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VIPER25HD Datasheet(PDF) 17 Page - STMicroelectronics

Part No. VIPER25HD
Description  Off-line high voltage converters
Download  40 Pages
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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VIPER25HD Datasheet(HTML) 17 Page - STMicroelectronics

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VIPER25
Operation description
Doc ID 15585 Rev 4
17/40
As soon as the output voltage reaches the regulated value, the regulation loop takes over
and the drain current is regulated below its limit, IDlim, by the feedback voltage, which settles
at a value lower than the threshold VFBlin
Figure 22.
IDD current during start-up and burst mode
Figure 23.
Timing diagram: normal power-up and power-down sequences
BURST MODE
NORMAL MODE
START- UP
NORMAL MODE
I
DDch (-3 mA)
I
DD1
I
DD0
IDD
V
FBbm
VFB
VDRAIN
V
FBbmhys
V
FBlin
V
FBolp
VDD
V
DDoff
V
DDon
t
t
t
t
I
DD
V
DD
V
DRAIN
V
DDon
time
V
IN
V
DRAIN_START
Power-on
Power-off
Normal operation
regulation is lost here
V
IN < VDRAIN_START
HV startup is no more activated
V
DDoff
V
DD(RESTART)
I
DDch (3mA)
time
time
time


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