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AN-1204 Datasheet(PDF) 4 Page - International Rectifier |
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AN-1204 Datasheet(HTML) 4 Page - International Rectifier |
4 / 11 page www.irf.com 4 AN-1204 For satellites and space borne payloads, criteria for choosing such a heat sink involve size and weight restrictions also. So highest acceptable temperature rise should be used for working backwards to design a heat sink. For example, let us assume we have 35 C in space environment and we accept a temperature rise of 25 C above this and thus design a heat sink to maintain case temperature of 60 C. Same methodology can be followed for any other allowable temperature rise or any other acceptable size and weight of heat sink. This is, because heat can be transferred only by conduction and radiation in space The Thermal Analysis of ARE28XXS-D goes into great details about power dissipation and likely temperature rise of each power semiconductor die used in the converter, stating margins between its rated dissipation and actual designed-in dissipation. As can be appreciated, this margin is sufficient for guaranteeing reliable performance during its lifetime. 4 REMOTE SENSE: The remote sense feature helps maintain output voltage regulation at the load by correcting for the voltage drop along the conductors that connect the load to the converter’s output. This feature is available only on single output model (ARE28XXS). To use this feature connect ±Sense pins directly to the load. One can use thinner gauge wires for this connection, but it is recommended that these wires be twisted. Alternatively one can use a shielded cable with the shield being connected to case of the converter, which can be grounded as shown in Figure (2) Figure (2) Remote sense feature-single model If user decides not to make use of the Remote sense feature, it is imperative that +Sense pin be connected to +Output and –Sense pin be connected to –Output. This is shown in Figure (3). |
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