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FLTR100V810Z Datasheet(PDF) 8 Page - Lineage Power Corporation |
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FLTR100V810Z Datasheet(HTML) 8 Page - Lineage Power Corporation |
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8 / 13 page  8 Lineage Power Data Sheet March 2008 75 Vdc Input Maximum, 10 A Maximum FLTR100V10 Filter Module Application (continued) Figures 9 and 10 show some experimental results obtained by using the filter module, together with the recommended external components shown in Figures 6 and 7. The JW075A5 module is a lower-noise version of the standard JW series with internal modifications to the power module. The lower noise of the JW075A5 module is achieved at the cost of lower efficiency, and a reduced maximum power rating. Measured noise is highly dependent on layout, grounding, cable orienta- tion, and load characteristics and will, therefore, vary from application to application. Thermal Considerations Filter modules operate in a variety of thermal environ- ments; however, sufficient cooling should be provided to help ensure reliable operation. Considerations include ambient temperature, airflow, module power dissipation, and the need for increased reliability. A reduction in the operating temperature of the module will result in an increase in reliability. The thermal data presented in the data sheet is based on physical measurements taken in a wind tunnel. The thermal reference point used for thermal derating curves presented in Figure 1 is the case of the module. For reliable operation this temperature should not exceed 100oC. Other Considerations It is essential for good EMI performance that the input lines not be contaminated with noise after passing through the filter. Filtered input traces should therefore be kept away from noise sources such as power mod- ules and switching logic lines. If input voltage sense traces must be routed past the power modules from the quiet side of the filter module, they should be filtered at the point where they leave the quiet input lines. Input traces should be kept as far away from output power traces as possible. The fundamental switching frequency noise spike can be somewhat reduced by adding a high-frequency capacitor of a few microfarads across the input lines of the filter module. Adding additional components to the input filter to improve performance usually has very limited payback, and may actually increase the noise conducted onto the input lines. Adding Y caps to the input side of the fil- ter module couples any noise in the ground plane directly into the input lines, usually degrading perfor- mance. Adding additional X and Y caps to the power module side of the filter module produces low- impedance loops for high-frequency currents to flow, possibly degrading performance. Adding additional common-mode or differential-mode filtering to the power module output leads decreases the power module output noise, and also frequently reduces the input noise by decreasing the noise cou- pled from output leads to input leads. Common-mode output filtering is particularly important if the load is tied to chassis ground. If common-mode filtering is added to the power module output, ensure that remote-sense leads sense the output voltage before the common- mode filter. Do not use remote-sense on the load side of an output common-mode filter. If input noise performance is unsatisfactory after apply- ing the filter module as described previously, the best remedy is to modify the layout and grounding scheme. It is often useful to make a model of the power card, using copper tape and a vector card, to experiment with various layout and grounding approaches prior to committing to a printed-wiring board. |
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