![]() This is a vicious cycle and results with the voltage input to the regulator dropping to a very low value. Recall that I mentioned that the input current has to Increase when the input voltage drops. But: the resistance of the USB cable means that the input voltage decreases. ![]() The input current has to increase to handle increased load current. Now consider what happens when the load current increases. The opposite occurs when the input voltage decreases - the input current increases. If the input voltage increases, the input current decreases. For all intents and purposes and assuming a fixed load, you can consider the regulator to be a constant-power device. This is a very simplified explanation of what is going on. You have discovered the negative resistance feature that occurs with switch mode regulators.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |