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《电子制作》96年第5期刊登了张义方先生对95年9期“智能电话线路控制器”一文的纠错及改进意见,读后很受启发。但文中有些概念似有商榷的必要。在文中,“2.…流过D6的电流不足10mA,而一般稳压管的工作电流Iz≥5mA…如此小的Iz电流,D6不发生齐纳击穿”是不对的。的确,稳压管技术指标中有一项“工作电流”Iz,通常要求Iz为5～10mA。这是因为当Iz大于此值时稳压管的动态电阻已趋于较小的值(如2CW7C,当Iz=5mA时r_z为18Ω;10mA时为8Ω;20mA时为2Ω),因而能呈现出较好的稳压效
“Electronic Production” No. 5, 96 published Zhang Yifang on 95 years 9 “smart phone line controller,” a correction and improvement of the article, read very inspired. However, some concepts in the paper seem to be in need of discussion. In this article, “2. ... the current through D6 is less than 10mA, whereas the normal zener current Iz ≥ 5mA ... so small Iz current, D6 does not occur Zener breakdown” is wrong. Indeed, there is a “working current” Iz in the technical indicator of the regulator, which usually requires Iz as 5 ~ 10mA. This is because the zener’s dynamic resistance tends to be smaller when Iz is greater than this value (eg, 2CW7C, r_z is 18Ω for Iz = 5mA; 8Ω for 10mA; 2Ω for 20mA) Better voltage regulation effect