The fast start load switch of the safety system has the minimum delay response | Heisener Electronics
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The fast start load switch of the safety system has the minimum delay response

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Date de Parution: 2022-09-06, STMicroelectronics

STMicroelectronics released the IPS1025HF fast-start high-side power switch for safety systems requiring minimum power-on delay time. The switch includes undervoltage protection, overvoltage protection, overload protection, short circuit protection, ground protection, and Vcc disconnection protection. On-chip diagnostics include outputting a single signal for overload and junction overtemperature, with an additional thermal sensor to detect excessive case temperature. The device meets IEC 61000-4-2 ESD, IEC 61000-4-4 and IEC 61000-4-5 ESD, fast transient and surge immunity specifications.

The switch responds to turn-on and turn-off signals below 60 μs, allowing the protection system to provide the specified SIL, even taking into account the turn-on and turn-off of Vcc. This compact device withstands harsh industrial operating conditions, offers a wide input voltage range from 8.65V to 60V, and tolerates voltages up to 65V on the input pins. Applications include power control for PLCs, vending machines, factory automation I/O peripherals, and CNC machine tools.

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

Like similar single-channel and dual-device devices in the company's family of smart power switches, the switch has two programmable current-limit settings, allowing users to program higher current-limit values ​​when the power switch is activated. This increases the flexibility to drive loads, including light bulbs, motors, and capacitive loads that require high initial peak currents.

For quick evaluation, the x-Nucleo out15a1 expansion board contains an IPS1025HF with associated circuitry ready to be connected to the STM32 Nucleo development board. A demo firmware package STSW-OUT15F4 and industrial automation system design GUI STSW-IFAPGUI are also provided, allowing users to implement the entire industrial automation environment on the desktop.

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