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5001 Datasheet(PDF) 9 Page - Silicon Laboratories |
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5001 Datasheet(HTML) 9 Page - Silicon Laboratories |
9 / 13 page Si3402B-EVB Rev. 1.1 9 4. BOM Options The Si3402B non-isolated EVB has been compensated for eight different output voltage and filter combinations: 3.3 V output standard ESR 1000 µF 6.3 V filter 5 V output standard ESR 1000 µF 6.3 V filter 9 output standard ESR 470 µF 16 V filter 12 V output standard ESR 470 µF 16 V filter 3.3 V output low ESR 560 µF 6.3 V filter 5 V output low ESR 560 µF 6.3 V filter 9 V output low ESR 330 µF 16 V filter 12 V output low ESR 330 µF 16 V filter For the standard ESR capacitor, the ESR increase at very low temperatures may cause a loop stability issue. A typical evaluation board has been shown to exhibit instability under very heavy loads at –20 °C. Due to self-heating, this condition is not a great concern. However, using a low ESR filter capacitor solves this problem (but requires some recompensation of the feedback loop). The low ESR capacitor also improves load transient response and output ripple. The Si3402B (non–isolated) EVB was designed with a very simple compensation consisting of R7 and C7. The standard evaluation board is optimized for a standard ESR filter capacitor for 5 V output. The following table gives the options that have been tested for other situations. VOUT R6 (To Adjust Output Voltage) Filter Cap C5 (Type FM are Low ESR) Filter Cap Part Number (Panasonic) R7 C7 3.3 V 4.64 k 1000µF, 6.3V ECA0JM102 47k 1nF 3.3 V 4.64 k 560 µF, 6.3 V EEUFM0J561 47 k 1nF 5.0 V 8.66 k 1000µF, 6.3V ECA0JM102 47k 1nF 5.0 V 8.66 k 560 µF, 6.3 V EEUFM0J561 47 k 1nF 9.0 V 18.2 k 470 µF, 16 V ECA1CM471 47 k 1nF 9.0 V 18.2 k 330 µF, 16 V EEUFM1C331 47 k 1nF 12.0 V 25.5 k 470 µF, 16 V ECA1CM471 47 k 1nF 12.0 V 25.5 k 330 µF, 16 V EEUFM1C331 47 k 1nF |
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