STMicroelectronics IPS160HF and IPS161HF intelligent power switches

Click2Contact

STMicroelectronics has added fast-starting devices to its family of intelligent power switches for safety-instrumented systems. With power-on delay time of less than 60 µs, the IPS160HF and IPS161HF satisfy standardised requirements for interface types C and D in Safety Integrity Level (SIL) Class 3 applications.

Featuring a wide input voltage range of 8–60 V, maximum switch resistance (RDS(on)) of 120 mΩ and 10 µs rise/fall time with 20 µs propagation delay, the devices combine design flexibility, low power dissipation and fast response. Extended diagnostics facilitate the design of safety-instrumented functions by indicating open load, overcurrent cut-off and overtemperature shutdown.

The switches safely drive complex resistive, capacitive and inductive loads with one side connected to ground, such as valves, relays and lamps. In addition to SIL-rated applications such as safety sensors, they can be used in general factory-automation and process-control equipment such as programmable logic controllers (PLCs), I/O peripherals and computer numerical control (CNC) machines.

The intelligent power switches integrate a logic interface, driving circuitry, various protection features and an N-channel power-MOSFET output stage. The output stage is internally limited at 2.5 A minimum output current for the IPS160HF and 0.7 A for the IPS161HF. Both devices withstand an applied supply voltage of up to 65 V and integrate active-clamp circuitry for handling inductive loads.

Built-in safeguards include ground-disconnect and VCC-disconnect protection, thermal shutdown, undervoltage lock-out and short-circuit cut-off to protect the IC, the application and the load against overstress. The cut-off acts after a delay time, which is programmed with an external capacitor, and provides non-dissipative protection that minimises overheating.

For more information: http://www.st.com/ipshf-pr.