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SPX29152 Datasheet(PDF) 7 Page - Exar Corporation |
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SPX29152 Datasheet(HTML) 7 Page - Exar Corporation |
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7 / 13 page  7 REV B 06/05/08 SP29150/51/52/53 1.5A Low Dropout Voltage Regulator © Copyright 2008 Exar Corporation The SPX29150/51/52/53 incorporates pro- tection against over-current faults, reversed load insertion, over temperature operation, and positive and negative transient volt- ages. 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 thecomponent,propermountingisrequired. Consult the heatsink manufacturer for ther- mal resistance and heat sink design. TO-220 Design Example: Assume that VIN = 10V, VOUT = 5V, IOUT = 1.5A, TA = 50°C, θH= 1°C/W, θCH= 2°C/W, and θJC= 3C°/W, where: TA = ambient temperature, θHA = heatsink to ambient thermal resis- tance θCH = case to heatsink thermal resistance θJC = junction to case thermal resistance The power calculated under these condi- tions is: PD = (VIN – VOUT) * IOUT = 7.5W. And the junction temperature is calculated as TJ = TA + PD * (θHA + θCH + θJC) or SPX29150 VOUT VIN 6.8µF + + 10µF Figure 19. Fixed Output Linear Regulator Figure 20. Adjustable Output Linear Regulator 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 10µF alumi- numcapacitorwillguaranteestabilityoverall load conditions. Atantalum capacitor is rec- ommendedifafasterloadtransientresponse is needed. If the power source has a high AC impedance, a 0.1µF ceramic capacitor between input & ground is recommended. The output capacitors maximum ESR value for stable operation is 0.33ohms. Minimum Load Current To ensure proper behavior of the regulator under light loads, a minimum load of 5mA for SPX29150/51/52/53 is required. Typical Application Circuits Figure 19 represents a typical fixed output regulator. Figure20representsanadjustable output regulator. The values of R1 and R2 set the output voltage value as follows: VOUT =VREF * [1 + (R1/R2)]. A minimum value of 10kΩ is recommended for R2 with a range between 10kΩ and 47kΩ. APPLICATION INFORMATION SPX29152 VOUT VIN GND ADJ 1 2 3 4 5 R1 R2 6.8 µ F + + 10 µ F |
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