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LM2735XMF/NOPB Datasheet(PDF) 42 Page - Texas Instruments |
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LM2735XMF/NOPB Datasheet(HTML) 42 Page - Texas Instruments |
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42 / 59 page  or K = + LOSS OUT P P OUT P K = IN P OUT P PDISS-TOP INTERNAL SMALL LARGE PCB DEVICE PDISS-PCB PDISS TJUNCTION TAMBIENT C6J-PCB C6J-CASE R6J-PCB R6J-CASE C6CASE-AMB TCASE EXTERNAL PDISS TPCB R6PCB-AMB C6PCB-AMB R6CASE-AMB LM2735, LM2735-Q1 SNVS485G – JUNE 2007 – REVISED AUGUST 2015 www.ti.com Thermal Considerations (continued) Figure 48. Associated Thermal Model 10.3.4 Calculating Efficiency, and Junction Temperature The complete LM2735 DC-DC converter efficiency ( η) can be calculated in the following manner. (30) Power loss (PLOSS) is the sum of two types of losses in the converter, switching and conduction. Conduction losses usually dominate at higher output loads, where as switching losses remain relatively fixed and dominate at lower output loads. Losses in the LM2735 device: PLOSS = PCOND + PSW + PQ (31) 42 Submit Documentation Feedback Copyright © 2007–2015, Texas Instruments Incorporated Product Folder Links: LM2735 LM2735-Q1 |
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