Use Flyback or SEPIC topology instead of the XL7015.

cyber-murmel / ottercontrol

Hardware files for OtterControl BLDC motor controller

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Use Flyback or SEPIC topology instead of the XL7015. #2

Open cyber-murmel opened 5 years ago

cyber-murmel commented 5 years ago

The XL7015 works fine, however it is not short-circuit proof and misbehaves when overloaded. As most buck-converters, this chip fails by shorting the main switching transistor, applying VBUS to the input of the ACT4088 which also kills every single semiconductor of the board. A flyback topology with a dedicated transformer would improve this behavior.

https://github.com/NiklasFauth/ottercontrol/pull/5#issuecomment-451672617

Wikipedia Flyback Wikipedia SEPIC

cyber-murmel commented 4 years ago

Preferably SEPIC, since small transformers or coupled inductors seem harder to come by than ordinary inductors.

cyber-murmel commented 4 years ago

LM5001 seems to be a good candidate. (see page 16 "12-V Automotive SEPIC") Also there already is a KiCAD symbol "LM5001MA".

cyber-murmel commented 4 years ago

Another promising option is the LM3481. lm3481_SEPIC