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L6986ITR Datasheet(PDF) 25 Page - STMicroelectronics

Part # L6986ITR
Description  38 V, 5 W synchronous iso-buck converter for isolated applications
PDF  60 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6986ITR Datasheet(HTML) 25 Page - STMicroelectronics

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whereas the zero is defined as:
fPHF= 1
2∙π∙R0∙C0+Cp 
(15)
5.3
Voltage divider
The contribution of the internal voltage divider for fixed output voltage devices is:
GDIV(s)= R2R1+R2=VFBVOUT
(16)
A small signal capacitor in parallel to the upper resistor (see figure below) of the voltage divider implements a
leading network (fzero < fpole), sometimes necessary to improve the system phase margin:
Figure 28. Leading network example
The Laplace transformer of the leading network is:
GDIV(s)= R2R1+R2∙1+sfZ1+sfP
(17)
where
fZ= 12∙π∙R1∙CR1
(18)
fP= 1
2∙π∙R1∙R2
R1+R2∙CR1
fZ<fP
5.4
Total loop gain
In summary, the open loop gain can be expressed as:
G (s)= GDIV(s)∙GC0(s)∙A0(s)
(19)
L6986I
Voltage divider
DS13647 - Rev 1
page 25/60



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