Product category: Power Supply ICs and Controllers
News Release from: National Semiconductor | Subject: LM5068
Edited by the Electronicstalk Editorial Team on 01 December 2003
Hot swap controller takes more onboard
A new -48V hot swap controller aims to deliver board area savings and long-term system reliability for communication systems.
A new -48V hot swap controller aims to deliver board area savings and long-term system reliability for communication systems Sampling now, this device integrates a 100V bias regulator with an active current control loop, start and fault timers and undervoltage/overvoltage (UV/OV) protection to provide a system solution for board insertion into live -48V backplanes
This article was originally published on Electronicstalk on 5 Jan 2001 at 8.00am (UK)
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"As National Semiconductor's first entry into the hot swap controller market, the LM5068 is the best in its class in terms of functionality and footprint", said Paul Greenland, Marketing Director of National Semiconductor's Power Management Group.
"National's LM5068 offers unique advantages to the customer that none of the existing products on the marketplace can match.
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The LM5068 is a highly integrated hot-swap controller with an internal high-voltage bias regulator and multiple user-programmable features designed to power and protect National's new family of high-voltage DC/DC regulators and controllers including the LM5000, LM5030 and LM5041".
National Semiconductor's LM5068 provides intelligent control of power supply during insertion and removal of modules into a live -48V backplane.
It can also be attached directly to a -48V bus.
The programmable UV and OV comparators set the operating input voltage range with input transient capability to 100V.
The robust operating range provides reliable power distribution and hot swap control in communications and networking equipment, high availability servers, -48V distributed power systems and central office switches.
The LM5068 provides trimmed and guaranteed 2% UV and OV thresholds plus a unique programmable UV/OV threshold hysteresis.
The threshold voltages are programmed by the ratio of an external resistor divider connected between the 48V supply rails and the LM5068 comparator inputs.
UV/OV hysteresis is generated by trimmed 20uA current sources that are switched into the external UV/OV resistor divider when a start/stop threshold is achieved.
Thus, the impedance of the external resistors determines the magnitude of UV and OV hysteresis.
The accurate and programmable UV/OV thresholds allow the designer to activate downstream DC/DC convertors within a narrow voltage window while preventing oscillations during on/off transitions.
Sampling today, the LM5068 housed in a MSOP-8 package is priced at $1.35 each in 1000-piece quantities.
Volume production is expected in late January 2004.
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