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VIPER53-E Scheda tecnica(PDF) 21 Page - STMicroelectronics

Il numero della parte VIPER53-E
Spiegazioni elettronici  OFF-line primary switch
PDF  36 Pages
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

VIPER53-E Scheda tecnica(HTML) 21 Page - STMicroelectronics

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VIPer53 - E
Standby mode
21/36
Equation 3
Where Ip(VCOMPbl
2) 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:
Equation 4
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
P
STBY
1
2
---
F
SWnom
•
Ip
2
V
COMPbl
()
•
Lp
•
=
P
SWstby
P
STBY
P
RST
-----------------
F
SWnom
•
=
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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