STMicroelectronics IPS1025HF fast-starting high-side power switch

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STMicroelectronics has introduced the IPS1025HF fast-starting high-side power switch for use in safety systems that require minimal power-on delay time.

The power switch is designed to respond to turn-on and turn-off signals in less than 60 µs even considering the Vcc power-on and off, enabling protective systems to provide a specified safety-integrity level (SIL). Featuring a wide input-voltage range from 8.65 to 60 V and able to tolerate up to 65 V on the input pin, the devices are designed to withstand harsh industrial operating conditions. Applications include power control for programmable logic controllers (PLCs), vending machines, factory-automation I/O peripherals and computer numerical control (CNC) machines.

Like similar single-channel and dual devices in ST’s intelligent power switch family, the IPS1025HF has two programmable current-limit settings that allow the user to program a higher current limitation value at power switch activation. This enhances flexibility for driving loads such as bulb lamps, motors and capacitive loads that require high initial peak current.

The output stage is an N-channel Power MOSFET with a typical Rds(on) of 12.5 mOhm at ambient temperature, for high energy efficiency and low thermal dissipation. The MOSFET is internally limited at 2.5 A minimum output current and has single-pulse avalanche energy up to 14 J, which boosts reliability for handling inductive loads. There is also an integrated active clamp for fast demagnetisation.

The switch includes protection against undervoltage, overvoltage, overload, short circuit, ground disconnection and Vcc disconnection. On-chip diagnostics include individual signalling of output overload and junction overtemperature and there is an extra thermal sensor to detect excessive case temperature. The device is designed to meet IEC 61000-4-2 ESD, IEC 61000-4-4 and IEC 61000-4-5 specifications for ESD, fast-transient and surge immunity.

For fast evaluation, the X-NUCLEO-OUT15A1 expansion board contains an IPS1025HF with associated circuitry ready to connect to STM32 Nucleo development boards. A demonstration firmware pack, STSW-OUT15F4, and industrial-automation system design GUI, STSW-IFAPGUI, are also available, thereby providing an entire industrial-automation environment on the desktop.

The power switch is in production now, available in both PowerSSO-24 and QFN48L packages.

For more information, visit www.st.com/ips/hss.