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Power/Alternative Energy  

Simple current limiter is programmable

Posted: 18 Jan 2011     Print Version  Bookmark and Share

Keywords:current limit  chargepump  current-sense amplifier 

The circuit described in this application note lets you program a current limit without using microcontrollers or data converters. It consists of a chargepump voltage doubler (U1), a current-sense amplifier (U2), and two n-channel MOSFETs. The sense resistor value determines the maximum current limit.

Available integrated circuits can let you program a current limit, but they generally involve microcontrollers or data converters (or both). As an alternative, the circuit described in this application note lets you program a current limit without the intervention of microcontrollers or data converters. It consists of two miniature SOT-5 devices and a few external components. The sense-resistor value determines the maximum current limit.

View the PDF document for more information.





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