Application Note 298: 2000 Current-Limit Switch Digitally Program
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Application Note 298: 2000
Current-Limit Switch Digitally Programmable Current-limit switches virtually ubiquitous system controls. They provide safe means regulating current delivered load circuit. switches allow load current increase programmed limit higher. This application note illustrates implementation digitally programmable current-limit switch using MAX890L current-limited, high-side P-channel switch MAX5160 digital potentiometer
Additional Information: Quick View Data Sheet MAX890L Additional Information: Quick View Data Sheet MAX5160 Additional Information: Samples Literature Order Form Additional Information: Powerhelp@design.mxim.com Current-limit switches virtually ubiquitous system controls. They provide safe means regulating current delivered load circuit. switches allow load current increase programmed limit higher. Typically, current limit function voltage across external resistor, produced current from fixed source internal switch This voltage serves reference internal current-limiting amplifier. replacing resistor with digital potentiometer, easily program current limit (see figure below). current-limit switch with maximum programmable limit limit equals 1380/RSET, where RSET resistance between pins IC2. digital potentiometer whose resistance programmable equal increments. With held (pin increments IC2's internal counter. low, high-to-low transitions
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program current limit equal increments using digital potentiometer.
These transitions increase resistance between when reduce when high. includes thermal-shutdown capability that turns load current completely when chip temperature exceeds 135°C. restores load current when temperature cools 10°C. short-circuit fault still present, switch cycles yielding pulsed load current. open-drain fault output (pin switches when load demands current beyond programmed limit, enabling external system monitor condition current switch. similar version this article appeared August 2000 issue EDN.
MORE INFORMATION MAX5160: QuickView Full (PDF) Data Sheet (264k) Free Sample MAX890L: QuickView Full (PDF) Data Sheet (744k) Free Sample
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