Potato Cakes
Well-known member
Hello,
I have a single power source audio circuit that am incorporating with a couple of other circuits using ICs, so I am using a bipolar SMPS to power the whole unit, running the single power source (+V, 0V) circuit off of the +V,-V. My initial testing with this scheme works great, but issue I am running into is the SMPS is sensing the current draw of the whole unit is too much, causing it to cycle on/off. The power supply is rated for 700mA for V+ and 700mA for V-. The current draw for the entire unit is about 360mA, so I should be well with in the capacity of the power supply. When I rewire the single source circuit to be +V and 0V, the power supply works fine. I tested with a bigger SMPS that was double the current rating and it worked fine with the bipolar scheme mentioned above.
My question pertains solely to the SMPS amp rating. My understanding is that the 700mA listed on the power supply pertains to +V to 0V and -V to 0V. Would the amp rating be different between +V and -V? That seems to be the case with what I am experiencing but I do not quite understand why.
Thanks!
Paul
I have a single power source audio circuit that am incorporating with a couple of other circuits using ICs, so I am using a bipolar SMPS to power the whole unit, running the single power source (+V, 0V) circuit off of the +V,-V. My initial testing with this scheme works great, but issue I am running into is the SMPS is sensing the current draw of the whole unit is too much, causing it to cycle on/off. The power supply is rated for 700mA for V+ and 700mA for V-. The current draw for the entire unit is about 360mA, so I should be well with in the capacity of the power supply. When I rewire the single source circuit to be +V and 0V, the power supply works fine. I tested with a bigger SMPS that was double the current rating and it worked fine with the bipolar scheme mentioned above.
My question pertains solely to the SMPS amp rating. My understanding is that the 700mA listed on the power supply pertains to +V to 0V and -V to 0V. Would the amp rating be different between +V and -V? That seems to be the case with what I am experiencing but I do not quite understand why.
Thanks!
Paul