Datasheet

VIPer53 - E Standby mode
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Equation 3
Where Ip(V
COMPbl
2
) is the peak Power MOSFET current corresponding to a compensation
voltage of V
COMPbl
(1V).
Note: The power point PSTBY where the converter is going into burst mode does not depend on
the input voltage.
The standby frequency F
SWstby
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
•=
V
COMP
V
COMPsd
V
COMPbl
V
COMPoff
600ns
350ns
F
SW
P
IN
F
SWnom
F
SWstby
P
STBY
P
RST
Minimum
1
3
2
1
2
3
ton
turn on