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IR3721 Datasheet(PDF) 5 Page - International Rectifier |
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IR3721 Datasheet(HTML) 5 Page - International Rectifier |
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5 / 16 page  IR3721 DATA SHEET Page 5 of 16 www.irf.com 09/15/08 FUNCTIONAL DESCRIPTION Please refer to the Functional Description Diagram below. Power flow from the buck converter inductor is the product of output voltage times the current IL flowing through the inductor. Power is measured with the aid of International Rectifier’s proprietary TruePower™ circuit. Current is converted to a duty ratio that appears at the DI pin. The duty ratio of the DI pin is Τ ⋅ ) + ( ⋅ = R T 2 CS 1 CS L RATIO DUTY V R R R DCR I DI Equation 1 The full-scale current that can be measured corresponds to a duty ratio of one. The amplitude of the DI pin is the voltage appearing at pin VK. If a fixed voltage is applied to VK then the output of the RC filter driven by DI will be proportional to inductor current IL. If VO is applied to VK as shown in the figure then the output of the DI driven RC network will be proportional to power. The full-scale voltage that can be measured is established on the chip to be 1.8V. The full scale power PFS that can be measured is the product of full-scale voltage and full scale current. RT RCS2 GND Vo CCS2 DI Power RCS1 CCS1 L DCR VRT VDD IR3721 VK VCS IL VO Vin Figure 1 Functional Description Diagram |
Similar Part No. - IR3721_09 |
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Similar Description - IR3721_09 |
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