VIPER25HDTR STMicroelectronics, VIPER25HDTR Datasheet - Page 19

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VIPER25HDTR

Manufacturer Part Number
VIPER25HDTR
Description
IC OFFLINE CONV PWM OVP 16SOIC
Manufacturer
STMicroelectronics
Series
VIPer™ plusr
Datasheet

Specifications of VIPER25HDTR

Output Isolation
Isolated
Frequency Range
200 ~ 250kHz
Voltage - Input
8.5 ~ 23.5 V
Voltage - Output
800V
Power (watts)
24W
Operating Temperature
-40°C ~ 150°C
Package / Case
16-SOIC (0.154", 3.90mm Width)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
497-10066-2

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VIPER25
7.4
7.5
Power-down description
At converter power-down, the system loses regulation as soon as the input voltage is so low
that the peak current limitation is reached. The V
the V
interrupted and consequently the V
if the V
the power-down completed. This feature is useful to prevent converter’s restart attempts and
ensures monotonic output voltage decay during the system power-down.
Auto-restart description
If after a converter power-down, the V
sequence is not inhibited and will be activated only when the V
V
current generator restarts the V
below V
of a fault condition. After a fault condition, the charging current, I
instead of 3 mA of the normal power-up converter phase. This feature together with the low
V
restart attempts of the IC has a very long repetition rate and the converter works safely with
extremely low power throughput. The
event.
Figure 26. Timing diagram: behavior after short circuit
DD(RESTART)
DD(RESTART)
I
DDch
V
DDoff
DD(RESTART)
IN
(0.6mA)
DD(RESTART)
V
V
V
V
V
DDoff
V
DDon
V
is lower than the threshold V
FBolp
I
FBlin
DD
DD
FB
DS
threshold the power MOSFET is switched OFF, the energy transfers to the IC is
threshold (reported on
threshold (reported on
Short circuit occurs here
. The scenario above described is for instance a power-down because
Doc ID 15585 Rev 4
DD
0.3 x T
DD
capacitor charging only when the V
REPETITION
Table 7 on page 7
Table 7 on page 7
Figure 26
IN
voltages decreases, see
DRAIN_START
is higher than V
shows the IC behavioral after a short circuit
DD
, the start-up sequence is inhibited and
voltage drops and when it falls below
). This means that the HV start-up
) ensures that, after a fault, the
T
DRAIN_START,
REPETITION
Figure 23 on page 17
DD
DDch
voltage drops down the
Operation description
, is reduced to 0.6 mA
the power-up
DD
voltage drops
. Later,
time
time
time
time
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