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SPX29150U-2.5 Datasheet(PDF) 7 Page - Sipex Corporation |
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SPX29150U-2.5 Datasheet(HTML) 7 Page - Sipex Corporation |
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7 / 9 page  7 Date:5/25/04 SP29150/51/52/53 1.5A Low Dropout Voltage Regulator © Copyright 2004 Sipex Corporation The SPX29150/51/52/53 incorporates protec- tion against over-current faults, reversed load insertion, over temperature operation, and positive and negative transient voltage. Thermal Considerations Although the SPX29150/51/52/53 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 mounting is required. Consult the heatsink manufacturer for thermal resistance and heat sink design. TO-220 Design Example: Assume that VIN = 10V, VOUT = 5V, IOUT = 1.5A, TA = 50°C, θHA= 1°C/W, θCH= 2°C/W, and θJC= 3C°/W, where: TA = ambient temperature, θHA= heatsink to ambient thermal resistance θCH= case to heatsink thermal resistance θJC = junction to case thermal resistance The power calculated under these conditions is: PD = (VIN – VOUT) * IOUT = 7.5W. SPX29150 VOUT V IN 6.8 F + + 10 F 1 2 3 SPX29152 VOUT VIN GND ADJ 1 2 3 4 5 R1 R2 6.8 F ++ 10 F Figure 19. Fixed Output Linear Regulator Figure 20. Adjustable Output Linear Regulator And the junction temperature is calculated as TJ = TA + PD * (θHA + θCH + θJC) or TJ = 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 alumi- num 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 capaci- tor 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 SPX29150/51/52/53 is required. Typical Application Circuits Figure 19 represents at typical fixed output regulator. Figure 20 represents an adjustable output regulator. The values of R1 and R2 set the output voltage value as follows: VOUT =VREF * [1 + (R1/R2)]. For best results, the total series resistance should be small enough to pass a minimum regulator load current of 5mA. A minimum value of 10k Ω is recom- mended for R2 with a range between 10k Ω and 47k Ω. APPLICATION INFORMATION |
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