VIPER17LDTR STMicroelectronics, VIPER17LDTR Datasheet - Page 25
![IC OFFLINE CONV PWM OVP 16SOIC](/photos/7/32/73267/viper17ldtr_sml.jpg)
VIPER17LDTR
Manufacturer Part Number
VIPER17LDTR
Description
IC OFFLINE CONV PWM OVP 16SOIC
Manufacturer
STMicroelectronics
Series
VIPer™ plusr
Datasheet
1.VIPER17LDTR.pdf
(31 pages)
Specifications of VIPER17LDTR
Output Isolation
Isolated
Frequency Range
54 ~ 66kHz
Voltage - Input
8.5 ~ 23.5 V
Voltage - Output
800V
Power (watts)
12W
Operating Temperature
-40°C ~ 150°C
Package / Case
16-SOIC (0.154", 3.90mm Width) Exposed Pad
For Use With
497-9052 - BOARD EVAL FOR VIPER17LN497-9050 - BOARD DEMO BASED ON VIPER17HN497-9007 - BOARD EVAL BASED ON VIPER17497-8513 - BOARD EVAL VIPER17HN 6W SMPS497-8250 - BOARD EVAL FOR VIPER17497-6447 - BOARD EVAL FOR VIPER17L497-6446 - BOARD EVAL FOR VIPER17H
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
497-7048-2
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
VIPER17LDTR
Manufacturer:
ST
Quantity:
20 000
VIPER17
7.13
2
The VIPER17 is protected against short circuit of the secondary rectifier, short circuit on the
secondary winding or a hard-saturation of fly-back transformer. Such as anomalous
condition is invoked when the drain current exceed the threshold I
page 7
To distinguish a real malfunction from a disturbance (e.g. induced during ESD tests) a
“warning state” is entered after the first signal trip. If in the subsequent switching cycle the
signal is not tripped, a temporary disturbance is assumed and the protection logic will be
reset in its idle state; otherwise if the I
switching cycles a real malfunction is assumed and the power MOSFET is turned OFF.
The shutdown condition is latched as long as the device is supplied. While it is disabled, no
energy is transferred from the auxiliary winding; hence the voltage on the V
decays till the V
The start up HV current generator is still off, until V
V
and the converter switching restarts if the V
the device enters in auto-restart mode. This behavioral results in a low-frequency
intermittent operation (Hiccup-mode operation), with very low stress on the power circuit.
See the timing diagram of
Figure 32. Hiccup-mode OCP: timing diagram
DD(RESTART)
V
nd
DD
(RESTART)
I
V
DRAIN
level overcurrent protection and hiccup mode
V
V
Vcc
DRAIN
V
).
DD
DD
I
DMAX
DD
on
off
. After this condition the V
DD
under voltage threshold (V
Secondary diode is shorted here
Secondary diode is shorted here
Figure 32
Doc ID 14419 Rev 7
.
DMAX
DD
capacitor is charged again by 600 µA current,
DDon
threshold is exceeded for two consecutive
DDoff
occurs. If the fault condition is not removed
), which clears the latch.
DD
voltage goes below its restart voltage,
DMAX
Operation descriptions
(see
DD
Table 8 on
capacitor
25/31
t
t
t
t
t
t