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IRDC5001-LS48V
power Supply A. For example, V B = 49V, and V A = 48V. This guarantees that power supply B is
delivering all the power to the load, while power supply A is on stand by (has zero output current). A
150W IR2085S DC Bus Converter is used on the output of the demo board.
To perform the test, apply a short circuit across the output terminals of power supply B. As the bus
voltage drops below 48V (because both power supplies and the redundant bus caps are now shorted), a
reverse current will start to flow through the active ORing MOSFET M2 (in line with source B). The
IR5001 at source B will detect this reverse current flow and will turn M2 MOSFET off in about 120nS,
while allowing only 4A of reverse current flow. This is shown in Fig. 4, which also shows Vds
waveform for the MOSFET M2. When the MOSFET turns off, the energy stored in the stray leakage
inductance is dissipated in the avalanche mode that last about 20nS. The calculated avalanche energy is
about 5uJ, which is negligible compared to the 180mJ avalanche rating of IRF7495.
Another waveform shown in Fig. 4 is the redundant bus voltage (green trace). With 48V being delivered
to a 150W bus converter load, with source B shorted, only 3V bus voltage disturbance is observed.
VB
VA
IR2085S
DC bus
Load
converter
NO1
M1
Short circuit
Current
M2
NO2
Figure 3. IR Active ORing function tests
International Rectifier
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