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NSC hot-swap controller saves board area

Posted: 02 Dec 2003 ?? ?Print Version ?Bookmark and Share

Keywords:national semiconductor? hot swap controller? lm5068?

National Semiconductor Corp. has unveiled a -48V hot swap controller that delivers board area savings and long-term system reliability for communication systems. The device integrates a 100V bias regulator with an active current control loop, start and fault timers and under-voltage/ over-voltage (UV/OV) protection to provide a system solution for board insertion into live -48V backplanes.

The LM5068 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 percent UV and OV thresholds plus a 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 20mA current sources that are switched into the external UV/OV resistor divider when a start/stop threshold is achieved.

The LM5068 is housed in a MSOP-8 package is priced at $1.35 each in 1,000 piece quantities. It is available with latched off fault mode and continuous re-try versions.

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