MAX1916 Output Parallel Connection Circuit

Published:2011/5/17 5:59:00 Author:Joyce | Keyword: MAX1916, Output, Parallel Connection | From:SeekIC

The drain source resistance of MAX1916 is set not to exceed 50Ω in the whole temperature range. A GaAsP - LED with a working current of 2mA guarantees the minimum voltage needed in proper function is UF + 1 00mV. Input voltage of 2.7 V can keep the working voltage of GaAsP - LED to2.7 V. In order to acquire lower differential pressure and higher output current, one can connect three ways of the output of MAX1916 in parallel to constitute a current source with 600A/A mirror coefficient . MAX1916 output parallel connection circuit is shown in the graph, and the drain source resistance is50/3 = 16.61 Ω (Max) if connected in this way. This kind of connectionallows the current of a single white light LED to reach 20mA above with 3V power supply,so as to meet current requirements in blacklight of products like portable mobile phones.Thevoltage source used to set the end-point current can be supplied by a main power with a strong load capacity alone,such as on mobile phones. USET can be supplied with a low noise + 2.8 V power source of RF circuit. If it is supplied directly by single lithium ion battery, MAX1916 can be applied to driveGaAsP - LED with relatively low forward voltage , and resort to other drive schemes for white light InGaN - LED with high forward voltage. Because when it is supplied by the lithium ion battery, as the discharge goes on,the input voltage may fail to reach the required bias voltage of the white light LED.



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