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GDQ54S12B-4A DC-DC Converter
Technical Manual
In the input remote power supply application, the parasitic inductor of the remote
power supply cable and the input capacitor as well as the power brick may
resonate, causing the power input voltage to be unstable. As a result, the PSU
may experience a power outage due to undervoltage. Therefore, it is
recommended that input capacitors be selected according to the input capacitor
ESR conditions as shown in following figure.
Select the appropriate curve based on the application scenario, and ensure that
the input capacitor ESR is within the upper and lower limits in the curve. Then
there will be no input resonance.
Figure 8-1 Input resonance formula
V
: input power voltage
s
L1: inductance of the line from the input power
to the converter port
R1: resistance of the line from the input power
to the converter port
Resonance does not happen if the following formulas are satisfied:
Issue 02 (2021-09-03)
8
Input Anti-resonance Method
;
Copyright © Huawei Technologies Co., Ltd.
8 Input Anti-resonance Method
C1: capacitance of the external capacitor
R
: equicalent series resistance (ESR) of the
e
external capacitor
24
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