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Power/Alternative Energy  

ST's quad high-side solid state relay cuts RDS(on) by 50%

Posted: 29 Nov 2007     Print Version  Bookmark and Share

Keywords:intelligent power switch  quad high-side  solid-state relay 

A quad high-side solid-state relay that saves energy by cutting RDS(on) by 50 per cent has been launched by STMicroelectronics. The VNI4140K uses the latest generation of ST's VIPower technology to achieve the 50 percent saving compared to earlier devices with the same die size. It features smaller package, lower quiescent current and added protection.

The dramatic reduction in on-resistance and quiescent current saves energy through lower losses, with device power consumption lower than any competitive product, and achieved at lower cost. Power consumption is cut by 40 percent compared to earlier generation devices. Additionally, optimising the trade-off between Rds(on) and die size allows the VNI4140K to be produced in a compact PowerSSO24 package, saving space in the application compared to competitive four-channel devices.

IPS devices integrate a logic interface, drivers and protection circuits on the same chip as a power stage, to simplify system design and save space in high-power industrial applications such as programmable logic controllers, numerical control machines, robotics and building automation systems.

ST's intelligent power switches include a broad range of current and thermal protection features, with per-channel diagnostic bits and double thermal protection being new additions in the VNI4140K. In addition to over-temperature protection for safe operation when current draw is too high, the switch's case over-temperature protection independently limits the PCB temperature. Channels restart independently after a case thermal shut-down, to limit the peak current.

The VNI4140K provides short-circuit and over-current protection, under-voltage shut-down, fast demagnetization for safe operation with large inductive loads, and protection against loss of ground. Diagnostic outputs are open drain to enable wired-OR configuration with other devices, and the logic inputs are 3.3V CMOS/TTL compatible. The switch conforms fully to the IEC 61131-2 standard for programmable logic devices.

Engineering samples of the VNI4140K, in the PowerSSO24 package, are available now, with volume production planned for January 2008. It is priced at Rs.71.19 ($1.80) in quantities of 10,000 pieces.




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