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TDA3609 Datasheet(PDF) 16 Page - NXP Semiconductors |
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TDA3609 Datasheet(HTML) 16 Page - NXP Semiconductors |
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16 / 20 page  1997 Aug 15 16 Philips Semiconductors Preliminary specification Multiple voltage regulator with switch and ignition buffers TDA3609JR Application information NOISE Table 1 Noise figures Note 1. Measured at a bandwidth of 200 kHz. The noise on the supply line depends on the value of the supply capacitor and is caused by a current noise (output noise of the regulators is translated into a current noise by means of the output capacitors). When a high frequency capacitor of 220 nF in parallel with an electrolytic capacitor of 100 µF is connected directly to pins 1 and 14 (supply and ground) the noise is minimal. STABILITY The regulators are made stable with the external connected output capacitors. REGULATOR NOISE FIGURE ( µV)(1) CO =10 µFCO =47 µFCO = 100 µF 1 tbf 150 tbf 2 tbf 150 tbf 3 tbf 200 tbf The output capacitors can be selected using the graphs of Figs 8 and 9. When an electrolytic capacitor is used, the temperature behaviour of this output capacitor can cause oscillations at a low temperature. The next 2 examples show how an output capacitor value is selected. Example 1 Regulators 1 and 3 are made stable with an electrolytic output capacitor of 220 µF (ESR = 0.15 Ω). At −30 °C the capacitor value is decreased to 73 µF and the ESR is increased to 1.1 Ω. The regulator will remain stable at −30 °C. Example 2 Regulator 2 is made stable with a 10 µF electrolytic capacitor (ESR = 3 Ω). At −30 °C the capacitor value is decreased to 3 µF and the ESR is increased to 23.1 Ω. Using Fig.9, the regulator will be instable at −30 °C. Solution Use a tantalum capacitor of 10 µF or a larger electrolytic capacitor. To avoid problems with stability at low temperatures, the use of tantalum capacitors is recommended. handbook, halfpage 0 0.1 1 10 C ( µF) MGK612 stable region maximum ESR 100 R ( Ω) 20 15 10 5 Fig.8 Curve for selecting the value of output capacitor for regulators 1 and 3. handbook, halfpage 2 0 0.22 110 C ( µF) MGK613 4 6 8 10 12 stable region maximum ESR minimum ESR 100 R ( Ω) 14 Fig.9 Curve for selecting the value of output capacitor for regulator 2. |
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