Texas Instruments LM74700- Q1, Руководство пользователя

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3.2 ORing Application
When using the LM74700-Q1 as an ORing device, if the input supplies operate at slightly different voltages, the
voltage at the common load point will follow the higher voltage. The LM74700-Q1 prevents reverse current flow
from the common load point to the lower voltage supply rail. This test uses two LM74700DDFEVMs with 15 V at
the input of the first EVM and 12 V at the input of the second EVM and the output of both the EVMs are shorted.
As
Figure 3-3 shows, the 15-V source at EVM1 is turned off for a period of time and the output (CH2) drops to
12-V source from EVM2. When the 15-V source is turned on again, the output rises to 15 V from EVM1. CH1
shows the input to EVM1, CH2 shows the output and CH3 shows input of EVM2.
Figure 3-3. ORing Application – Higher Supply Switchover
Next, the 12-V source at EVM2 is turned off for a period of time and turned on again, the output (CH2) does not
change.
Figure 3-4 captures this test.
Figure 3-4. ORing Application 12-V – Lower Supply Test
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6 LM74700DDFEVM: Evaluation Module for LM74700-Q1 SNOU177 – DECEMBER 2020
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