VIPER20A-E STMicroelectronics, VIPER20A-E Datasheet - Page 8

IC SWIT SMPS CM OTP PENTAWATT5

VIPER20A-E

Manufacturer Part Number
VIPER20A-E
Description
IC SWIT SMPS CM OTP PENTAWATT5
Manufacturer
STMicroelectronics
Series
VIPER™r
Datasheet

Specifications of VIPER20A-E

Output Isolation
Isolated
Frequency Range
90 ~ 200kHz
Voltage - Input
8 ~ 15 V
Voltage - Output
700V
Power (watts)
57W
Operating Temperature
25°C ~ 125°C
Package / Case
Pentawatt-5 HV (Bent and Staggered Leads)
Number Of Outputs
1
Output Voltage
700 V (Min)
Output Current
500 mA
Mounting Style
Through Hole
Switching Frequency
200 KHz
Fall Time
100 ns
Rise Time
50 ns
Synchronous Pin
No
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
497-6796-5
VIPER20A-E
Pin description
3
Pin description
3.1
Drain pin (Integrated Power MOSFET drain):
Integrated Power MOSFET drain pin. It provides internal bias current during start-up via an
integrated high voltage current source which is switched off during normal operation. The
device is able to handle an unclamped current during its normal operation, assuring self
protection against voltage surges, PCB stray inductance, and allowing a snubberless operation
for low output power.
3.2
Source pin:
Power MOSFET source pin. Primary side circuit common ground connection.
3.3
V
pin (power supply):
DD
This pin provides two functions :
It corresponds to the low voltage supply of the control part of the circuit. If V
8V, the start-up current source is activated and the output power MOSFET is switched off
until the V
voltage reaches 11V. During this phase, the internal current consumption is
DD
reduced, the V
DD
ground. After that, the current source is shut down, and the device tries to start up by
switching again.
This pin is also connected to the error amplifier, in order to allow primary as well as
secondary regulation configurations. In case of primary regulation, an internal 13V
trimmed reference voltage is used to maintain V
voltage between 8.5V and 12.5V will be put on V
stuck the output of the transconductance amplifier to the high state. The COMP pin
behaves as a constant current source, and can easily be connected to the output of an
optocoupler. Note that any overvoltage due to regulation loop failure is still detected by the
error amplifier through the V
will be somewhat higher than the nominal one, but still under control.
3.4
Compensation pin
This pin provides two functions :
It is the output of the error transconductance amplifier, and allows for the connection of a
compensation network to provide the desired transfer function of the regulation loop. Its
bandwidth can be easily adjusted to the needed value with usual components value. As
stated above, secondary regulation configurations are also implemented through the
COMP pin.
When the COMP voltage is going below 0.5V, the shut-down of the circuit occurs, with a
zero duty cycle for the power MOSFET. This feature can be used to switch off the
converter, and is automatically activated by the regulation loop (no matter what the
configuration is) to provide a burst mode operation in case of negligible output power or
open load condition.
8/34
pin is sourcing a current of about 2mA and the COMP pin is shorted to
voltage, which cannot overpass 13V. The output voltage
DD
VIPer20A-E
DD
at 13V. For secondary regulation, a
DD
pin by transformer design, in order to
DD
goes below

Related parts for VIPER20A-E