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L6986I データシート(PDF) 26 Page - STMicroelectronics

部品番号 L6986I
部品情報  38 V, 5 W synchronous iso-buck converter for isolated applications
PDF  60 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6986I データシート(HTML) 26 Page - STMicroelectronics

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5.5
Compensation network design
The maximum bandwidth of the system can be designed up to fSW/6 up to 150 kHz maximum to guarantee a valid
small signal model
RC= 2∙π∙BW∙COUT∙VOUT
0.85V∙gCS∙gm_typ
(20)
where:
fPOLE= ωP2∙π
(21)
ωP is defined by eq. (9) , gCS represents the current sense transconductance and gm TYP the error amplifier
transconductance.
CC=  52∙π∙RC∙BW
(22)
Example 1:
VIN = 12 V, VOUT_pri = 5.3 V, ROUT_pri = 5.6 Ω (corresponding to almost 1 A load).
Selecting the L6986I with VOUT_pri = 5.3 V, fSW = 500 kHz, Lpri = 18 µH, COUT_pri = 10 µF and ESR = 3 mΩ, RC
= 56 kΩ, CC = 680 pF, CP = 4.7 pF (please refer to Table 11), the gain and phase bode diagrams are plotted
respectively in Figure 29 and Figure 30.
Figure 29. Bode plote (magnitude)
Figure 30. Bode plot (phase)
L6986I
Compensation network design
DS13647 - Rev 1
page 26/60



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