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TPS82150: Generating a negative 5V from negative 15V

Part Number: TPS82150

I was planning to use two TPS82150 devices to generate +/-5V from +/-15V, and have been looking for an application note to generate negative 5V from my negative 15V rail.

I have seen the example Inverting Power Supply Schematic in Figure 30, but this doesn't work for me as +15V to -5V exceeds maximum supply voltage, and it is preferred that I use the -15V rail.

I just wondered if I was missing a simple solution?

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