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SPX2810T Datasheet(PDF) 5 Page - Sipex Corporation |
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SPX2810T Datasheet(HTML) 5 Page - Sipex Corporation |
5 / 9 page 5 Date: 5/25/04 SPX2810 1A Low Dropout Linear Regulator © Copyright 2004 Sipex Corporation PC BOARD TOPSIDE COPPER BACKSIDE COPPER THERMAL RESISTANCE AREA mm2 AREA mm2 AREA mm2 JUNCTION TO AMBIENT °C/W 2500 2500 2500 46 2500 1250 2500 47 2500 950 2500 49 2500 2500 0 51 2500 1800 0 53 1600 600 1600 55 2500 1250 0 58 2500 915 0 59 1600 600 0 67 900 240 900 72 900 240 0 85 Figure 8. 600mA Current Source Figure 9. Typical Adjustable Regulator Ripple Rejection Ripple rejection can be improved by adding a capacitor between the ADJ pin and ground as shown in Figure 6. When ADJ pin bypassing is used, the value of the output capacitor required increases to its maximum. If the ADJ pin is not bypassed, the value of the output capacitor can be lowered to 10(F for an electrolytic aluminum capacitor or 2.2 µF for a solid tantalum capacitor (Fig 10). However the value of the ADJ-bypass capacitor should be chosen with respectto the following equation: C = 1 / ( 6.28 * F R * R1 ) Where C = value of the capacitor in Farads (select an equal or larger standard value), F R= ripple frequency in Hz, R 1= value of resistor R1 in Ohms If an ADJ-bypass capacitor is used, the amplitude of the output ripple will be inde- pendent of the output voltage. If an ADJ- bypass capacitor is not used, the output ripple will be proportional to the ratio of the output voltage to the reference voltage: M = V OUT / VREF Where M = multiplier for the ripple seen when the ADJ pin is optimally bypassed. V REF =1.25V TYPICAL APPLICATION CIRCUITS LOAD ADJ SPX2810 V IN C 1 OUT IN 4.7µF C 2 I OUT R 1 V REF R 1 I OUT = + IN OUT I ADJ SPX2810 C1 R 1 R 2 VOUT VIN C 2 V OUT =V REF (1+R 2 /R1) +I ADJ R 2 V REF 50µA ADJ 4.7µF + |
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