随着宽带接入的到来，许多公司已经开发出了高高压SLIC （用户线路接口卡） ，控制振铃和语音传输电话系统。 SLIC组件基本上执行两个功能。一个正在振铃手机客户的处所。另一种是摘机操作回路电流产生。 SLIC组件的电源有特殊要求。Maxim > App Notes > Battery Management Power-Supply Circuits Keywords: SLIC, subscriber line interface card, SLIC power supply, REN, broadband, DSL, cable modem, power supply controller Nov 12, 2001 APPLICATION NOTE 850 Flyback Circuit Powers Broadband Phone Networks With the advent of broadband access, many companies have developed high voltage SLICs (subscriber line interface card) which control the ringing and voice transmission on phone systems. The SLICs essentially perform two functions. One is ringing the phone at the customer's premises. Another is generating loop current for off-hook operation. Power supplies for SLICs have special requirements. Multiple Line, Multiple Phone Applications Power Requirements The equivalent circuit for a US ringer, at the ringer frequency o……