Current-Limit Switch Is Digitally Programmable
Quick View Data Sheet for the MAX1983
Quick View Data Sheet for the MAX5160
- Technical Support: Power
Figure 1. You can program a current limit to 1A in 32 equal increments by using a digital potentiometer.
These transitions increase the resistance between W and L when U/active-low D is low and reduce it when U/active-low D is high. IC1 includes a thermal-shutdown capability that turns the load current completely off when the chip temperature exceeds 135°C. It restores the load current when the temperature cools by 10°C. If the short-circuit fault is still present, the switch cycles off and on, yielding a pulsed load current. An open-drain fault output (pin 8) switches low when the load demands current beyond the programmed limit, enabling an external system to monitor the condition of the current switch.
A similar version of this article appeared in the August 17, 2000 issue of EDN.