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L3751 Datasheet(PDF) 25 Page - STMicroelectronics

Part # L3751
Description  Wide 6 V to 75 V input voltage synchronous buck controller
PDF  41 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L3751 Datasheet(HTML) 25 Page - STMicroelectronics

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The resultant control loop and other transfer function gains are shown in the figure below. Type II compensation –
Bode plot.
Figure 25. Type II compensation - Bode plot
7.3
Type III compensation network
If fzESR is higher than the target loop bandwidth, as usually happens if the output filter is based on MLCC
ceramic capacitors, a type III compensation network must be designed.
Figure 26. Type III compensation network
EA
ZF
RU
RD
COMP
VREF
V OUT
FB
CP
CF
RF
ZS
RS
CS
The type III compensation network transfer function, from VOUT to COMP, is computed in the equation below:
L3751
Type III compensation network
DS13841 - Rev 1
page 25/41



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