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ST Introduces Single-channel Load Switches


High-side switches enable the intelligent driving of capacitive, resistive, or inductive loads, with high startup current

STMicroelectronics has released single-channel versions of its programmable high-side switches, the IPS1025H and the IPS1025H-32. With built-in protection for undervoltage, overvoltage, overload, and overtemperature, they enable the intelligent driving of capacitive, resistive, or inductive loads, which draw high startup current.

The internally programmed current limit differentiates between the IPS1025H and IPS1025H-32. The IPS1025H limit is 2.5A and it is 5.7A in the IPS1025H-32. In addition to the main current limit, each switch has a secondary, user-programmable limit for handling capacitive loads with high initial startup current. The limit value and duration are set using external resistors and a capacitor.

Featuring a wide supply and input pin voltage range from 8V to 60V and able to withstand up to 65V on the input pin, the compact devices are said to ensure reliable performance in industrial applications. Typical uses for the IPS1025H include driving loads controlled by PLC modules and for use in factory-automation equipment such as I/O peripherals and CNC machines. The IPS1025H-32, with its higher maximum current limit, is well suited for use with unidirectional motors in equipment such as vending machines.

The integrated MOSFET switch has a low Rds(on) (≤ 25 mΩ up to TJ = 125 degC), resulting in high energy efficiency and low thermal dissipation. With single-pulse avalanche energy greater than 1J at 2A, the MOSFET boosts reliability for handling inductive loads. An integrated active clamp provides fast demagnetization.

ST's new programmable switches feature extensive built-in protection and diagnostics, which enhance safety and reliability by handling undervoltage, overvoltage, overload, short circuit, ground or supply rail disconnection. Individual fault signalling indicates overload and junction-overtemperature events. An additional sensor is provided for case overtemperature protection. The switches meet IEC 61000-4-2 ESD, IEC 61000-4-4, and IEC 61000-4-5 specifications for ESD, fast-transient, and surge immunity.

Demonstration boards and software are available for quick evaluation. The boards include X-NUCLEO-OUT05A1 and X-NUCLEO-OUT06A1 digital output expansion boards for use with the STM32 Nucleo development boards plus the software drivers associated with the X-CUBE-OUT5 software package that extends the functionality provided by STM32. Source code for a graphical user interface (STSW-IFAPGUI) is also available, which helps users realiise an entire industrial-automation environment on the desktop.

The IPS1025H and IPS1025H-32 are in production now and available in PowerSSO-24 from $3.51 for orders of 1000 pieces.

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