high-speed controller and N-channel power MOSFET driver improves efficiency and power density in N+1 power systems by replacing traditional diode ORing circuits with an active ORing IC plus an external MOSFET. Active ORing combines two or more power sources to create a redundant power source, preserving the input power supply in case one of the input sources fails. In the event of an input power failure, the active ORing circuit disconnects the non-functioning power source as quickly as possible to prevent the system bus voltage from falling, and prevents large peak reverse currents.
Active ORing circuits made with an IR5001S and an IRF7495 HEXFET® MOSFET reduces on-board power dissipation by up to 85% versus traditional circuits using standard Schottky diodes in approximately 50% of the space.
When using the IR5001S with the IRF6655 100V DirectFET®, 30-60W board power levels can be addressed. The IRF6655 in small can DirectFET offers a space reduction of ~50% versus an SO-8, and is more appropriate for lower power applications. The 100V IRF6644 DirectFET in medium can can also be used for higher power applications, up to ~250W to 300W board power levels, eliminating the need to go with paralleled SO-8s or single larger packages.
Systems that require input protection include carrier-class communication equipment and telecom and datacom system servers that, in case of accidental shutdown, would experience system down-time that would adversely effect the quality of service (QoS) and possible loss of data.
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THE IR ADVANTAGE
 | IC controller and driver in a single SO-8 package |
| Suitable for both input ORing and output ORing for
redundant DC-DC and AC-DC power supplies |
| 130nS typical turn-off delay time, 20nS typical
FET turn-off time |
| 3A peak turn-off gate drive current |
| Asymmetrical offset voltage prevents possibility
of output oscillations at light load |
| Ability to withstand continuous gate short
conditions |
| Integrated voltage clamps on both comparator
inputs allow continuous application of up to 100V |
| Option to be powered either directly from 36V to
75V universal telecom bus voltage (100V max.), or
from an external bias supply and a bias resistor |
| Built-in diagnostics pin to determine the status of
the active ORing circuit and power system
redundancy |
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