Fast-starting load switch responds swiftly for safety systems

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

The IPS1025HF responds to turn-on and turn-off signals in less than 60 micro seconds even considering the Vcc power-on and off, enabling protective systems to ensure a specified safety-integrity level (SIL). The wide input voltage ranges from 8.65 to 60V and able to tolerate up to 65V on the input pin and withstand harsh industrial operating conditions. 

The switch is suitable for applications such as power control for programmable logic controllers (PLCs), vending machines, factory automation I/O peripherals, and computer numerical control (CNC) machines.

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 demand high initial peak current.

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

The switch includes protection against under-voltage, over-voltage, over-load, 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.

ST also offers the X-NUCLEO-OUT15A1 expansion board which contains an IPS1025HF with circuitry ready to connect to STM32 Nucleo development boards. There is also a demonstration firmware pack, STSW-OUT15F4, and industrial-automation system design GUI (graphical user interface), STSW-IFAPGUI, are also available and enable users to realise an industrial automation environment on the desktop.

The IPS1025HF is in production now, available in both PowerSSO-24 and QFN48L packages.

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