Subscriber line interface circuit is an important part of digital program-controlled switching system.
模拟用户线接口电路是数字程控交换系统的重要组成部分。
Stay ILD card processing after drying test and found do veneer ILD card switching power supply circuit, drive the trigger line work normally work normally.
待ILD卡处理的烘干后做单板测试，发现ILD卡开关电源线路工作正常，驱动触发线路也工作正常。
For the use of off-line switching mode power supply IC, an internal power supply circuit combining with a high voltage startup current source is proposed.
结合高压启动恒流源设计了一种用于离线式开关电源的内部电源电路。
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