Product category:
Power Supply ICs and Controllers
News Release from: Texas Instruments (April 2001-March 2006) | Subject: TPS2345
Edited by the Electronicstalk Editorial
Team on 03 May 2002
High availability from hot swap
controller
A highly integrated hot-swap power controller from Texas Instruments is the first in the market to comply with the PICMG2.1 high availability model.
A highly integrated hot-swap power controller from Texas Instruments is the first in the market to comply with the high availability model of the CompactPCI Hot Swap Specification, PICMG2.1 The TPS2345, the latest in TI's broad family of hot-swap power management devices, enables fast and flexible PCI development, reducing design time and time to market by 50%
This article was originally published on Electronicstalk on 8 Nov 2004 at 8.00am (UK)
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Using a minimum of external components, the TPS2345 enables designers to easily modify the PCI power to the application.
Inrush current profile can be tailored to meet the application needs through closed loop control of the current ramp rate and maximum current value during plug-in start-up sequencing.
The role of the TPS2345 hot-swap power controller is to gracefully power-up inserted PCI boards, detect load failures in PCI plug-in boards, remove power from failed boards, protect the surrounding system from damage by isolating the failed board and communicate power events to the processor electronically, all without having to shut down the system.
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In meeting the requirements of the CompactPCI specification, the TPS2345 is an integral part of the next-generation architectures that are emerging for high-availability PCI platforms.
Key among those benefits is the IC's high level of integration, performing most of the PCI hot-swap power management functions.
The TPS2345 will sequentially ramp-up and ramp-off the PCI supplies.
As each PCI supply is ramped in sequence, its power is validated to ensure it is within the established tolerances.
A timer, also derived from the current ramp capacitor, sets a time limit for ramping each channel, protecting systems from start-up into faulted loads.
If all four supplies reach a known good state, the "healthy" output is pulled low to allow enumeration of the add-in board.
In addition, the TPS2345 has a low 20mV sense voltage limit, which allows the use of low value sense resistors, minimising insertion loss.
The insertion loss is further reduced with the high gate drive generated by the TPS2345 for external N-channel power FETs, making the TPS2345 the industry's lowest insertion loss hot-swap product.
To protect the backplane power bus, the TPS2345 provides an electronic circuit breaker that immediately latches on an overcurrent event.
The detection threshold of an overcurrent event is internally set to twice the maximum current.
If any channel trips the circuit breaker, all supply outputs will be rapidly turned off and will remain latched off.
Also, the "healthy" output will be pulled high.
The TPS2345 can be reset by cycling either the BD_SEL input or power to the device.
The TPS2345 hot-swap power controller comes in a 24-pin TSSOP package, and is available now from TI and its authorised distributors.
An evaluation module is also available from TI.
Suggested resale pricing for the TPS2345 is $4.50 in quantities of 1000.
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