參數(shù)資料
型號(hào)： PM6680ATR
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： 0.4 A DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, QCC32
封裝： 5 X 5 MM, LEAD FREE, VFQFPN-32
文件頁(yè)數(shù)： 26/48頁(yè)
文件大?。?/td> 1932K
代理商： PM6680ATR
Design guidelines
PM6680A
32/48
9.4
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 (m
)
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
)
D
1
(
I
D
)
D
1
(
I
D
I
2
1
2
1
CinRMS
×
+
×
=
相關(guān)PDF資料
PDF描述
PM6680A 0.4 A DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, QCC32
PM6680TR 0.4 A DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, QCC32
PM6685TR DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, QCC32
PM6686 SWITCHING CONTROLLER, QCC32
PM75B6L1C060 AC MOTOR CONTROLLER, DMA19
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