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MPZ2012S221A bảng dữ liệu(PDF) 43 Page - STMicroelectronics

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Giải thích chi tiết về linh kiện  38 V, 10 W synchronous iso-buck converter for isolated applications
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10.4
Output capacitors selection
Primary output capacitor
As in a standard buck converter, the primary output capacitor is involved in:
•
Determining the output voltage ripple
•
Supporting load transient
•
Loop stability, by setting one pole and one zero in the transfer function
Considering the output voltage ripple requirement, the primary output capacitance should be selected according
to the following equation:
COUT_pri=
ΔIpri
8∙fSW∙ΔVOUT_pri−ESR∙ΔIpri
(46)
Normally, MLCC capacitors are the best choice for the output capacitor, therefore the ESR contribution is
negligible and Eq. (46) can be simplified.
Secondary output capacitor
The secondary output capacitor supplies the secondary output load current during the tON (when diode D1 is
reverse biased) and its value defines the secondary output voltage ripple (ΔVOUT).
COUT_sec= IOUT_sec∙D
ΔVOUT_sec∙fSW
(47)
L6983I
Output capacitors selection
DS14040 - Rev 1
page 43/56



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