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35个回答
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我不太明白，IOUT正常工作时是正电压，最右边的那个二极管正向导通把IOUT短接到地了，这个电路好像没法正常工作啊 |
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我不太明白，IOUT正常工作时是正电压，最右边的那个二极管正向导通把IOUT短接到地了，这个电路好像没法正常工作啊 |
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TⅤS管有双向保护的，查查具体型号，即使是单向的如果输出电压控制在小于0.5V也没有问题，估计是电流输出的负端，24mA电流通过15Ω电阻到地，两TⅤS管处电压远小于0.5V
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zwx_zhang 发表于 2017-2-2 22:47 IOUT的电压在20V左右 |
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zwx_zhang 发表于 2017-2-2 22:47 IOUT输出电压在20v左右 |
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是我的笔误，抱歉，你看一下，那不是反向并联，其中一个是正向接地 |
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直接请教一下老外，看看老外怎么解释，老外会不会搞错啊
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哈哈，看来我们真的说不到一块儿，不能再往下说了。我只有退出了。 |
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下面是老外的解释：
Some TVS diodes are constructed as, basically, a zener diode with a series standard diode facing opposite directions. In such a structure the zener does not break down until the required reverse breakdown voltage is applied along with the forward voltage associated with the series standard diode. In the other direction the standard diode must achieve reverse breakdown for conduction to occur, which is generally a fairly high voltage. It comes down to what is in the particular diode datasheet. If the TVS diode is not constructed as described above and had low forward voltage then your statements are true and the diode would conduct once the voltage at IOUT were sufficiently high to forward bias the diode on the right. |
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下面是老外的解释：
Some TVS diodes are constructed as, basically, a zener diode with a series standard diode facing opposite directions. In such a structure the zener does not break down until the required reverse breakdown voltage is applied along with the forward voltage associated with the series standard diode. In the other direction the standard diode must achieve reverse breakdown for conduction to occur, which is generally a fairly high voltage. It comes down to what is in the particular diode datasheet. If the TVS diode is not constructed as described above and had low forward voltage then your statements are true and the diode would conduct once the voltage at IOUT were sufficiently high to forward bias the diode on the right. |
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右边两个是反向并联的，对不对要看输出端的电阻了，最大24mA产生的压降小于俩管的正向压降就是对的，起限压作用，如果远大于俩管正向压降，就说明是错误的，除非管的正向压降高于后级电压
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