Foros Electrónica
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La Física es como el sexo: seguro que da alguna compensación práctica, pero no es por eso por lo que la hacemos.

Richard Feynman(1918-1988)
Físico estadounidense, premio Nobel de Física en 1965
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DALLAS - Texas Instruments Incorporated (TI) announced today a high efficiency, 500-kHz, step-down DC/DC integrated circuit (IC) with integrated FET that delivers 3-A of continuous output current and supports input voltages of 5.5 V to 36 V. The small, simple-to-design switcher speeds time to market for point-of-load systems, such as industrial applications, digital television, DVD, battery charging and 12 V/24 V distributed power systems.

TI's non-synchronous TPS5430 SWIFTTM converter provides greater than 90 percent power efficiency and two percent output voltage accuracy (down to 1.23 V). Delivering 3-A of continuous current (4-A peak) at full temperature and operating over a junction temperature range from -40°C to +125°C, the device excels in hot environments where good thermal performance is needed, such as an LCD digital TV display that operates without the use of a cooling fan. The TPS5430 is ideal for powering low-voltage digital signal processors (DSPs), FPGAs and general purpose processors. Additionally, for applications that require higher output voltage levels, such as high power LED or automotive systems, the TPS5430 can step-down voltages as high as 30 V.

To reduce the size of external components, the device's switching frequency is preset to 500 kHz. In addition, all compensation components are integrated into the TPS5430 monolithic device, which minimizes the total number of required external parts to seven components in a typical application.

Key Features of TPS5430:

  • Integrated 110 mohms N-channel MOSFET 
  • 90 Percent and Higher Efficiency at 3-A Continuous Output Current (4-A Peak) 
  • Input Voltage Range of 5.5 V to 36 V with Feed-Forward Feature to Provide Tight Regulation over Wide Input Variations 
  • Fixed 500 kHz Switching Frequency 
  • Output Voltage Adjustable Down 1.23 V with Two Percent Accuracy 
  • Internal 8 ms Soft Start Time 
  • 18 µA Shutdown Quiescent Current 
  • -40°C to +125°C Operating Junction Temperature 

Low-Voltage, High Frequency 3-A SWIFT DC/DC in QFN

In addition to the TPS5430, TI also announced the TPS54317 synchronous, step-down DC/DC converter with a high switching frequency, which can be synchronized up to 1.6 MHz. The highly efficient new switcher also supports 3-A of continuous current (4-A peak), while supporting an input voltage of 3 V to 6 V. The TPS54317, which comes in a 4 mm x 5 mm QFN package, reduces the size of external capacitors and inductors, while stepping down voltage as low as 0.9 V.

Designers who use the TPS5430 and TPS54317 can take advantage of interactive software and other design resources. The SWIFT Software Tool, available free through, includes a bill of materials, reference schematic, loop response graphs and an efficiency curve based on the designer's inputs. Additionally, more than a dozen application notes and evaluation modules on TI's TPS54xxx family of SWIFT ICs guide designers through such topics as sequencing, adjusting the output compensation and designing with high-frequency applications.

Domingo, 22 Enero, 2006 - 02:18
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