Thursday 27 October 2016

Using Switching Regulators to Make Split Supply



I am trying to use two switch-mode regulators to create a split supply, where the first one regulates the positive voltage as per the application schematic in the datasheet and the second one works the same way, but references its output to GND and uses the GND pin as the negative voltage output. Is this valid? Here is my schematic:


Schematic



Answer



You can make an LM2576 produce a negative regulated voltage - read the data sheet: -


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You need to follow the circuit above to make it work this. A lot of buck regulators can be "pushed" into this mode of operation BTW such as this one from LT: -


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Or this one: -


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Some SEPIC controllers can also be used this way: -



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