VIPER53-E View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'VIPER53-E' PDF : 36 Pages View PDF
VIPer53 - E
Standby mode
Equation 3
PSTBY
=
1--
2
•
FSWnom •
Ip2(VCOMPbl) • Lp
Note:
Where Ip(VCOMPbl2) is the peak Power MOSFET current corresponding to a compensation
voltage of VCOMPbl (1V).
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:
Equation 4
PSWstby
=
P-----S---T---B----Y-
PRST
•
FSWnom
The ratio between the nominal and standby switching frequencies can be as high as 4,
depending on the Lp value and input voltage.
Figure 20. Standby mode implementation
ton
3
600ns
Minimum
turn on
350ns
1
2
VVCCOOMMPPsodff
VCOMPbl
VCOMP
PIN
PRST
PSTBY
3
FSWstby
1
2
FSWnom
FSW
21/36
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