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3ru2116-1kb0 

3ru2116-1kb0

能用PN結(jié)二極管的地方就用PN結(jié)二極管，因為價格便宜。

肖特基二極管的優(yōu)勢主要在速度和壓降，對這兩個沒要求的場景，那自然選擇更便宜的由PN結(jié)構(gòu)成的二極管。

下面說個在實際工作中可能忽視的點。

二極管導通電壓

提起二極管導通電壓，估計腦子里面都是0.7V，形成這個印象其實并不好，有4點原因。

1、 這個0.7V，說的是PN結(jié)二極管，肖特基二極管要更低。

我們經(jīng)常使用二極管串聯(lián)在電源支路上面，防止倒灌。

那你擔心過二極管上面壓降太大嗎？

其實你可能沒有注意，在對壓降有要求的地方，可能用的就是肖特基二極管，它的壓降有多低呢？

以BAT60BE237為例子吧，截個圖給大家看看。

你看，通過10mA的電流，壓降才0.24V。

對于一些小電流防倒灌的場合，電壓不能下降太多，肖特基二極管就比較實用了。如果工作電流更小，可能壓降才零點一幾伏。

所以，不要看到個電路中串了個二極管，就覺得這個壓降是0.7V。

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