Derive simple high-current sou
comprising a standard force-sense lab power supply, an additional power supply for the ics, and a separate control voltage, this adjustable current source provides a 1-to-1 ratio of control voltage to load current (1a/v).
a similar version of this article appeared in the october 16, 2008 issue of edn magazine.
when electronic testing requires an adjustable current source, you must often build that piece of test equipment in the lab. you can easily make such a current source from a standard force-sense lab power supply (figure 1). the circuit requires an additional power supply for the integrated circuits, and a separate control voltage.
figure 1. adding these components to a standard force-sense lab supply makes a simple voltage-controlled current source. as configured, the circuit produces a control ratio of 1:1 amperes per volt.
the feedback signal to the force-sense supply is derived from a high-side current monitor (max4172). in the configuration shown, the circuit offers a 1-to-1 ratio of control voltage to load current (1a/v). load current as a function of load resistance is shown in figure 2.
figure 2. load current vs. load resistance for the figure 1 circuit.
to change the voltage/current ratio, simply change rshunt: a lower value of rshunt gives higher current, and vice-versa. output current is limited by the maximum allowed voltage (150mv) between the rs+ and rs- terminals, the maximum rs+ voltage (32v), and of course, the maximum current capability of the force-sense supply.
because voltage and current meters built into the force-sense supply will display inaccurate values while this circuit is operating, you should use external meters to monitor the load voltage and load current. also, be aware that if the load is removed (iout = 0), the open-circuit voltage of the force-sense supply goes to the maximum value it can generate.
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Derive simple high-current sou
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a similar version of this article appeared in the october 16, 2008 issue of edn magazine.
when electronic testing requires an adjustable current source, you must often build that piece of test equipment in the lab. you can easily make such a current source from a standard force-sense lab power supply (figure 1). the circuit requires an additional power supply for the integrated circuits, and a separate control voltage.
figure 1. adding these components to a standard force-sense lab supply makes a simple voltage-controlled current source. as configured, the circuit produces a control ratio of 1:1 amperes per volt.
the feedback signal to the force-sense supply is derived from a high-side current monitor (max4172). in the configuration shown, the circuit offers a 1-to-1 ratio of control voltage to load current (1a/v). load current as a function of load resistance is shown in figure 2.
figure 2. load current vs. load resistance for the figure 1 circuit.
to change the voltage/current ratio, simply change rshunt: a lower value of rshunt gives higher current, and vice-versa. output current is limited by the maximum allowed voltage (150mv) between the rs+ and rs- terminals, the maximum rs+ voltage (32v), and of course, the maximum current capability of the force-sense supply.
because voltage and current meters built into the force-sense supply will display inaccurate values while this circuit is operating, you should use external meters to monitor the load voltage and load current. also, be aware that if the load is removed (iout = 0), the open-circuit voltage of the force-sense supply goes to the maximum value it can generate.
安装手机信号屏蔽器的注意事项
创新设计四合一高集成度的电源管理芯片——CN8911B
区块链技术与电子文件融合的好处是什么
紫光集团存储产业有了最新进展
看懂电气图纸的三个重要步骤
Derive simple high-current sou
三款新iPhone的试产工作非常顺利，国行双卡双待 6499元起
加密货币具备怎样的缺点
三大运营商期待3G突破：ARPU难题待解
无刷直流电机电路图
产业分析:无晶圆厂/晶圆代工模式还能存活好久
Oppo为迎接5G最新推出智能语音系统
multus cni是什么？k8s多网卡方案之multus用法介绍
交流供电的特殊性和PF与PFC及PPFC和APFC的详细介绍
MEMS空气声矢量传感器
美汽车工会1.8万人罢工，汽车供应链受重创
魅族PRO6s六个月打磨，你就给我看这个？
电子门锁,Electronic Lock
AI专家：GPT-3的性能令人惊叹，但存在规模和缺乏透明度等问题
恒大首款电动汽车将于今年6月在天津基地投产