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AN4248 Datasheet(PDF) 20 Page - STMicroelectronics

Part # AN4248
Description  60 W PSU design details for water purifier system
PDF  46 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4248 Datasheet(HTML) 20 Page - STMicroelectronics

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AN4248
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DocID024214 Rev 1
11
Control loop
Opto coupler CTR = 1.
Required phase margin > 50°.
Figure 11 shows the resulting bode plot with the selection of following compensation values:
–Ccomp = C21 = 5.6 nF
–Rfb.= R31 = 0 E
–Cfb = C20 = 330 nF
–Ropto = R24 = 1.2 K
–Rbias = R27 = 2.2 K
Figure 11. Magnitude and phase plot at 230 Vac, full load 60 W
Figure 12. Magnitude and phase plot at 230 Vac, light load 6 W



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