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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  Date: Sept 28-06 Rev E SPX294 A Low Dropout Linear Regulator © 2006 Sipex Corporation The SPX294 incorporates protec- tion against over-current faults, re- versed load insertion, over temper- ature operation, and positive and negative transient voltage. Thermal Considerations Although the SPX294 offers limit- ing 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 re- sistance path, the junction-to-case path. The tab of the device is elec- trically connected to GND. In order to insure the best thermal flow of the component, proper mounting is required. Consult heatsink manu- facturer for thermal resistance and design of heatsink. Power dissipation is calculated as fol- lows: PD = (VIN -VOUT)•(IOUT) Maximum Junction Temperature range: TJ = TA(max) + PD• θJA (thermal resis- tance, junction-to-ambient) Maximum junction temperature must not exceed 2°C. Capacitor Requirements The output capacitor is needed to insure stability and minimize the output noise. The value of the ca- pacitor varies with the load. How- ever, a minimum value of 10μF 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 0.1μF ce- ramic capacitor between input & ground is recommended. Minimum Load Current To ensure a proper behavior of the regulator under light load, a mini- mum load of mA for SPX294 is required. Typical Application Circuit Figure 19 shows a typical applica- tions circuit for an adjustable output regulator. The values of R and R2 set the output voltage value as fol- lows: VOUT = VREF • [ + (R/R2)]. A minimum value of 10kΩ is rec- ommended for R2 with a range be- tween 10kΩ to 47kΩ. APPLICATION INFORMATION SPX2941 VOUT V IN GND ADJ 4 2 3 5 1 R1 R2 10µF 6.8µF + + EN Figure 19. Adjustable Output Linear Regulator |
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