Product category: Power Supply ICs and Controllers
News Release from: National Semiconductor | Subject: LM5005
Edited by the Electronicstalk Editorial Team on 19 September 2005
Buck regulator handles more current
A new high-frequency buck regulator steps down an input voltage from 7 to 75V to produce a regulated 2.5A power supply, adjustable from 1.225 to 65V.
National Semiconductor has expanded its family of high-voltage buck regulators with the introduction of the LM5005 This high-frequency buck regulator steps down an input voltage from 7 to 75V to produce a regulated 2.5A power supply, adjustable from 1.225 to 65V
This article was originally published on Electronicstalk on 5 Jan 2001 at 8.00am (UK)
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Reliable and compact, the LM5005 is optimised for 48V telecom, automotive and industrial power supply applications.
"The LM5005 addresses our customers' requests for a higher-current version of the popular 75V, 1.0A LM5010 and 75V, 0.5A LM5007 buck regulators", said Werner Berns, Product Marketing and Applications Manager Power Management for National Semiconductor in Europe.
"The entire family is highly integrated for a smaller overall footprint, with unique, high-frequency switching that allows our customers to implement step-down switching regulators with minimal filtering and external components".
The LM5005 high-voltage switching regulator integrates a 75V N-channel MOSFET and employs a proprietary scheme that uses emulated, current-mode pulsewidth modulation (PWM) to produce a 2.5A step-down regulator with minimal external components.
This proprietary control method generates an internal emulated inductor current ramp that significantly reduces the noise sensitivity of the controller.
This allows the LM5005 to reliably control very small duty cycles so designers can take full advantage of the LM5005's wide 75V input and 500kHz frequency capabilities.
In addition, current-mode control provides inherent line voltage feed-forward and simplified loop compensation.
The programmable operating frequency can range from 50 to 500kHz.
A novel, bidirectional oscillator synchronisation pin allows multiple LM5005 regulators to self-synchronise or switch synchronously with an external clock.
Additional protection features include current limit, thermal shutdown and shutdown capability.
The device is available in the TSSOP-20 package, featuring an exposed mounting pad to enhance the package's thermal dissipation.
Available now, the LM5005 is priced at $3.25 in 1000-unit quantities.
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