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SPX3940AU-2.5 Datasheet(PDF) 6 Page - Sipex Corporation |
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SPX3940AU-2.5 Datasheet(HTML) 6 Page - Sipex Corporation |
6 / 11 page 6 Date: 5/25/04 SPX3940 1A Low Dropout Voltage Regulator © Copyright 2004 Sipex Corporation APPLICATION INFORMATION The SPX3940 incorporates protection against over-current faults, reversed load insertion, over temperature operation, and positive and nega- tive transient voltage. Thermal Considerations Although the SPX3940 offers limiting circuitry for overload conditions, it is still necessary to insure that the maximum junction temperature is not exceeded in the application. Heat will flow through the lowest resistance path, the junction-to-case path. In order to insure the best thermal flow of the component, proper mount- ing is required. Consult heatsink manufacturer for thermal resistance and design of heatsink. For example, TO-220 design: Assume that V IN = 10V, VOUT = 5V, IOUT = 1.5A, T A = 50°C/W, θHA= 1°C/W, θCH = 2°C/W, and θ JC = 3°C/W. Where TA = ambient temperature θ HA = heatsink to ambient thermal resistance θ CH = case to heatsink thermal resistance θ JC = junction to case thermal resistance The power calculated under these conditions is: P D = (VIN - VOUT) * IOUT = 7.5W. And the junction temperature is calculated as T J = TA + PD * (θHA + θCH + θJC) or T J = 50 + 7.5 * (1 + 2 + 3) = 95°C Reliable operation is insured. Capacitor Requirements The output capacitor is needed to insure stability and minimize the output noise. The value of the capacitor varies with the load. However, a minimum value of 10 µF aluminum capacitor will guarantee stability over all load conditions. A tantalum capacitor is recommended if a faster load transient response is needed. If the power source has a high AC impedance, a 0.1 µF ceramic capacitor between input & ground is recommended. Minimum Load Current To ensure a proper behavior of the regulator under light load, a minimum load of 5mA for SPX3940 is required. SPX3940 V OUT V IN + 6.8µF + 10µF 1 2 3 Figure 18. Fixed Output Linear Regulator. |
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