bacoezhang:
[圖片] 能否說詳細點兒呢,比如上面這個主邊反饋電路。TheAP3706includesoutputover-voltageprotection(OVP)andopencircuitprotection(OCkP)circuitryasshowninFigure14.IfthevoltageatFBpinexceeds8V,100%abovethenormaldetectionvoltage,orthe-0.7VfallingedgeoftheFBinputcannotbemonitored,theAP3706willimmediatelyshutoffandentershiccupmode.TheAP3706sendsoutafaultdetectionpulseevery8msinhiccupmodeuntilthefaulthasbeenremoved.它上面這段話,我的理解是當反饋端電壓超過8V時,是過壓保護,感覺應該是沒有負載的時候或者其他什么情況導致的。而-0.7V沒探測到的情況下,的保護應該就是開路保護,可是我找不出什么原因來,幫幫俺吧。謝謝了!