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Two-channel power switch simplifies design

Posted: 07 May 2010     Print Version  Bookmark and Share

Keywords:power switch  energy loss  industrial control 

VNI2140J power switch

STMicroelectronics debuts two-channel intelligent power switch that simplifies design, enhances reliability, and saves PCB space in equipment such as programmable logic controllers, peripheral I/O, industrial process controls, robotic systems, vending machines, alarm and security systems and textile machines.

The VNI2140J intelligent power switch designed for use in industrial controls which provides improved accuracy to minimise energy losses and prevent system errors when faults occur. These advantages are achieved using ST's latest generation VIPower technology, which allows a lower overload current limit than competing devices to maintain stable power conditions while the system is recovering.

This new two-channel IC is an important addition to ST's VIPower portfolio, which already includes single-, quad- and octal-channel devices. The VNI2140J has a space-saving 6mm x 5mm footprint and integrates all the necessary logic, driver circuitry, power stage, protection, and diagnostic functions. The chip's inputs are 3.3V TTL/CMOS compatible; its outputs are connected in the high-side configuration; and two independent resistive, inductive or capacitive loads can be driven.

The chip's built-in shorted-load protection with independent active current limitation for each channel prevents load faults from pulling down the system power supply. If either channel becomes overloaded that channel is turned off independently while the other continues operating normally, and it is restarted automatically when the junction temperature has returned to normal. If both channels are overloaded, they are restarted non-simultaneously to avoid drawing high peak currents from the power supply. Other features helping designers to deliver rugged, highly featured solutions include protection against loss of ground, as well as diagnostics such as open-load detection in the OFF state.

The VNI2140J features 9V to 36V supply voltage and 0.08Ω RDS(ON) for high efficiency in normal operation. The device packs nominal current of 0.5A per channel and output current limit greater than 1A per channel. The power switch also includes fast demagnetisation of inductive loads and conforms to IEC 61131-2 for programmable controllers.

The VNI2140J is in mass production in the PowerSSO-12 package, priced at Rs.69.27 ($1.50) for quantities of 100 pieces. Further pricing options are available for larger quantities.

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