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ucc3804的6脚输出为什么要加18伏稳压管

Other Parts Discussed in Thread: UCC3804

工程师们你们好,为什么ucc3804的6脚输出经过100欧电阻后,还要zmm18稳压管稳压,为什么选择这么高电压18伏?请看附件图片