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AN4007 Scheda tecnica(PDF) 14 Page - STMicroelectronics

Il numero della parte AN4007
Spiegazioni elettronici  In several applications, such as LCD or plasma TVs
PDF  33 Pages
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4007 Scheda tecnica(HTML) 14 Page - STMicroelectronics

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Test board: design and evaluation
AN4007
14/33
Doc ID 022455 Rev 2
The ripple at the switching frequency superimposed at the output voltage was also
measured. The board is provided with an LC filter to further reduce the ripple without
reducing the overall output capacitor’s ESR.
The voltage ripple across the output connector (VOUT) and before the LC filter (VOUT_PRE)
were measured in order to verify the effectiveness of the LC filter:
Figure 13 shows the
output voltage ripple at full load when the converter input voltage is 115 VAC; while Figure 14
shows the output voltage ripple at full load when the converter input voltage is 230 VAC.
Figure 13.
Output voltage ripple at full load and 230 VAC
AM11352v1
Ch1 (Pk-Pk): 18.73 mV
Ch2 (Pk-Pk): 298.3 mV
M: 20.0 µs/div
VOUT_PRE
VOUT



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