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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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TPS2480PW датащи(PDF) 21 Page - Texas Instruments |
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TPS2480PW датащи(HTML) 21 Page - Texas Instruments |
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21 / 60 page  SENSE S LIMIT V 50mV R 1.042m 1.2 I 1.2 40A = = = ´ ´ LIMIT(MAX) S 55 I 55 R 1m SENSE( MAX ) V mV A = = = 2 2 LIMIT(MAX) I 55 1 3 025 S S R Power R A m . W = ´ = ´ W = J(MAX) A(MAX) JA LIMIT(NOM) T 125 T 50 R 10 I 50 = = = = C C, C, , A W q J(MAX) A(MAX) DSON(MAX) 2 2 JA LIMIT(NOM) T T 125C 50C R 3m R I 10 (50A) - - = = = ´ ´ C W q TPS2480 TPS2481 www.ti.com SLUS939B – APRIL 2010 – REVISED DECEMBER 2010 1. Choose RS The following equation includes a factor of 1.2 (20%) for VSENSE and RS tolerance along with some additional margin. (5) • Choose RS = 1 mΩ (6) (7) Multiple sense resistors in parallel should be considered. 2. Choose M1 Select the M1 VDS rating allowing for maximum input voltage and transients. Then select an operating RDSON, package, and cooling to control the operating temperature. Most manufacturers list RDSON(MAX) at 25°C and provide a derating curve from which values at other temperatures can be derived. The next equation can be used to estimate desired RDSON(MAX) at the maximum operating junction temperature of TJ(MAX). (usually 125°C). TA(MAX) is the maximum expected ambient temperature. (8) (9) The junction-to-ambient thermal resistance RqJA, depends upon the package style chosen and the details of heat-sinking and cooling including the PCB. Actual “in-system” temperature measurements will be required to validate heat-sinking and cooling performance. Copyright © 2010, Texas Instruments Incorporated Submit Documentation Feedback 21 Product Folder Link(s): TPS2480 TPS2481 |
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