VIPER06XN

Manufacturer Part NumberVIPER06XN
DescriptionAC/DC Switching Converters VIPer 800V Plus Fixed Freq 30kHz
ManufacturerSTMicroelectronics
TypePWM Low-Standby High Performance Controller
VIPER06XN datasheet
 


Specifications of VIPER06XN

RohsyesOutput Voltage800 V
Input / Supply Voltage (max)23.5 VInput / Supply Voltage (min)11.5 V
Switching Frequency30 kHzSupply Current1.3 mA
Operating Temperature Range- 40 C to + 150 CMounting StyleThrough Hole
Package / CaseDIP-7Maximum Operating Temperature+ 125 C
Minimum Operating Temperature- 25 CNumber Of Outputs1
Output Power30 mWFactory Pack Quantity50
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VIPER06
12
FB pin and COMP pin
The device can be used both in non-isolated and isolated topology. In non-isolated topology,
the feedback signal from the output voltage is applied directly to the FB pin as the inverting
input of the internal error amplifier having the reference voltage, V
page
8.
The output of the error amplifier sources and sinks the current, I
from the compensation network connected on the COMP pin. This signal is then compared
in the PWM comparator with the signal coming from the SenseFET in order to switch off the
power MOSFET on a cycle-by-cycle basis. See the
When the power supply output voltage is equal to the error amplifier reference voltage,
V
, a single resistor has to be connected from the output to the FB pin. For higher
REF_FB
output voltages the external resistor divider is needed. If the voltage on the FB pin is
accidentally left floating, an internal pull-up protects the controller.
The output of the error amplifier is externally accessible through the COMP pin and it’s used
for the loop compensation, usually an RC network.
As shown in
Figure
be disabled (FB pin shorted to GND). In this case an internal resistor is connected between
an internal reference voltage and the COMP pin, see
closed on the COMP pin through the opto-transistor in parallel with the compensation
network. The V
COMP
page
18.
When the voltage V
burst mode, see
Section 13 on page
When the voltage V
as the deliverable output power, will reach its limit.
Figure 22. Feedback circuit
V
OUT
R
H
No
R
Isolation
L
22, in case of an isolated power supply, the internal error amplifier has to
dynamic range is between V
COMPL
drops below the voltage threshold V
COMP
18.
rises above the V
COMP
COMPH
Without Isolation:
V
switch open & E/A enabled
With Isolation:
switch closed & E/A disabled
FB
-
E/A
V
+
REF_FB
Isolation
COMP
Doc ID 022794 Rev 1
FB pin and COMP pin
see
Table 7 on
REF_FB,
, respectively to and
COMP
Figure 2 on page 4
and the
Figure
Figure
22. The current loop has to be
and V
shown in
Figure 23 on
COMPH
, the converter enters
COMPL
threshold, the peak drain current, as well
REF
R
V
COMP
COMPL
PWM stop
+
-
SW
BUS
from R
SENSE
to PWM
+
nR
-
R
22.
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