STMicroelectronics has introduced the IPS1025HF fast-start high-side power switch targeted for safety systems requiring extremely short power-on delay times. The IPS1025HF's on-off response time is less than 60µs, even taking into account Vcc power on and off conditions, ensuring that the safety protection system achieves the specified Safety Integrity Level (SIL). Supporting a wide-voltage input from 8.65V to 60V and a maximum withstand voltage of 65V on the input pins, this compact device can withstand harsh conditions in industrial applications. Target applications include programmable logic controllers (PLCs), vending machines, factory automation I/O peripherals, and power control for computer numerical control (CNC) machine tools.
Like similar single- and dual-channel products in the STMicroelectronics smart power switch family, the IPS1025HF also has two programmable current-limit settings, allowing the user to set a high current-limit value when the power switch is active, increasing load-driving flexibility , for example, applications such as light bulbs, motors, and capacitive loads require high initial peak currents.
The output stage is an N-channel power MOSFET with typical on-resistance Rds(on) of 12.5mOhm at ambient temperature, ensuring high switching efficiency and low thermal dissipation. The MOSFET internally limits the minimum output current to 2.5A, and the maximum single-pulse avalanche energy is 14J, which can handle inductive loads more reliably. The new product also internally integrates a fast demagnetization active clamp circuit.
The safety features of the switch include undervoltage protection, overvoltage protection, overload protection, short circuit protection, ground disconnection protection, and Vcc disconnection protection. On-chip diagnostic pins include independent output overload and junction overtemperature signals, and a thermal sensor is added to detect if the package temperature is too high. The device complies with IEC 61000-4-2 ESD, IEC 61000-4-4 and IEC 61000-4-5 ESD, fast transient and surge immunity test specifications.
In order to facilitate developers to quickly evaluate the performance of the device, the X-NUCLEO-OUT15A1 expansion board integrates IPS1025HF and related circuits, which can be directly plugged into the STM32 Nucleo development board. The development kit also includes STSW-OUT15F4 demo firmware package and STSW-IFAPGUI industrial automation system design GUI graphical user interface software, allowing users to implement a complete industrial automation environment on the desktop.
