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. Breakfast bb: bed & breakfast (accommodation and morning), which means accommodation includes breakfast; half board hb: half board (half meal), breakfast + lunch or dinner, most people choose breakfast and dinner. Full meal fb: full board (full meal), breakfast + lunch + dinner. . 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,.
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