viper53esp STMicroelectronics, viper53esp Datasheet - Page 12

• Manufacturer Part Number: viper53esp
• Description: Off-line Primary Switch
• Manufacturer: STMicroelectronics

Standby Mode
12/31
Where Ip(V
voltage of V
burst mode does not depend on the input voltage.
The standby frequency F
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.
COMPbl2
COMPbl
Minimum
turn on
.Standby Mode Implementation
350ns
600ns
P
ton
P
P
STBY
RST
IN
) is the peak Power MOSFET current corresponding to a compensation
(1V). Note: The power point PSTBY where the converter is going into
V
V
COMPsd
COMPoff
3
F
SWstby
SWstby
3
2
V
is given by:
COMPbl
P
SWstby
DocRev1
1
=
F
SWnom
P
---------------- - F
P
STBY
RST
1
2
V
SWnom
COMP
F
SW
VIPer53EDIP - E / VIPer53ESP - E