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TDA3616 Datasheet(PDF) 11 Page - NXP Semiconductors |
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TDA3616 Datasheet(HTML) 11 Page - NXP Semiconductors |
11 / 20 page 2000 Jan 14 11 Philips Semiconductors Objective specification Multiple voltage regulator with battery detection TDA3616 Application information NOISE The noise at the output of the regulator depends on the bandwidth of the regulator, which can be adjusted by the output capacitor CL. Table 1 shows the noise figures. The noise on the supply line depends on the value of the supply capacitor CP and is caused by a current noise (the output noise of the regulator is translated into a current noise by the output capacitor). When a high frequency capacitor of 220 nF (with an electrolytic capacitor of 100 µF connected in parallel) is connected directly between pins VP and GND the noise is minimized. Table 1 Noise figures Note 1. Measured at a bandwidth of 10 Hz to 100 kHz. STABILITY The regulator is stabilized by the output capacitor CL. The value of the output capacitor can be selected using the diagram shown in Fig.8. The following two examples show the effects of the stabilization circuit using different values for the output capacitor. Remark: The behaviour of ESR as a function of the temperature must be known. Example 1 The regulator is stabilized using an electrolytic output capacitor of 68 µF (ESR = 0.5 Ω). At Tamb = −40 °C the capacitor value is decreased to 22 µF and the ESR is increased to 3.5 Ω. The regulator will remain stable at a temperature of Tamb = −40 °C. Example 2 The regulator is stabilized using an electrolytic output capacitor of 10 µF (ESR = 3.3 Ω). At Tamb = −40 °C the capacitor value is decreased to 3 µF and the ESR is increased to 23.1 Ω. The regulator will be unstable at a temperature of Tamb = −40 °C. This can be solved by using a tantalum capacitor of 10 µF. IO (mA) NOISE FIGURE ( µV)(1) CL =10 µFCL =47 µFCL = 100 µF 0.5 58 50 45 50 250 200 180 handbook, full pagewidth 2 0 1 0.68 (1) (2) 10 output capacitor ( µF) MBK118 4 6 8 stable region 100 1000 ESR ( Ω) Fig.8 Curve for selecting the value of the output capacitor. (1) Maximum Equivalent Series Resistance (ESR). (2) Minimum ESR. |
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