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AC/DC and Isolated DC/DC Power
AC/DC and Isolated DC/DC Power Forum
17.0V to 15.0V isolated and non-isolated power supply
From 17.0V DC supply I need to generate 15.0V at 500mA isolated power supply and 15.0V at 500mA non-isolated power supply both. I tried with WEBENCH Designer, but wasn't convinced with designs. Please suggest a TI/National part number with schematics if possible. Please refer the power supply tree below for clear reference.
Thanks and regards
In the future, I would recommend making this two separate posts since you want two very different power supplies. I moved this to the isolated forum, where they can help you choose a controller for your isolated need. A flyback would likely be the best option.
For the non-isolated power supply, an LDO would be simplest. The TPS7A4801, TPS7A4501, and TPS73801 all look like options.
On th eassumption that the 17 volts might drop I would recommend the UCC38C45
It is a flyback design and should be fairly simple to implement. With a 50% limitation on the duty cycle you should not have to implement slope compensation.
A resonable app note to review for your design is http://www.ti.com/lit/an/slua274a/slua274a.pdf
Since you are powering this from a 17 volt source you should be able to power it through a simple series regulator that results with VDD at 9 volts.
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