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AFL12015DZ-ES Datasheet(PDF) 7 Page - International Rectifier |
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AFL12015DZ-ES Datasheet(HTML) 7 Page - International Rectifier |
7 / 11 page www.irf.com 7 AFL50XXS Series A conservative aid to estimating the total heat sink surface area (AHEAT SINK) required to set the maximum case temp- erature rise ( ∆T) above ambient temperature is given by the following expression: A HEAT SINK ≈ − − ∆T P 80 30 085 143 . . . where ∆T PP Eff OUT = == − Case temperature rise above ambient Device dissipation in Watts 1 1 ∆T = 85 - 25 = 60°C and the required heat sink area is If the worst case full load efficiency for this device is 83%; then the power dissipation at full load is given by Because of the incorporation of many innovative techno- logical concepts, the AFL series of converters is capable of providing very high output power from a package of very small volume. These magnitudes of power density can only be obtained by combining high circuit efficiency with effec- tive methods of heat removal from the die junctions. This requirement has been effectively addressed inside the de- vice; but when operating at maximum loads, a significant amount of heat will be generated and this heat must be conducted away from the case. To maintain the case tem- perature at or below the specified maximum of 125°C, this heat must be transferred by conduction to an appropriate heat dissipater held in intimate contact with the converter base-plate. When operating in the shared mode, it is important that symmetry of connection be maintained as an assurance of optimum load sharing performance. Thus, converter out- puts should be connected to the load with equal lengths of wire of the same gauge and sense leads from each con- verter should be connected to a common physical point, preferably at the load along with the converter output and return leads. All converters in a paralleled set must have their share pins connected together. This arrangement is diagrammatically illustrated in Figure III. showing the out- puts and return pins connected at a star point which is located close as possible to the load. As a consequence of the topology utilized in the current sharing circuit, the share pin may be used for other func- tions. In applications requiring only a single converter, the voltage appearing on the share pin may be used as a “cur- rent monitor”. The share pin open circuit voltage is nomi- nally +1.00v at no load and increases linearly with increas- ing output current to +2.20v at full load. 1Sil-Pad is a registered Trade Mark of Bergquist, Minneapolis, MN Thermal Considerations Since the effectiveness of this heat transfer is dependent on the intimacy of the baseplate/heatsink interface, it is strongly recommended that a high thermal conductivity heat transferring medium is inserted between the baseplate and heatsink. The material most frequently utilized at the fac- tory during all testing and burn-in processes is sold under the trade name of Sil-Pad 4001 . This particular product is an insulator but electrically conductive versions are also available. Use of these materials assures maximum sur- face contact with the heat dissipater thereby compensating for any minor surface variations. While other available types of heat conductive materials and thermal compounds pro- vide similar effectiveness, these alternatives are often less convenient and can be somewhat messy to use. As an example, it is desired to maintain the case tempera- ture of an AFL5015S at ≤ +85°C while operating in an open area whose ambient temperature is held at a constant +25°C; then Thus, a total heat sink surface area (including fins, if any) of 71 in2 in this example, would limit case rise to 60°C above ambient. A flat aluminum plate, 0.25" thick and of approxi- mate dimension 4" by 9" (36 in2 per side) would suffice for this application in a still air environment. Note that to meet the criteria in this example, both sides of the plate require unrestricted exposure to the ambient air. () P =• − =• = 120 1 83 1 120 0 205 24 6 . .. W A = 60 80 24.6 in HEAT SINK 0.85 • −= −143 2 30 71 . . |
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