Hello, Cross-border King is honored to answer your questions: The official website of Facebook is: www.facebook.com. You can enter this URL directly into the address bar of your browser to access it, but if you are in mainland China,. What do the pin diagram symbols vin, bst, sw, fb, en mean? 1. This is the control pin mark of the switching power supply chip: 1. en enable pin, generally a high level makes the chip work. 2. vin power input 3. bs self-boost pin, 4. sw switch control pin 5.
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