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TL75xMxx 数据表(PDF) 6 Page - Texas Instruments |
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TL75xMxx 数据表(HTML) 6 Page - Texas Instruments |
6 / 23 page Applied Load Current Load Voltage ∆VL ∆IL ∆VL = ∆IL × ESR TL750Mxx-Q1, TL751Mxx-Q1 SGLS312J – SEPTEMBER 2005 – REVISED JUNE 2011 www.ti.com PARAMETER MEASUREMENT INFORMATION The TL750Mxx and TL751Mxx are low-dropout regulators. The output capacitor value and the parasitic equivalent series resistance (ESR) affect the bandwidth and stability of the control loop for these devices. For this reason, the capacitor and ESR must be carefully selected for a given operating temperature and load range. Figure 2 and Figure 3 can be used to establish the appropriate capacitance value and ESR for the best regulator transient response. Figure 2 shows the recommended range of ESR for a given load with a 10- µF capacitor on the output. Figure 2 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 3 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 2 can be adjusted for different capacitor values. For example, where the minimum load needed is 200 mA, Figure 2 suggests an ESR range of 0.8 Ω to 2 Ω for 10 µF. Figure 3 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 2 and Figure 3. Table 1. Compensation for Increased Stability at Low Currents 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 Figure 1. 6 Copyright © 2005–2011, Texas Instruments Incorporated |
类似零件编号 - TL75xMxx |
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类似说明 - TL75xMxx |
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