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This module is a step-up and step-down converter and the performance is better than LM2596 and LM2577. -This module doesn't have reverse protection if you connect reversely it will be burned. Please pay more attention. -When the output is in shot the output will be automatically stopped. Pull and plug the enable interface cap can make module become normal. - Output voltage will beyond preset voltage for short when module is unload start or load off thus the module is not suitable for the device which is sensitive to voltage.