Intelligent hot swap does for diodes

Texas Instruments today announced the release of an intelligent hot swap controller that eliminates the need for OR-ing diodes in redundant -48 V systems.

Providing designers with new advancements in high performance hot swap technology, Texas Instruments (TI) today announced an intelligent hot swap controller that eliminates the need for OR-ing diodes in redundant -48 V systems.

The device, which according to TI is ideally suited for distributed power systems such as wireless base stations and central office switching, offers greater levels of power efficiency and performance and effectively minimises system power dissipation and voltage drop.

Allowing precise control of current and voltage during turn-on and operation, TI’s TPS2350 hot swap power manager operates with supply voltages ranging from -12 V to -80 V, and can withstand spikes to -100 V.

Minimising power dissipation and voltage loss, the TPS2350 device uses two power field effect transistors (FETs) as low voltage drop diodes to select between two redundant power supplies. The controller, which uses less than 10 external components, incorporates a third FET to provide hot swap load current slew rate control and peak magnitude limiting that is programmed by one resistor and one capacitor.

According to TI, traditional diode OR-ing methods for connecting redundant power supplies often result in power losses and uncontrolled inrush over-current. While some limitations can be addressed with a simple hot-swap controller, the TPS2350 provides the industry’s best power-efficient remedy for these issues. Allowing a significantly less amount of power loss, TI’s controller integrates programmable features such as undervoltage and overvoltage limits, circuit breaking and a fault timer, all on one device.

The low loss of power achieved through the TPS2350 enhances applications designed to support PCI Industrial Computer Manufacturers Group’s (PICMG) Advanced Telecom Computing Architecture (AdvancedTCA(TM)) specification.

The device also allows application developers to meet the one percent undervoltage lockout (UVLO) specifications of the AT&T Network Equipment Development Standards (NEDS v4.0) and the American National Standard (ANSI 315) for Telecommunications.

The TPS2350 also provides a power good output to enable down-stream power converters and a fault output to indicate load programs.

Key features include transient Rating to -100 V, a programmable current limit, programmable UV/OV thresholds and hysteresis and -40 degrees C to 85 degrees C Ambient Operating Range.

TPS2350 is shipping in volume today in a 14-pin thin shrink small outline package (TSSOP), and is priced at $1.90 per 1,000 units. Evaluation modules of the TPS2350 can be obtained in less than 24 hours through <A HREF=’’>TI Power</A>

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