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-15 vdc Switching power supply

Other Parts Discussed in Thread: TL497A

Hi: I'm using the TL497A and would like to use the same type of part (COT), but at a higher operating frequency, as to reduce the component size. Low ripple is a must. I need a part to convert +15 vdc to -15vdc (in some cases +15vdc to -12vdc). Any help would be appreciated. Regards, Don