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VIPER27LN 데이터시트(PDF) 22 Page - STMicroelectronics

부품명 VIPER27LN
상세설명  Off-line high voltage converters
PDF  31 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

VIPER27LN 데이터시트(HTML) 22 Page - STMicroelectronics

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Operation descriptions
VIPER27
22/31
Doc ID 15133 Rev 5
Equation 7
Equation 8
The RFB(DYN) is the dynamic resistance seen by the FB pin.
The CFB1 capacitor fixes the OLP delay and usually CFB1 results much higher than CFB.
The
Equation 5 can be still used to calculate the OLP delay time but CFB1 has to be
considered instead of CFB. Using the alternative compensation network, the designer can
satisfy, in all case, the loop stability and the enough OLP delay time alike.
Figure 28.
FB pin configuration
Figure 29.
FB pin configuration
()
1
FB
)
DYN
(
FB
FB
1
FB
)
DYN
(
FB
PFB
R
R
C
2
R
R
f
⋅
⋅
⋅
π
⋅
+
=
()
)
DYN
(
FB
1
FB
1
FB
1
PFB
R
R
C
2
1
f
+
⋅
⋅
π
⋅
=
From sense FET
4.8V
BURST
PWM
CONTROL
Cfb
To PWM Logic
BURST-MODE
REFERENCES
BURST-MODE
LOGIC
+
-
PWM
+
-
OLP comparator
To disable logic
4.8V
From sense FET
PWM
CONTROL
+
-
PWM
BURST
To disable logic
+
-
OLP comparator
To PWM Logic
BURST-MODE
LOGIC
Cfb1
Rfb1
Cfb
BURST-MODE
REFERENCES



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