Dual-Output SLIC Supply Shares
abstract: dual output subscriber line-interface cards (slic) flyback power supply using feedback sharing to regulate both outputs.
additional information: quickviewdatasheet for the max668
technical support: powerfor some subscriber line-interface cards (slics), both the line and the ringer voltages should be regulated under all conditions. the circuit shown in the figure below meets this requirement. it accepts a 12v ±10% input, and it delivers 0ma to 400ma from a regulated -24v ±5% output. from a regulated -75v ±5% output, it provides 0ma to 100ma. features of this circuit include a boost-controller ic in a transformer-flyback topology and an op amp in the inverting configuration. used as a summing amplifier, this op amp derives shared feedback from the two regulated outputs. the transformer turns ratio is approximately 1:2:4.
both outputs must remain in regulation even when one operates at full load and the other operates at no load. to ensure that this happens, the two outputs contribute to the ic's feedback signal. the -24v output generates the greater output power and two-thirds of the feedback current. meanwhile, the -75v output provides the remaining one-third of the feedback current.
such an arrangement allows the regulator to maintain a ±5% output-voltage tolerance on both outputs—for line variations of ±10%, and for any combination of output currents (i.e., zero to full load on either output). for full-load currents at both outputs and a 12v input, the efficiency is 85%.
notes:
t1: coiltronics ctx01-14853 or equivalent.
the general specs are:
primary l = about 22 µh (not critical).
primary current rating ≥ 6.7a, turns ratio 1:2:2:2.
q1: any logic-level (ron rated at 5v) n-fet with similar ratings may be substituted.
using a combined feedback signal from its two regulated outputs, this power supply for subscriber line-interface cards maintains ±5% regulation on both outputs.
a similar version of this article appeared in the august 7, 2000 issue of electronic design.
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additional information: quickviewdatasheet for the max668
technical support: powerfor some subscriber line-interface cards (slics), both the line and the ringer voltages should be regulated under all conditions. the circuit shown in the figure below meets this requirement. it accepts a 12v ±10% input, and it delivers 0ma to 400ma from a regulated -24v ±5% output. from a regulated -75v ±5% output, it provides 0ma to 100ma. features of this circuit include a boost-controller ic in a transformer-flyback topology and an op amp in the inverting configuration. used as a summing amplifier, this op amp derives shared feedback from the two regulated outputs. the transformer turns ratio is approximately 1:2:4.
both outputs must remain in regulation even when one operates at full load and the other operates at no load. to ensure that this happens, the two outputs contribute to the ic's feedback signal. the -24v output generates the greater output power and two-thirds of the feedback current. meanwhile, the -75v output provides the remaining one-third of the feedback current.
such an arrangement allows the regulator to maintain a ±5% output-voltage tolerance on both outputs—for line variations of ±10%, and for any combination of output currents (i.e., zero to full load on either output). for full-load currents at both outputs and a 12v input, the efficiency is 85%.
notes:
t1: coiltronics ctx01-14853 or equivalent.
the general specs are:
primary l = about 22 µh (not critical).
primary current rating ≥ 6.7a, turns ratio 1:2:2:2.
q1: any logic-level (ron rated at 5v) n-fet with similar ratings may be substituted.
using a combined feedback signal from its two regulated outputs, this power supply for subscriber line-interface cards maintains ±5% regulation on both outputs.
a similar version of this article appeared in the august 7, 2000 issue of electronic design.
绘王智慧课堂：做好“加减法”，为教学创新增效
瑞芯微RK1808人工智能计算棒——一款物美价廉的深度学习开发工具
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基于FPGA采用模块化思路设计一个译码器
Dual-Output SLIC Supply Shares
百度特立独行押注AI 跃升BAT人工智能巨头
沃达丰计划在该国的15个城市推出首张商用5G网络
全热交换器安装方法
如何实现数控系统内嵌式软PLC编辑器的设计
华进半导体先进封装项目建设迈出关键一步
wargame玩具枪
工业镜头景深计算及工业镜头技术分析
到底哪些无人机电池用着安全？你得知道这些呀！
苹果未来或将采用环绕式显示屏，甚至边框增添触感控制功能
什么是EMS储能管理系统/如何实现对光储新能源集中管理控制？
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