I have an LDO TPS7B69 which takes in up to 40V DC and regulates it to 5V. This LDO typically takes in DC, but I would also like it to be powered by AC 40 volts peak max at 50Hz or greater.
Rectification would first come to mind, and I would prefer using a full bridge rectifier since it will utilize both positive and negative cycle thus not needing huge caps values, which also help against Reverse Input protection (?) when using DC. But I do not know if a DC input on the FBR would also yield a DC output. I personally think it would work since it would just be like a peak voltage on an AC.
Is my approach acceptable? Are there any better ways to do this?