Circuit Power Supply

Current-limit switches are virtually ubiquitous in system controls. They provide a safe means for regulating the current delivered to a load circuit. The switches allow the load current to increase to a programmed limit but no higher. This application note illustrates the implementation of a digitally programmable current-limit switch using MAX890L a current-limited, high-side P-channel switch and MAX5160 digital potentiometer

Read More Source:
http://www.maxim-ic.com/appnotes.cfm/appnote_number/298/ln/en

The current-limit circuit in Figure 1 allows you to establish the setpoint by applying a voltage to one of the amplifier’s pins. With this design, it is possible to set the current-limit point with the output of a DAC, possibly under the control of an embedded µC. The OPA547 is a true op amp; thus, it does not need a connection to power ground.

Source:http://www.edn.com/archives/1998/111998/24di.htm

The circuit in Figure 1 shows how a thermistor applies temperature compensation to the circuit’s output-current limit. The MAX1714’s linear current-limit (ILIM) input range at Pin 6 of IC1 spans 0.5 to 2V, which corresponds to current-limit thresholds of 50 to 200 mV, respectively.

Source: http://www.edn.com/article/CA6262538.html