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TL75LP12 데이터시트(PDF) 10 Page - Texas Instruments |
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TL75LP12 데이터시트(HTML) 10 Page - Texas Instruments |
10 / 15 page TL75LPxxQ SERIES TL75LPxxY SERIES LOW DROPOUT VOLTAGE REGULATORS SLVS073A − SEPTEMBER 1992 − REVISED AUGUST 1995 3−10 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443 PARAMETER MEASUREMENT INFORMATION The TL75LPxx series are low-dropout voltage regulators. This means that the capacitance is important to the performance of the regulator because it is a vital part of the control loop. The capacitor value and the equivalent series resistance (ESR) both affect the control loop and must be defined for the load range and the temperature range. Figures 3 and 4 can establish the capacitance value and ESR range for optimum regulator performance. Figure 3 shows the recommended range of ESR, measured at 120 Hz, for a given load with a 10- µF capacitor on the output. In addition, it shows a maximum ESR limit of 2 Ω and a load-dependent minimum ESR limit. For applications with varying loads, the lightest load condition should be chosen since it is the worst case. Figure 4 shows the relationship of the reciprocal of ESR to the square root of the capacitance with a minimum capacitance limit of 10 µF and a maximum ESR limit of 2 Ω. Figure 4 establishes the amount that the minimum ESR limit of Figure 3 can be adjusted for different capacitor values. For example, when the minimum load needed is 200 mA, Figure 3 suggests an ESR range of 0.8 Ω to 2 Ω for 10 µF. Figure 4 shows that changing the capacitor from 10 µF to 400 µF can change the ESR minimum by greater than 3/0.5 (or 6). Therefore, the new minimum ESR value is 0.8/6 (or 0.13 Ω). This now allows an ESR range of 0.13 Ω to 2 Ω. This expanded ESR range is achieved by using a larger capacitor at the output. For better stability in low-current applications, it is recommended that a small resistance be placed in series with the capacitor (see Table 1) so that the ESR better approximates those in Figures 3 and 4. Table 1. Compensations for Increased Stability at Low Currents MANUFACTURER CAPACITANCE ESR PART ADDITIONAL MANUFACTURER CAPACITANCE ESR TYP PART NUMBER ADDITIONAL RESISTANCE AVX 15 µF 0.9 Ω TAJB156M010S 1 Ω KEMET 33 µF 0.6 Ω T491D336M010AS 0.5 Ω 0.02 0.015 0.005 0 0 0.5 1 1.5 2 2.5 3 0.025 0.035 1/ESR 3.5 4 4.5 5 0.01 0.03 2.4 2.2 2 1.8 0 0.1 0.2 0.3 2.6 2.8 3 0.4 0.5 0.04 1.2 0.8 0.6 1.4 1.6 0.4 0.2 0 OUTPUT CAPACITOR EQUIVALENT SERIES RESISTANCE vs LOAD CURRENT OUTPUT CAPACITOR STABILITY vs EQUIVALENT SERIES RESISTANCE 1 This Region Not Recommended for Operation CL = 10 µF CI = 0.1 µF Max ESR Boundary Min ESR Boundary Region of Best Stability Potential Instability Region IL − Load Current − A 10 µF 22 µF 100 µF 200 µF 400 µF Region of Best Stability 1000 µF Not Recommended Potential Instability Recommended Min ESR 10 µF Figure 3 Figure 4 Applied Load Current Load Voltage ∆IL ∆VL ∆VL = ∆IL × ESR |
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