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SPX29302AT5/TR Datasheet(PDF) 4 Page - Sipex Corporation |
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SPX29302AT5/TR Datasheet(HTML) 4 Page - Sipex Corporation |
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4 / 7 page  Date: 5/25/04 SPX29302A 3Amp LDO Low Dropout Voltage Regulator © Copyright 2004 Sipex Corporation 4 The SPX29302A incorporates protection against over-current faults, reversed load insertion, over temperature operation, and positive and negative transient voltage. Thermal Considerations Although the SPX29302A offers limiting circuitry for overload conditions, it is still necessary to insure that the maximum junction temperature is not exceeded in the applica- tion. 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. TO-220 Design Example: Assume that V IN = 10V, VOUT = 5V, IOUT = 1.5A, T A = 50°C, θHA= 1°C/W, θCH= 2°C/W, and θ JC= 3C°/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 = 7.5W. And the junction temperature is calculated as T J = TA + PD * (θHA + θCH + θ JC) or T J = 50 + 7.5 * (1+2+3) = 95°C Reliable operation is insured below 125 °C. 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 SPX29302A is required. Adjustable Regulator Design The SPX29302A are adjustable regulators that can be programmed to any value between 1.25V and 16V using 2 resistors, R1 and R2. The relationship between the resistors is: R1 = R2(VOUT/1.240-1). Enable Input The SPX29302A has an Enable function that switches the regulator on and off. Its thresholds is TTL compatible. When the regulator is active, approximately 20 uA flows through the Enable pin. Typical Application Circuits Figure 1 represents an adjustable output linear regulator. The values of R1 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 10kohms is recommended for R2 with a range between 10kohms and 47 kohms. APPLICATION INFORMATION |
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