VIPER15

Manufacturer Part NumberVIPER15
DescriptionVIPerPlus family: quasi-resonant high performance off line high voltage converter
ManufacturerSTMicroelectronics
VIPER15 datasheet
 
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Operation description
Equation 11
The R
is the dynamic resistance seen by the FB pin and reported on
FB(DYN)
page
8.
The C
capacitor fixes the OLP delay and usually C
FB1
Equation 8 on page 29
considered instead of C
satisfy, in all case, the loop stability and the enough OLP delay time alike.
Figure 34. FB pin configuration (option 1)
Figure 35. FB pin configuration (option 2)
30/40
=
(
f
PFB
1
⋅ π
2
C
R
FB
1
can be still used to calculate the OLP delay time but C
. Using the alternative compensation network, the designer can
FB
PWM
CONTROL
Cfb
BURST-MODE
REFERENCES
PWM
CONTROL
Rfb1
Cfb
Cfb1
BURST-MODE
REFERENCES
Doc ID 15455 Rev 5
1
)
+
R
FB
1
FB
(
DYN
)
Table 8 on
results much higher than C
FB1
FB1
From sense FET
PWM
To PWM Logic
+
-
BURST
BURST-MODE
LOGIC
OLP comparator
To disable logic
+
-
4.8V
From sense FET
PWM
To PWM Logic
+
-
BURST
BURST-MODE
LOGIC
OLP comparator
To disable logic
+
-
4.8V
VIPER15
. The
FB
has to be