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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SPX2941T5/TR датащи(PDF) 7 Page - Sipex Corporation |
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SPX2941T5/TR датащи(HTML) 7 Page - Sipex Corporation |
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7 / 10 page  7 Date: 08/25/04 SPX2941 1A Low Dropout Voltage Regulator © Copyright 2004 Sipex Corporation APPLICATION INFORMATION The SPX2941 incorporates protection against over-current faults, reversed load insertion, over temperature operation, and positive and negative transient voltage. Thermal Considerations Although the SPX2941 offers limiting circuitry for overload conditions, it is still necessary to insure that the maximum junction tempera- ture 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. Since the tab of the device is electrically connected to GND, the tab must be electrically isolated using a ther- mally conductive spacer, which itself contrib- utes some small additional thermal resistance. Consult heatsink manufacturer for thermal resistance and design of heatsink. TO-220 Design Example: Assume that V IN = 10V, VOUT = 5V, IOUT = 1A, T A = 50°C, θHA= 1°C/W, θCH = 2°C/W, and θ JC = 3°C/W, where T A = 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 = 5W, and the junction temperature is calculated as T J = TA + PD * (θHA + θCH + θ JC) or T J = 50 + 5.0 * (1 + 2 + 3) = 80°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 10µF alumi- num capacitor will guarantee stability over all load conditions. A tantalum capacitor is rec- ommended if a faster load transient response is needed. If the power source has a high AC impedance, a 0.1µF 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 SPX2941 is required. Typical Application Circuit Figure 18 shows a typical applications circuit for an adjustable output regulator. The values of R 1 and R2 set the output voltage value as follows: V OUT = VREF * [1 + (R1/R2)]. For best results, the total series resistance should be small enough to pass a minimum regulator load current of 5 mA. A minimum value of 10kΩ is recommended for R 2 with a range between 10kΩ to 47k Ω. Figure 19. Adjustable Output Linear Regulator SPX2941 V OUT V IN GND ADJ 4 2 3 5 1 R1 R2 10µF 6.8µF + + EN |
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