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R6986 Datasheet(PDF) 39 Page - STMicroelectronics

Part # R6986
Description  38 V, 2 A synchronous step-down switching regulator
PDF  62 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

R6986 Datasheet(HTML) 39 Page - STMicroelectronics

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DocID026996 Rev 2
39/62
R6986
Closing the loop
62
where:
Equation 30
6.4
Total loop gain
In summary, the open loop gain can be expressed as:
Equation 31
Example 1
VIN = 12 V, VOUT = 3.3 V, ROUT = 2.2
Selecting L = 6.8 µH, COUT = 15 µF and ESR = 1 m, RC= 68 k, CC= 180 pF,
CP = 6.8 pF (please refer to Example 2), the gain and phase bode diagrams are plotted
respectively in Figure 27 and Figure 28.
Figure 27. Module plot
fZ
1
2
 R
1
CR1
-----------------------------------------
=
fp
1
2
R1 R
2
R1 R2
+
-------------------- CR1
-------------------------------------------------------
=
fZ fp
Gs

GDIV s
 G
CO s
 A
0 s


=



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