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11-Feb-13
RDR-91 12 V, 1 A, Universal Input Supply
17 OVP Operation Verification
While the RD-91 is in normal operation, monitor the output with a storage oscilloscope.
To cause an overvoltage condition to occur, short-circuit the optocoupler LED (as shown
below) to open the feedback control loop. The oscilloscope will capture the output voltage
rising until the increasing voltage across VR2 causes it to conduct, and the TNY278PG
device latches off. To reset the OVP latch, the AC input power must be removed long
enough to allow the input bulk capacitors to fully discharge.
Short these points to
test OVP functionality
Figure 33 – Point on PCB to Apply Short-Circuit to Trigger OV Shutdown.
Power Integrations
Page 33 of 35
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