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IRDC5001-LS48V
To evaluate the operation and performance of the active ORing demo board, connect two 48V power
supplies to the input terminals (labeled Input A and Input B), and power load to output terminals.
Caution : One of the IR5001 functional tests is the response to a short circuit of one of the
sources. Before doing this test, it is important that the current limit function of each power
supply be checked first. A safe way to test the current limit function is to set the desired current
limit, then apply a short with a very low output voltage first (<5V), then remove the short,
increase voltage by another 5-10V, apply the short again, and proceed with these steps until the
final test voltage is reached. Extra precautions should be taken for older and larger power
supplies where the current limit may not be fast enough so that shorting of the outputs can pose
safety risks.
The power load can be an electronic load or a resistor. However, a standard 1/4 brick, 1/8 brick, or
IR2085S DC Bus Converter demo board can also be used (pin-compatible through-hole solderable
connections are provided on the demo board)
To probe the circuit waveforms use an oscilloscope probe with minimal length for the ground pin and
connect directly to the pins of the IC / MOSFET device. Any standard current probe & amplifier can be
used to measure reverse current flow.
48V A+
+48V
C1 C2 C3 C4 C5 C6 C7 C8
Load +
48V B+
Load -
+48V
R3
48V A -
M1
8
7
6
5
Vout FETst
GND FETck
INN Vcc
INP Vline
4
3
2
1
D1
C10
R2
S1
5V
48V B -
M2
8
7
6
5
IR5001
Vout FETst
GND FETck
INN Vcc
INP Vline
+48V
4
3
2
1
D2
C11
C13
R5
D3
IR5001
+48V
Figure 2. IR5001 Active ORing Demo Board Schematic
The procedure for checking the response time of the IR5001 to a simulated short circuit failure of one
power source is shown in Fig. 3. The power supply B is set at about 1V higher output voltage than
International Rectifier
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