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SPX29501U5-L-2-5 Datasheet(PDF) 5 Page - Exar Corporation |
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SPX29501U5-L-2-5 Datasheet(HTML) 5 Page - Exar Corporation |
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5 / 9 page  5 Rev:B Nov 2008 SPX29500/01/02/03 5A Low Dropout Voltage Regulator © Copyright 2008 Exar Corporation APPLICATION INFORMATION The SPX29501/02 incorporates protection against over-current faults, reversed load insertion, over temperature operation, and positive and negative transient voltage. Thermal Considerations Although the SPX29501/02 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. TO-220 Design Example: Assume that V IN = 8V, VOUT = 5V, IOUT = 5A, TA = 50 °C, θ HA= 1°C/W, θCH= 2°C/W, and θ JC= 2 °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 = 15W. And the junction temperature is calculated as T J = TA + PD * (θHA + θCH + θ JC) or T J = 50 + 15 * (1+2+2) = 125°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 22 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 ce- ramic capacitor between input & ground is rec- ommended. Minimum Load Current To ensure a proper behavior of the regulator under light load, a minimum load of 10mA for SPX29501/02 is required. Adjustable Regulator Design The SPX29502 is an adjustable regulator that can be programmed to any value between 1.24V and 16V using 2 resistors, R1 and R2. The relationship between the resistors is: R1 = R2(V OUT/1.24-1). Error Flag The SPX29501 features an error flag that indicates either an over current or under voltage condition. The flag output goes low, sinking 10mA when either condition occurs. Enable Input The SPX29501/02 have an Enable function that switches the regulator on and off. Their thresh- olds are TTL compatible. Enabling the regulator requires approximately 20 µA of current. Typical Application Circuits Figure 1 represents at typical fixed output regu- lator. Figure 2 represents an adjustable output 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 guarantee a minimum regulator load current of 10mA. |
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