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Use current monitors for accurate measurement

Posted: 02 Jul 2007 ?? ?Print Version ?Bookmark and Share

Keywords:current monitors for accurate current measurement? current measurement application? regulation of the LED current?

Many modern electronic systems now require some form of current measurement to improve power dissipation, efficiency and reliability. These systems range from LED driving to portable equipment and power supplies of all sizes. To maximize high-power LEDs' lifetime, accurate regulation of the LED current is required. Most regulators, however, are voltage regulators using 2.5V or 1.25V references to maintain high-performance regulation. Unfortunately, when programmable voltage regulators are used as current regulators, the voltage drop across the current-sensing resistors gives too large a power loss, as the voltage drop across the resistor is equal to the reference voltage.

Simon Ramsdale, product marketing manager at Zetex Semiconductors plc, discusses more about current monitors for accurate measurement in this technical article.

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