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VIPER28LN Scheda tecnica(PDF) 23 Page - STMicroelectronics

Il numero della parte VIPER28LN
Spiegazioni elettronici  Off-line high voltage converters
PDF  29 Pages
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

VIPER28LN Scheda tecnica(HTML) 23 Page - STMicroelectronics

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VIPER28
Operation descriptions
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Equation 7
Equation 8
The RFB(DYN) is the dynamic resistance seen by the FB pin and reported on Table 8 on
page 8
.
The CFB1 capacitor fixes the OLP delay and usually CFB1 results much higher than CFB.
The equation 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 24. FB pin configuration
Figure 25. 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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