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L6986 データシート(PDF) 40 Page - STMicroelectronics

部品番号 L6986
部品情報  38 V, 2 A synchronous step-down switching regulator with 30 A quiescent current
PDF  68 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6986 データシート(HTML) 40 Page - STMicroelectronics

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DocID025376 Rev 7
Figure 28. Phase plot
The blue solid trace represents the transfer function including the sampling effect term (see
Equation 21 on page 35), the dotted blue trace neglects the contribution.
5.5
Compensation network design
The maximum bandwidth of the system can be designed up to fSW/6 to guarantee a valid
small signal model.
Equation 33
Equation 34
where:
Equation 35
p is defined by Equation 20 on page 35, gCS represents the current sense
transconductance (see Table 5: Electrical characteristics on page 8) and gm TYP the error
amplifier transconductance.
BW
fSW
6
---------
=
RC
2
 BW C
OUT VOUT

0.85V gCS gm TYP

----------------------------------------------------------------
=
fPOLE
p
2
-----------
=



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