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VIPER17HN Datasheet(PDF) 23 Page - STMicroelectronics

Part # VIPER17HN
Description  Off-line high voltage converters
PDF  31 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

VIPER17HN Datasheet(HTML) 23 Page - STMicroelectronics

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VIPER17
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 Figure 4 on
page 10
.
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
()
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



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