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L7987L Datasheet(PDF) 26 Page - STMicroelectronics

Part # L7987L
Description  Adjustable current limitation
PDF  41 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L7987L Datasheet(HTML) 26 Page - STMicroelectronics

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Application information
L7987L
26/41
DocID026362 Rev 3
After choosing the regulator bandwidth (typically FBW < 0.2 • FSW ) and a value for RU,
usually between 1 k
 and 50 k, in order to achieve CF and CP not comparable with
parasitic capacitance of the board, the RF required value is computed by Equation 22.
Select CF in order to place FZ1 below FLC (typically 0.1 • FLC)
Select CP in order to place FP1 at 0.5 • FSW
Equation 23
The resultant control loop and other transfer functions gain are shown in Figure 12.
Figure 12. Type II compensation - bode plot
CF
1
2
 R
F
0.1 fLC
------------------------------------------------ CP
;
1
2
 R
F
0.5 fSW
-------------------------------------------------
==



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