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PM6686TR Datasheet(PDF) 39 Page - STMicroelectronics |
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PM6686TR Datasheet(HTML) 39 Page - STMicroelectronics |
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39 / 50 page  PM6686 Application information Doc ID 15281 Rev 4 39/50 10.1.2 Input capacitor In a buck topology converter the current that flows into the input capacitor is a pulsed current with zero average value. The input RMS current of the two switching sections can be roughly estimated as follows: Equation 12 Where D1, D2 are the duty cycles and I1, I2 are the maximum load currents of the two sections. Input capacitor should be chosen with an RMS rated current higher than the maximum RMS current given by both sections. Tantalum capacitors are good in term of low ESR and small size, but they occasionally can burn out if subjected to very high current during the charge. Ceramic capacitors have usually a higher RMS current rating with smaller size and they remain the best choice. Below there is a list of some ceramic capacitor manufacturers. 10.1.3 Output capacitor The selection of the output capacitor is based on the ESR value and on the voltage rating rather than on the capacitor value Cout. The output capacitor has to satisfy the output voltage ripple requirements. Lower inductor value can reduce the size of the choke but increases the inductor current ripp le ΔIL. Since the voltage ripple VRIPPLEout is given by: Equation 13 A low ESR capacitor is required to reduce the output voltage ripple. Switching sections can work correctly even with 15mV output ripple. Table 14. Inductor manufacturer Manufacturer Series Inductor value (µH) RMS current (A) Saturation current (A) COILCRAFT MSS-1048 3,3 7,22 7,6 COILCRAFT MSS-1260 3,3 9,7 7 COILCRAFT MLC-1550 2,5 16,5 11,4 Table 15. Input capacitor manufacturer Manufacturer Series Capacitor value (µF) Rated voltage (V) TAYIO YUDEN UMK325BJ106 KM-T 10 50 TAYIO YUDEN GMK325BJ106MN 10 35 ) D 1 ( I D ) D 1 ( I D I 2 2 2 2 1 2 1 1 CinRMS − × × + − × × = L out RIPPLEout I R V Δ × = |
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