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Overvoltage controller shields beyond 100V

Posted: 19 Jan 2012 ?? ?Print Version ?Bookmark and Share

Keywords:surge stopper? overvoltage controller? sense resistor?

Linear Technology Corp. has unleashed an overvoltage protection controller that claims to offer overvoltage and overcurrent protection to high-availability electronic systems. According to the company, the LT4363 creates a robust, adaptable and space-efficient design with simple control of an N-channel MOSFET.

The LT4363 controller extends overvoltage protection without sacrificing overcurrent protection, noted the company. It reacts quickly to overcurrent and short-circuit faults at the load, limiting the current to a safe value set by a sense resistor. Likewise, only the controller and the MOSFET suffer the high voltage surge, safeguarding downstream components, said Linear Tech.

LT4363

The LT4363 touts operational capability down to 4V.

Armed with a 100V maximum rating and operational capability down to 4V (cold-crank), the LT4363 makes for an ideal barrier against badly behaving supplies, stated Linear Tech. A simple clamp on the controller supply extends protection beyond the native 100V. It even survives reversed battery connections to -60V. During voltage surges, the output is regulated to a voltage set by a resistive divider, allowing the load to operate safely and smoothly through transient events.

Surge stopper touts unlimited overvoltage protection
Linear Tech has also released an overvoltage controller for electronic systemsLTC4366that operates from 9V to greater than 500V and uses an adjustable floating topology to enable very high voltage operation independent of the voltage rating of the surge protector's internal circuitry.

Overvoltage and undervoltage comparator inputs ensure that the LT4363 remains off outside a user-defined voltage range. To limit the thermal stress on the power MOSFET, the LT4363 uses a VDS-accelerated fault timer. If the fault persists, a warning is issued before the MOSFET is shut off. By limiting the MOSFET gate slew-rate with a resistive-capacitive (RC) network, the controller can be adapted for inrush control in Hot Swap applications. In the shutdown state, the LT4363 sips just 7?A of supply current, preserving battery life. A built-in thermal shutdown occurs at about 150C.

The LT4363 is available in two options: the LT4363-1 latches off after a fault, whereas the LT4363-2 will retry after a long cool-down period. Specified over the full commercial and industrial temperature ranges, the LT4363 is offered in 12-pin DFN (4 x 3mm) and MSOP packages, and a 16-pin SO package with enhanced high-voltage pin spacing. Pricing begins at $2.48 each for 1,000-piece quantities and the device is now available in production quantities.





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