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IRDC5001-LS48V
4A reverse
Vgs
Fet turn off
Applied short
0A
120ns
3A, 150W
3: MOSFET Ids (2.5A/div)
current
Vds
3V bus voltage disturbance
2: MOSFET Vgs, 3: MOSFET Vds; 4:Vbus
Figure 4. Waveforms during short circuit test for 150W output, 48V input. Power supplies A and
B were connected to the demo board with a one foot-long cable. Short circuit was applied on the
output terminals of power supply B.
Another unique feature of the IR5001 is that it allows system designers to assess the power redundancy
status on their system boards - whether the ORing FETs are good or not. Applying a logic high at the
“FET Check” pin will toggle the output of the IR5001 driver OFF. The desired outcome is that the
voltage across the FET, Vds, will rise above 0.3V. When “FET check” is initiated for the MOSFET
initially being on, a comparator inside IR5001 compares the Vds voltage to a reference voltage of 0.3V.
If the Vds voltage is over 0.3V, the comparator sends a logic-low signal at the “FET Short” pin,
indicating that the FET is working properly.
This feature can be tested on this demo board via a normally-OFF switch and two green LEDs. By
pressing the switch, the gate drive signals from both Active ORing controllers will be turned off, which
will turn off the channels of ORing FETs. The simplest way to test this feature is to disconnect one of
the power sources. For example, disconnect V B and with V A set at 48V, depress the switch. The green
LED next to the IC A will turn on. If a short circuit is applied across the FET A, the LED diode will not
turn on, indicating a FET short circuit. The same procedure can be used to test the ORing FET for
source B (source A would be disconnected, and source B connected).
In a real system, it may not be practical to disconnect one of the sources, and if the voltage of each
source cannot be changed, it will only be possible to determine if one of the FETs, which is connected to
a higher voltage source, is working properly or not. Usually, a truth table as shown in Table 1, can be
applied to determine the status of individual FETs based on various possible status of sources A and B.
Note that this table can determine not only if a FET is short, but also if it is open. For additional
information on how to use FET Check feature, please contact your local IR Field Applications Engineer .
International Rectifier
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