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SPX1117M3-L-1-5/TR Datasheet(PDF) 7 Page - Exar Corporation |
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SPX1117M3-L-1-5/TR Datasheet(HTML) 7 Page - Exar Corporation |
7 / 11 page S SP PX X1 11 11 17 7 8 80 00 0m mA A L Lo ow w D Drro op po ou utt V Vo olltta ag ge e R Re eg gu ulla atto orr © 2011 Exar Corporation 7/11 Rev. 2.1.0 layer on the backside of the substrate. Refer to table 1 for the results of the experiment. The thermal interaction from other components in the application can affect the thermal resistance of the SPX1117. The actual thermal resistance can be determined with experimentation. SPX1117 power dissipation is calculated as follows: Maximum Junction Temperature . Maximum junction temperature must not exceed 125°C. Fig. 19: Substrate Layout for SOT-223 RIPPLE REJECTION Ripple rejection can be improved by adding a capacitor between the ADJ pin and ground as shown in Figure 23. 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 10μF for an electrolytic aluminum capacitor or 2.2μF for a ceramic or solid tantalum capacitor (Fig 22). However the value of the ADJ-bypass capacitor should be chosen with respect to the following equation: 1 6.28 Where C: value of capacitor in Farads FR: ripple frequency in Hz R1: value of resistor R1 in ohms If an ADJ-bypass capacitor is used, the amplitude of the output ripple will be independent 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: Where M=multiplier for the ripple seen when the ADJ pin is optimally bypassed. VREF=1.25V Ripple rejection for the adjustable version is shown in Figure 20. Fig. 20: Ripple Rejection VIN=3.3V, VOUT=1.8V(adj), ILOAD=200mA OUTPUT VOLTAGE The output of the adjustable regulator can be set to any voltage between 1.25V and 15V. The value of VOUT can be quickly approximated using the formula 1.25 A small correction to this formula is required depending on the values of resistors R1 and R2, since the adjustable pin current (approx 50μA) flows through R2. When IADJ is taken into account, the formula becomes Where VREF=1.25V |
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