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AS3715 数据表(PDF) 37 Page - ams-OSRAM AG |
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AS3715 数据表(HTML) 37 Page - ams-OSRAM AG |
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37 / 159 page  Page 36 ams Datasheet Document Feedback [v1-03] 2015-Aug-10 AS3715 − Detailed Description – Power Management Functions Parameter Figure 37: DC/DC SU Parameter DC/DC SU Parameter: Shows the key electrical parameter of the DCDC boost converter. Symbol Parameter Conditions Min Typ Max Unit IVDD Quiescent Current Pulse skipping mode 140 μA VFB Feedback voltage for external resistor divider For constant voltage control 1.20 1.25 1.30 V VCURR Feedback voltage for current sink regulation CURR1, CURR2, CURR3 0.6 V IDCDC_FB Additional tuning current at FB_SU Adjustable by software in 1μA steps 031 μA Accuracy of feedback current @ full scale -7 7 % Vrsense_ max Current limit voltage at Rsense E.g.: 0.65A for 0.15Ω sense resistor 100 mV RSW Switch resistance ON-resistance of external switching transistor 1Ω Iload Load current At 25V output voltage 0 50 mA fIN Switching frequency Internal CLK frequency/4, default 1MHz fclk_int/4 MHz tMIN_ON Minimum ON time 130 ns MDC Maximum duty cycle @ 1MHz 91 % |
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