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Zakładka z wyszukiwarką danych komponentów |
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Zakładka z wyszukiwarką danych komponentów |
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AHF2805S/ES Arkusz danych(PDF) 16 Page - International Rectifier |
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AHF2805S/ES Arkusz danych(HTML) 16 Page - International Rectifier |
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16 / 19 page  16 www.irf.com AHF28XX Series Application Information Connecting the enable input (Pin 1) to input common (Pin 7) will cause the converter to shut down. It is recommended that the enable pin be driven by an open collector device capable of sinking at least 400µA of current. The open circuit voltage of the enable input is 15 ± 1.0VDC. If the inhibit function is not used, this input can be left unconnected because it is internally pulled-up. Thermal Management Assuming that there is no forced air flow, the package temperature rise above ambient ( ∆T) may be calculated using the following expression: where A = the effective surface area in square inches (including heat sink if used), P = power dissipation in watts. The total surface area of the AHF package is 4.9 square inches. If a worse case full load efficiency of 78% is assumed, then the case temperature rise can be calculated as follows: Hence, if T AMBIENT = +25°C, the DC/DC converter case temperature will be approximately 100 °C if no heat sink or air flow is provided. Inhibit Function (Enable) ∆T ≈ 80 A –0.7p 0.85 (°C) W Eff P P OUT 4 . 3 1 78 . 0 1 12 1 1 = ⎥⎦ ⎤ ⎢⎣ ⎡ − = ⎥ ⎦ ⎤ ⎢ ⎣ ⎡ − = ∆T = 80 (4.9)-0.7 (3.4)0.85 = 74°C To calculate the heat sink area required to maintain a specific case temperature rise, the above equation may be manipulated as follows: PKG Α − ⎥⎦ ⎤ ⎢⎣ ⎡ Ρ ∆Τ − 43 . 1 85 . 0 80 A HEAT SINK = As an example, if a maximum case temperature rise of 50°C rise above ambient is desired, then the required effective heat sink area is: 2 43 . 1 85 . 0 . 75 . 3 9 . 4 ) 4 . 3 ( 80 50 in HEATSINK = − ⎥⎦ ⎤ ⎢⎣ ⎡ = Α − Standard Microcircuit Drawing Equivalence Table Standard Microcircuit Vendor Cage IR Standard Drawing Number Code Part Number 5962-91600 52467 AHF2805S 5962-94568 52467 AHF2812S 5962-94563 52467 AHF2815S 5962-05205 52467 AHF2805D 5962-92111 52467 AHF2812D 5962-92351 52467 AHF2815D |
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