High-side switch targets Industry 4.0 inductive loads

Article By : Graham Prophet

The MAX14913 can discharge and demagnetise inductive load safely via its integrated clamps and also provides open-wire and short-circuit diagnostics.

Maxim Integrated has introduced MAX14913, which provides high speed switching and demagnetising clamps that allow designers of industrial controllers to safely drive and demagnetise any inductive load for Industry 4.0 applications.

With a safe-demagnetising 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-demagnetisation feature, the MAX14913 can discharge and demagnetise any inductive load safely via its integrated clamps. It also 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 640mA 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 200kHz improves system speed by >15×; the part handles 24V (nominal)/36V (max) loads at up to 0.5A with minimum delay. As well as the integrated safe-demagnetisation clamps on outputs, each output is also protected against 1kV of surge. The octal configuration reduces board space by 40% compared to other solutions, while its diagnostic capabilities reduce downtime.

In a 56-pin QFN package (8mm × 8mm × 0.8mm) and specified over the -40 to 125°C temperature range, pricing starts at $6.95 (1,000). MAX14913EVKIT calls up the accompanying evaluation kit.

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