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AN2982 Datasheet(PDF) 12 Page - STMicroelectronics

Part # AN2982
Description  This application note describes the STEVAL-ILB005V2 demonstration board equipped with the L6585DE lighting controller
PDF  31 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2982 Datasheet(HTML) 12 Page - STMicroelectronics

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Designing the application
AN2982
12/31
Doc ID 15599 Rev 1
Figure 7.
Bode plot with simple compensation network: |Gloop|MAX < 35dB
For example, an RC-series network is connected between the INV and COMP pin. The
obtained Gloop(s) can be written as:
Equation 28
A phase margin equal to 45° is obtained at Vin = 277 Vac using Ccomp=1.5 µF and
Rcomp=39 kΩ. At minimum input voltage the phase margin is equal to 85°.
Higher values of Ccomp or a lower value of Cout can also improve the PFC performance.
Figure 8.
Bode plot with enhanced compensation network: |Gloop|MAX < 35 dB and
Φ margin > 45°
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