Self-protected electronic fuse limits inrush currents

12 July 2006 Circuit & System Protection

On Semiconductor's NIS5112 integrated high-side switch features a Sensefet, which allows for current sensing, using inexpensive chip resistors instead of expensive, low impedance current shunts. A new member of its SMART HotPlug family, the NIS5112 is an integrated self-protected, resettable, electronic fuse that uses a high side N-channel FET, driven by an internal charge pump.

Designed to allow the safe insertion and removal of equipment into 12 V backplanes, the NIS5112 utilises an internal Sensefet that enables active current limiting via inexpensive chip resistors instead of more expensive, low impedance current shunts.

Coupled with an adjustable voltage slew rate, the designer has the versatility to select the level at which current is limited and the rate the output voltage comes up for multiple applications. The NIS5112 has an input voltage range of 9 V to 18 V and also provides overvoltage protection intended to allow operation through transients while protecting the load. It also contains circuits to control the turn-on voltage, output current, die temperature, turn-on di/dt and turn-on dV/dt, as well as an enable/timer function, and offers thermal protection in two different thermal limit versions, auto-retry and latch off.

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