L7987L datasheet(26/41 Pages) STMICROELECTRONICS

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L7987L データシート(PDF) 26 Page - STMicroelectronics

部品番号	L7987L

部品情報	Adjustable current limitation

PDF	41 Pages

Scroll/Zoom	100%

メーカー	STMICROELECTRONICS [STMicroelectronics]

ホームページ	http://www.st.com

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26 / 41 page

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

 R

0.1 fLC



------------------------------------------------ CP

;

 R

0.5 fSW



-------------------------------------------------

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