VIPER06XN STMicroelectronics, VIPER06XN Datasheet - Page 16

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VIPER06XN

Manufacturer Part Number
VIPER06XN
Description
AC/DC Switching Converters VIPer 800V Plus Fixed Freq 30kHz
Manufacturer
STMicroelectronics
Type
PWM Low-Standby High Performance Controllerr
Datasheet

Specifications of VIPER06XN

Rohs
yes
Output Voltage
800 V
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
Through Hole
Package / Case
DIP-7
Maximum Operating Temperature
+ 125 C
Minimum Operating Temperature
- 25 C
Number Of Outputs
1
Output Power
30 mW
Factory Pack Quantity
50

Available stocks

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Part Number
Manufacturer
Quantity
Price
Part Number:
VIPER06XN
Manufacturer:
ST
0
Oscillator
9
10
11
16/28
Oscillator
The switching frequency is internally fixed at 30 kHz or 60 kHz or 115 kHz (respectively part
numbers VIPER06Xx, VIPER06Lx and VIPER06Hx).
The switching frequency is modulated by approximately ±3 kHz (30 kHz version) or ±4 kHz
(60 kHz version) or ±8 kHz (115 kHz version) at 230 Hz (typical) rate, so that the resulting
spread spectrum action distributes the energy of each harmonic of the switching frequency
over a number of sideband harmonics having the same energy on the whole, but smaller
amplitudes.
Soft startup
During the converter’s startup phase, the soft-start function progressively increases the
cycle-by-cycle drain current limit, up to the default value I
further limited and the output voltage is progressively increased, reducing the stress on the
secondary diode. The soft-start time is internally fixed to t
in
after a fault event.
This function helps prevent saturation of the transformer during startup and short-circuit.
Adjustable current limit set point
The VIPER06 includes a current-mode PWM controller. The drain current is sensed cycle-
by-cycle through the integrated resistor R
inverting input of the PWM comparator, see
voltage is equal to the voltage derived from the COMP pin, the power MOSFET is switched
OFF.
In parallel with the PWM operations, the comparator OCP, see
the level of the drain current and switches OFF the power MOSFET in case the current is
higher than the threshold I
The level of the drain current limit I
between the LIM and GND pins. Current is sunk from the LIM pin through the resistor R
and the setup of I
R
When the LIM pin is left open or if R
fixed to its default value, I
LIM
Table 7 on page
is shown in
Figure 13 on page
Dlim
8, and the function is activated for any attempt of converter startup and
depends on the level of this current. The relation between I
Dlim
Dlim
, as given in
Doc ID 022794 Rev 1
, see
Dlim
Table 7 on page
LIM
11.
can be reduced using a resistor R
has a high value (i.e. > 80 kΩ), the current limit is
SENSE
Table 7 on page
Figure 2 on page
and the voltage is applied to the non-
8.
Dlim
SS
8.
, see typical value
. In this way the drain current is
4. As soon as the sensed
Figure 2 on page
LIM
connected
4, checks
Dlim
VIPER06
and
LIM

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