,我通常用Zener diode 並聯(lián)在輸出端來(lái)用.這樣用不知大家有沒(méi)有更多的意見(jiàn),還有通常出現(xiàn)問(wèn)題,Zener 100%是開(kāi)路還是短路?用 500mW Zener 作輸出OVP時(shí),故障時(shí),是100%開(kāi)路還是短路?
各路英雄豪傑,在設(shè)計(jì)開(kāi)關(guān)電源時(shí)通常最經(jīng)濟(jì)的方法是用什麼作輸出OVP,,我通常用Zener diode 並聯(lián)在輸出端來(lái)用.這樣用不知大家有沒(méi)有更多的意見(jiàn),還有通常出現(xiàn)問(wèn)題,Zener 100%是開(kāi)路還是短路?
,我通常用Zener diode 並聯(lián)在輸出端來(lái)用.這樣用不知大家有沒(méi)有更多的意見(jiàn),還有通常出現(xiàn)問(wèn)題,Zener 100%是開(kāi)路還是短路?全部回復(fù)(6)
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@powerint_emi
主要與電源在開(kāi)路短路時(shí)的輸出能量有關(guān)系.如輸出能量很少,Zener就可以保持穩(wěn)定.
According my experiences, it shoould be short, but you can try and evaluate it.
Even if short, you still check your circuit can withstand the overload or not, else you need to improve your overcurrent protection, so that your circuit can reduce the output power during the output short.
Even if short, you still check your circuit can withstand the overload or not, else you need to improve your overcurrent protection, so that your circuit can reduce the output power during the output short.
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PI的Tinyswitch第三代產(chǎn)品具有初級(jí)側(cè)檢測(cè)輸出過(guò)壓并進(jìn)行保護(hù)的功能,請(qǐng)參考附件的文件說(shuō)明.1151028295.pdf
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@xiaoping.chu
Accordingmyexperiences,itshoouldbeshort,butyoucantryandevaluateit.Evenifshort,youstillcheckyourcircuitcanwithstandtheoverloadornot,elseyouneedtoimproveyourovercurrentprotection,sothatyourcircuitcanreducetheoutputpowerduringtheoutputshort.
建議是個(gè)好建議,但不是每一經(jīng)濟(jì)形的產(chǎn)品都會(huì)設(shè)計(jì)有專門的過(guò)流保護(hù)和過(guò)壓保護(hù),在adapter and charger 這個(gè)行業(yè)中,成本是越來(lái)越低,所以一般人會(huì)選擇PWM的方案,直接用IC的OCP,OVP來(lái)做,所以O(shè)VP就用了最經(jīng)濟(jì)的 zener在輸出端,
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