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TK71522AS Datasheet(PDF) 10 Page - TOKO, Inc |
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TK71522AS Datasheet(HTML) 10 Page - TOKO, Inc |
10 / 15 page Page 10 March 2001 TOKO, Inc. TK715xxAS APPLICATION INFORMATION INPUT-OUTPUT CAPACITORS Linear regulators require input and output capacitors in order to maintain regulator loop stability. The output capacitor should be selected within the Equivalent Series Resistance (ESR) range as shown in the graphs below for stable operation. The output capacitor C L can be reduced as the output voltage is increased. However, the output noise will increase as C L is reduced, so the largest value of CL possilbe is recommended (CL = 4.7 mF or more). Note: It is very important to check the selected manufacturers electrical characteristics (capacitance and ESR) over temperature. Range which can be used: Range which can be used: V OUT ³ 1.9V I OUT = 1 mA ~ Max, TANTALUM CAP. ³ 0.1 mF (CERAMIC CAP 0.22 mF + 2.2 W Capacitor used for evaluation: V OUT ³ 1.5V I OUT = 1 mA ~ Max, TANTALUM CAP. ³ 0.22 mF (CERAMIC CAP 0.22 mF + 2.2W V OUT ³ 2.8V I OUT = 1 mA ~ Max, MULTI LAYER CERAMIC CAP. ³ 0.68 mF V OUT ³ 2.0V I OUT = 1 mA ~ Max, MULTI LAYER CERAMIC CAP. ³ 1.0 mF V OUT ³ 1.5V I OUT = 1 mA ~ Max, MULTI LAYER CERAMIC CAP. ³ 4.7 mF ESR ≥ 0.01 Ω 0.68 µF ≤ CL ≤ 4.7 µF or More ESR ≥ 1.0 Ω 0.1 µF ≤ CL ≤ 0.22 µF or More MULTI LAYER CERAMIC CAP I OUT (mA) 5.0 1.6 1.5 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6 3.8 0 20 40 60 80 100 CL = 4.7 µF MLCC or More CL = 0.68 µF MLCC C IN = 0.1 µF Stable area is above the line UNSTABLE AREA UNDER AND TO THE LEFT 3.3 µF 2.2 µF 1.0 µF TANTALUM CAP I OUT (mA) 5.0 1.6 1.5 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6 3.8 0 20 40 60 80 100 Stable area is above the line UNSTABLE AREA UNDER AND TO THE LEFT CL = 0.22 µF (TANTALUM) or More CL = 0.1 µF TANTALUM 0.1 µF CIN = 0.1 µF |
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