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TL751M05CKTGR Datasheet(PDF) 6 Page - Texas Instruments |
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TL751M05CKTGR Datasheet(HTML) 6 Page - Texas Instruments |
6 / 22 page www.ti.com PARAMETER MEASUREMENT INFORMATION Applied Load Current Load Voltage ∆VL ∆IL ∆VL = ∆IL × ESR 0 1 2 3 4 5 4.5 3.5 2.5 1.5 0.5 0 0.01 0.015 0.02 0.025 0.03 0.035 0.04 200 µF 1000 µF 1/ESR 0.005 400 µF Not Recommended Recommended Min ESR Potential Instability Region of Best Stability 100 µF 22 µF 10 µF Max ESR Boundary Region of Best Stability Min ESR Boundary 3 2.8 2.6 2.4 2.2 2 1.8 1.6 1.4 1.2 1 0.8 0.6 0.4 0.2 0 0.1 0 0.2 0.3 0.4 0.5 IL − Load Current Range − A This Region Not Recommended for Operation CL = 10 µF CI = 0.1 µF f = 120 Hz Potential Instability Region TL750M SERIES, TL751M SERIES LOW-DROPOUT VOLTAGE REGULATORS SLVS021K – JANUARY 1988 – REVISED OCTOBER 2006 The TL750Mxx 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. Figure 1 and Figure 2 can establish the capacitance value and ESR range for the best regulator performance. Figure 1 shows the recommended range of ESR for a given load with a 10- µF capacitor on the output. This figure also 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 because it is the worst case. Figure 2 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. This figure establishes the amount that the minimum ESR limit shown in Figure 1 can be adjusted for different capacitor values. For example, where the minimum load needed is 200 mA, Figure 1 suggests an ESR range of 0.8 Ω to 2 Ω for 10 µF. Figure 2 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 allows an ESR range of 0.13 Ω to 2 Ω , achieving an expanded ESR range by using a larger capacitor at the output. For better stability in low-current applications, a small resistance placed in series with the capacitor (see Table 1) is recommended, so that ESRs better approximate those shown in Figure 1 and Figure 2. Table 1. Compensation for Increased Stability at Low Currents ESR PART ADDITIONAL MANUFACTURER CAPACITANCE TYP NUMBER RESISTANCE <br/> AVX 15 µF 0.9 Ω TAJB156M010S 1 Ω <br/> <br/> KEMET 33 µF 0.6 Ω T491D336M010AS 0.5 Ω <br/> OUTPUT CAPACITOR <br/> EQUIVALENT SERIES RESISTANCE (ESR) STABILITY vs vs LOAD CURRENT RANGE EQUIVALENT SERIES RESISTANCE (ESR) Figure 1. Figure 2. 6 Submit Documentation Feedback |
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