VIPER06XS STMicroelectronics, VIPER06XS Datasheet - Page 17

• Manufacturer Part Number: VIPER06XS
• Description: AC/DC Switching Converters Fixed VIPer Plus 800V 30kHz 30mW
• Manufacturer: STMicroelectronics
• Type: PWM Low-Standby High Performance Controllerr

Specifications of VIPER06XS

• Product Category: AC/DC Switching Converters
• Rohs: yes
• Input / Supply Voltage (max): 23.5 V
• Input / Supply Voltage (min): 11.5 V
• Switching Frequency: 30 kHz
• Supply Current: 1.3 mA
• Operating Temperature Range: - 40 C to + 150 C
• Mounting Style: SMD/SMT
• Package / Case: SSO-10
• Number Of Outputs: 1
• Output Power: 30 mW

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
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
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
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
page
When the voltage V
burst mode, see
When the voltage V
as the deliverable output power, will reach its limit.
Figure 22. Feedback circuit
REF_FB
8.
18.
, a single resistor has to be connected from the output to the FB pin. For higher
R
R
H
L
V
OUT
Figure
No
Isolation
COMP
Section 13 on page
22, in case of an isolated power supply, the internal error amplifier has to
COMP
COMP
dynamic range is between V
Isolation
rises above the V
drops below the voltage threshold V
Doc ID 022794 Rev 1
FB
Without Isolation:
switch open & E/A enabled
With Isolation:
switch closed & E/A disabled
18.
V
REF_FB
COMPH
-
+
E/A
COMP
COMPL
V
REF
threshold, the peak drain current, as well
SW
R
Figure 2 on page 4
COMP
BUS
Figure
and V
nR
from R
22. The current loop has to be
V
COMPL
COMPH
COMPL
R
SENSE
COMP
REF_FB,
+
+
-
-
, the converter enters
FB pin and COMP pin
, respectively to and
shown in
and the
see
PWM stop
to PWM
Table 7 on
Figure 23 on
Figure
22.
17/28