Hello,
I recently purchased the DCP022405P to provide a dual supply voltage in order to power a pair of force transducers and instrumentation amps. I have a 24V power supply connected to a voltage regulator (LM723CJ) with current limiting capabilities that will power the converter. A 10 ohm resistor acts as a fuse bridging the current limiting pins. When I attempted to power the chip without an output attached, the 10 ohm resistor immediately blew, suggesting an excessive current draw. Though I probably should not have done this, I removed the fuse and attempted to power the converter anyways. At this point, the chip got very hot and showed no voltage from the output pins. I also attempted to power it with a more robust variable DC power supply (Agilent E3630). It allowed me to apply up to 4.5V to the input before registering a current overload, suggesting the converter had been irreversibly damaged.
I attempted to power another converter on the variable DC supply to see if the problem was due to my original supply setup. The voltage was slowly ramped up, and showed a positive gain in the output supply, reaching 5V when the input supply showed between 13-14V, well below the spec'd input voltage. The output supply continued to increase until the input voltage reached 17V, where the variable supply registered a current overload once again. Following this, the converter became completely unresponsive, showing the same characteristics that the previous converter had shown. There was nothing on the data sheet suggesting that slowly ramping up the voltage to the converter could damage it.
Further looking at the data sheet did not provide any other answers to why this might occur. There's nothing in my setup that stands out as a potential cause for this behavior. Any insight into this issue would be greatly appreciated.
-Devon
