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PM6680 bảng dữ liệu(PDF) 34 Page - STMicroelectronics

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7.13.4
Input capacitors selection
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 17
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.
Table 11.
Output capacitor manufacturer
Manufacturer
Series
Capacitor value (uF)
Rated voltage (V)
ESR max (mΩ)
SANYO
POSCAP TPB,TPD, TPE
100 to 470
2.5 to 6.3
12 to 65
PANASONIC
SPCAP UD, UE
100 to 470
2 to 6.3
7 to 18
Table 12.
Input capacitor manufacturer
Manufacturer
Series
Capacitor value (uF)
Rated voltage (V)
TAYIO YUDEN
UMK325BJ106KM-T
10
50
TAYIO YUDEN
GMK325BJ106MN
10
35
TDK
C3225X5R1E106M
10
25
)
D
1
(
I
D
)
D
1
(
I
D
I
2
2
2
2
1
2
1
1
CinRMS
−
×
×
+
−
×
×
=



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