VIPER17HN STMicroelectronics, VIPER17HN Datasheet - Page 15

IC OFFLINE CONV PWM OVP OCP 8DIP

VIPER17HN

Manufacturer Part Number
VIPER17HN
Description
IC OFFLINE CONV PWM OVP OCP 8DIP
Manufacturer
STMicroelectronics
Series
VIPer™ plusr
Datasheet

Specifications of VIPER17HN

Output Isolation
Isolated
Frequency Range
103 ~ 127kHz
Voltage - Input
8.5 ~ 23.5 V
Voltage - Output
800V
Power (watts)
12W
Operating Temperature
-40°C ~ 150°C
Package / Case
8-DIP (0.300", 7.62mm), 7 Leads
Output Voltage
800 V
Output Power
1 W
Input Voltage
- 0.3 V
Switching Frequency
115 KHz
Operating Temperature Range
- 40 C to + 150 C
Mounting Style
Through Hole
Duty Cycle (max)
80 %
Number Of Outputs
1
For Use With
497-9050 - 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
497-6950-5
VIPER17HN

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VIPER17
7.3
Power-up and soft-start up
If the input voltage rises up till the device start threshold, V
begins to grow due to the I
high voltage start up circuit. If the V
page
See
The IC is powered by the energy stored in the capacitor on the VDD pin, C
the self-supply circuit (typically an auxiliary winding of the transformer and a steering diode)
develops a voltage high enough to sustain the operation.
C
value higher than V
switching operation before the controller receives any energy from the auxiliary winding.
The following formula can be used for the V
Equation 1
The t
estimated by applicator according to the output stage configurations (transformer, output
capacitances, etc.).
During the converter start up time, the drain current limitation is progressively increased to
the maximum value. In this way the stress on the secondary diode is considerably reduced.
It also helps to prevent transformer saturation. The soft-start time lasts 8.5 ms and the
feature is implemented for every attempt of start up converter or after a fault.
Figure 22. I
VDD
Figure 23 on page
SSaux
6) the power MOSFET starts switching and the HV current generator is turned OFF.
capacitor must be sized enough to avoid fast discharge and keep the needed voltage
is the time needed for the steady state of the auxiliary voltage. This time is
I
DDch
DD
V
(-3 mA)
DRAIN
V
V
V
V
V
V
current during start-up and burst mode
FBbm
DDoff
V
FBolp
I
I
I
DDon
FBlin
DD
DD1
DD0
DD
START- UP
FB
DDoff
16.
threshold. In fact, a too low capacitance value could terminate the
DDch
NORMAL MODE
Doc ID 14419 Rev 7
current (see
C
DD
VDD
voltage reaches V
=
----------------------------------------
V
I
DD
DDch
DDon
Table 7 on page
capacitor calculation:
×
BURST MODE
t
V
SSaux
DDoff
DDon
DRAIN_START
6) coming from the internal
threshold (see
Operation descriptions
, the V
NORMAL MODE
VDD
t
t
t
t
V
FBbmhys
Table 7 on
DD
, until when
voltage
15/31

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