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AN3959 Datasheet(PDF) 29 Page - STMicroelectronics

Part # AN3959
Description  The purpose of this application note is to describe
PDF  65 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3959 Datasheet(HTML) 29 Page - STMicroelectronics

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AN3959
Design guidelines for schematic and PCB layout
Doc ID 022081 Rev 3
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6.1.4
Snubber filter
The snubber circuit must be optimized for the specific application. Starting values are
330 pF in series to 22 ohm. The power on this network is dependent on the power supply,
frequency and capacitor value according to the following formula:
P=C*f*(2*V)2
This power is dissipated on the series resistance.
Figure 28.
Differential-mode snubber circuit
For the common-mode snubber the formula to evaluate power is:
P=C*f*2*(V2)
This power is dissipated on the series resistance.
Figure 29.
Common-mode snubber circuit
C126
330p
R44
22
INxA
INxB
C127
330p
C130
330p
R45
22
R46
22
INxA
INxB



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