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The chip models on the Mi 5v1a power adapter are U6117 and U6217. The U6117 is used on the 5V 1A power adapter. The U6117 is a multi-mode, high-precision primary-side feedback control (PSR) constant-current and constant-voltage (CC\/CV) controller. The chip has a built-in power MOS in a DIP-8 package that minimizes the number of system components and uses frequency modulation to improve system efficiency and reduce electromagnetic interference.