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TL-SCSI285PWRG4 Datasheet(PDF) 5 Page - Texas Instruments |
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TL-SCSI285PWRG4 Datasheet(HTML) 5 Page - Texas Instruments |
5 / 12 page TL-SCSI285 FIXED-VOLTAGE REGULATORS FOR SCSI ACTIVE TERMINATION SLVS065F – NOVEMBER 1991 – REVISED JULY 1999 5 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 COMPENSATION CAPACITOR SELECTION INFORMATION The TL-SCSI285 is a low-dropout regulator. This means that the capacitance loading 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 2 and 3 can be used to establish the capacitance value and ESR range for best regulator performance. 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 1 0.8 0.6 1.4 1.6 0.4 0.2 0 ESR OF OUTPUT CAPACITOR vs LOAD CURRENT STABILITY vs ESR IL – Load Current – A Applied Load Current Load Voltage ∆ IL ∆ VL Min ESR Boundary CL = 22.0 µF CI = 0.1 µF TJ = 25°C 10 µF 100 µF 400 µF 1000 µF Figure 3 Max ESR Boundary Not Recommended Potential Instability 200 µF Region of Best Stability Not Recommended Potential Instability Recommended Min ESR 22 µF Figure 2 |
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