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.

Further reading:

EMC limits and levels
Altron Arrow Editor's Choice Circuit & System Protection
As soon as electronics and electrical systems started interfering with each other, the world had to come to some consensus. Considering physics is universal and does not care about what country electrical/electronic products are used in, it should be the same everywhere, right? It is nearly there, but not quite.

Read more...

---

Clearing the Static: The importance of cleaning in ESD control
Circuit & System Protection
The proper cleaning of ESD-safe areas and equipment such as workstations, floors, mats, trays, and tools using specialised antistatic cleaners is vital to prevent ESD damage.

Read more...

---

Safety relay for explosive areas
IOT Electronics Circuit & System Protection
Phoenix Contact has expanded its safety portfolio with the new PSR-MC35-EXI safety relay module, specifically engineered for use in potentially explosive environments.

Read more...

---

Clearing the Static: Ensuring effective ESD control
Actum Circuit & System Protection
To maintain reliable electrostatic discharge control, regular testing and accurate measurement are essential, with grounding products and ESD testing equipment being vital.

Read more...

---

Clearing the Static: The importance of ESD audits
Actum Circuit & System Protection
An ESD audit is the first step in establishing an effective static control programme in the workplace, and will help identify vulnerable areas and potentially hazardous static zones that require improvement.

Read more...

---

EMI shielding materials application guide
Circuit & System Protection
TE Connectivity’s shielding solutions include electrically conductive elastomers, gaskets, knitted wire mesh, oriented wire, EMI shielding ventilation panels, shielded window, cable shielding and shielding components.

Read more...

---

Clearing the Static: ESD containers and packaging
Actum Circuit & System Protection
         Vacuum forming ESD Electronic components can be damaged by electrostatic discharges. To protect against such damage, electronic assembly parts are often transported or stored in vacuum formed component ...

Read more...

---

Electrostatic discharge chairs
Actum Circuit & System Protection
An ESD chair forms an integral part of grounding within the electrostatic discharge protected area to prevent potential damage to products.

Read more...

---

Conductive ESD footwear
Actum Circuit & System Protection
Conductive ESD footwear is used in conjunction with other grounding devices, such as a wrist strap, cord, and ESD surface mats, to provide a continuous path to ground.

Read more...

---

Clearing the Static: The importance of cleaning in ESD control
Actum Circuit & System Protection
To prevent Electrostatic Discharge (ESD) damage to sensitive electronic assemblies and components, all production, handling, packaging, and storage must take place in an ESD-protected environment.

Read more...

---