Octal high-side switch & driver for ‘Industry 4.0’ inductive loads

November 21, 2016 // By Graham Prophet
Maxim Integrated’s MAX14913 provides ultra-high speed switching and demagnetizing clamps; designers of industrial controllers can safely drive and demagnetize any inductive load for Industry 4.0 applications.

With a safe-demagnetizing clamp on each output, the chip reliably interfaces low-voltage digital signals to 24V output-control lines. For most industrial applications, Maxim notes, engineers need a high-side switch to control inductive loads. The challenge is how to discharge the energy in the inductor when the switch opens and current flow stops. If the inductance and the resulting stored energy are high, a driver IC could be permanently damaged due to the resulting generated heat.

Using its safe-demagnetization feature, the MAX14913 can discharge and demagnetize any inductive load safely via its integrated clamps. For a more robust solution, it provides open-wire and short-circuit diagnostics, the most-common external failure mode. Its propagation delay enables higher system speed and throughput. Compared to its predecessor, the MAX14913 achieves 15x space savings by eliminating 16 diodes from its previous solution. In addition, it has eight 640 mA high-side switches that can also be configured as push-pull drivers for high-speed switching. Applications include programmable logic controllers (PLCs), motion control units, drives, and other industrial and process automation applications.

Switching at up to 200 kHz improves system speed by >15×; the part handles 24-V (nominal)/36-V (max) loads at up to 0.5 A with minimum delay. As well as the integrated safe-demagnetization clamps on outputs, each output is also protected against 1-kV of surge. The octal configuration reduces board space by 40% compared to other solutions, and diagnostic capabilities reduce downtime.

 

In a 56-pin QFN package (8 × 8 × 0.8 mm) and specified over the -40 to +125C temperature range, pricing starts at $6.95 (1000). MAX14913EVKIT calls up the accompanying evaluation kit.

 

Maxim; www.maximintegrated.com