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A7987 Fiches technique(PDF) 19 Page - STMicroelectronics

No de pièce A7987
Description  61 V, 3 A asynchronous step-down switching regulator with adjustable current limitation for automotive
PDF  36 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

A7987 Fiches technique(HTML) 19 Page - STMicroelectronics

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Figure 12. Type II compensation - Bode plot
f Z1
f LC
f ZESR
f BW
f P1
E/A gain
G
LOOP,II
G
COMP,II
G
LC,II
6.4.2
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 13. 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:
A7987
Compensation network
DS12928 - Rev 3
page 19/36



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