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VIPER53EDIP-E Datasheet(PDF) 12 Page - STMicroelectronics

Part # VIPER53EDIP-E
Description  OFF-line Primary Switch
PDF  31 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

VIPER53EDIP-E Datasheet(HTML) 12 Page - STMicroelectronics

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Standby Mode
VIPer53EDIP - E / VIPer53ESP - E
12/31
DocRev1
Where Ip(VCOMPbl2) is the peak Power MOSFET current corresponding to a compensation
voltage of VCOMPbl (1V). Note: The power point PSTBY where the converter is going into
burst mode does not depend on the input voltage.
The standby frequency FSWstby is given by:
The ratio between the nominal and standby switching frequencies can be as high as 4,
depending on the Lp value and input voltage.
Figure 4.
.Standby Mode Implementation
P
SWstb y
P
STBY
P
RST
-----------------
F
SWn om
•
=
VCOMP
VCOMPsd
VCOMPbl
VCOMPoff
600ns
350ns
FSW
PIN
FSWnom
FSWstby
PSTBY
PRST
Minimum
1
3
2
1
2
3
ton
turn on



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