VIPER28 STMicroelectronics, VIPER28 Datasheet - Page 16

• Manufacturer Part Number: VIPER28
• Description: VIPerPlus family: fixed frequency high performance off line high voltage converter
• Manufacturer: STMicroelectronics

Operation descriptions
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Figure 19. Timing diagram: normal power-up and power-down sequences
Figure 20. Soft-start: timing diagram
V
V
I
DRAIN_START
DD(RESTART)
DDch
V
DRAIN
V
(3mA)
V
DDoff
DDon
V
V
I
DD
DD
IN
Power-on
I
DRAIN
V
V
V
FBolp
I
V
FBlin
OUT
Dlim
FB
Regulated value
t
SS
Doc ID 15028 Rev 4
(soft start)
Normal operation
T
OLP-delay
regulation is lost here
Power-off
t
t
t
V
HV startup is no more activated
IN
< V
DRAIN_START
time
time
time
time
VIPER28