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Extending boost converter input-voltage ranges

Posted: 08 Oct 2014     Print Version  Bookmark and Share

Keywords:DC/DC controllers  under-voltage lockout  UVLO  supercapacitor  load transient 

Wide-input-range DC/DC controllers usually have built-in under-voltage lockout (UVLO) circuits to prevent the converters from misoperating when the input voltage is below the UVLO threshold. However, the UVLO circuit might also cause undesirable shutdown in the event of a load transient or a supercapacitor discharge in applications where input voltage is above the UVLO threshold at start-up but later may drop below this threshold. In addition, these controllers normally cannot be used in applications where the input voltage is always under the UVLO threshold. This application note presents several split-rail approaches to extend boost-converter input-voltage ranges, enabling the use of these controllers with input voltage lower than their UVLO thresholds. Design examples along with test results are provided to validate these approaches.

View the PDF document for more information.

Originally published by Texas Instruments Inc. at www.ti.com as "Split-rail approaches extend boost converter input-voltage ranges".





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