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VIPER53-E データシート(PDF) 27 Page - STMicroelectronics

部品番号 VIPER53-E
部品情報  OFF-line primary switch
PDF  36 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

VIPER53-E データシート(HTML) 27 Page - STMicroelectronics

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VIPer53 - E
Transconductance error amplifier
27/36
The lowest load gives another condition for stability: The frequency FBW1 must not encounter
the second order slope generated by the load pole and the integrator part of the error
amplifier. This condition can be met by adjusting the CCOMP value:
Equation 13
The above formula gives a minimum value for CCOMP. It can be then increased to provide a
natural soft start function as this capacitor is charged by the error amplifier current capacity
ICOMPhi at start-up.
Figure 22. Typical compensation network
C
COMP
R
L1
C
OUT
⋅
6.3
Gm
R
COMP
2
⋅⋅
------------------------------------------------------
P
OUT1
P
MAX
-------------------
⋅
>
P
OUT1
V
OUT
2
R
L1
---------------
=
With:
15V
VDD
OSC
DRAIN
SOURCE
COMP
TOVL
Rcomp
Ccomp
10nF



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