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LM3524DM データシート(PDF) 15 Page - Texas Instruments |
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LM3524DM データシート(HTML) 15 Page - Texas Instruments |
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15 / 29 page  LM2524D, LM3524D www.ti.com SNVS766E – JUNE 2009 – REVISED MAY 2013 Figure 23. Relation of Switch Timing to Inductor Current in Step-Down Regulator (4) Neglecting VSAT, VD, and settling ΔIL + = ΔI L −; (5) where T = Total Period The above shows the relation between VIN, Vo and duty cycle. (6) as Q1 only conducts during tON. (7) The efficiency, η, of the circuit is: (8) ηMAX will be further decreased due to switching losses in Q1. For this reason Q1 should be selected to have the maximum possible fT, which implies very fast rise and fall times. Calculating Inductor L1 (9) Since ΔIL+ = ΔIL − = 0.4I o Solving the above for L1 Copyright © 2009–2013, Texas Instruments Incorporated Submit Documentation Feedback 15 Product Folder Links: LM2524D LM3524D |
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