STMicroelectronics has added new 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 standardized requirements for interface types C and D in Safety Integrity Level (SIL) Class 3 applications.
Featuring a wide input-voltage range of 8 V-60 V, maximum switch resistance (RDS(on)) of 120 mΩ, and 10 µs rise/fall time with 20 µs propagation delay, these devices combine design flexibility, low power dissipation, and fast response. Extended diagnostics facilitate the design of safety-instrumented functions by indicating open load, over-current cut-off, and over-temperature shutdown.
The IPS160HF and IPS161HF 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.
As intelligent power switches, the IPS160HF and IPS161HF 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 minimizes overheating.
The IPS160HF and IPS161HF are in production now and available in the thermally enhanced PowerSSO12 package from $1.49 for orders of 1,000 units.
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| Industrial digital output expansion board based on IPS160HF for STM32 Nucleo. |
