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VIPER50B Datasheet(PDF) 3 Page - STMicroelectronics

Part No. VIPER50B
Description  SMPS PRIMARY I.C.
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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VIPER50B Datasheet(HTML) 3 Page - STMicroelectronics

 
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PINS FUNCTIONAL DESCRIPTION
DRAIN PIN:
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.
SOURCE PIN:
Power MOSFET source pin. Primary side circuit
common ground connection.
VDD PIN :
This pin provides two functions :
- It corresponds to the low voltage supply of the
control part of the circuit. If VDD goes below 8V,
the start-up current source is activated and the
output power MOSFET is switched off until the
VDD voltage reaches 11V. During this phase,
the internal current consumption is reduced,
the VDD pin is sourcing a current of about 2mA
and the COMP pin is shorted to 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 VDD at
13V. For secondary regulation, a voltage
between 8.5V and 12.5V will be put on VDD pin
by transformer design, in order to 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 VDD voltage, which
cannot overpass 13V. The output voltage will
be somewhat higher than the nominal one, but
still under control.
COMP 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
(whatever is the configuration) to provide a
burst mode operation in case of negligible
output power or open load condition.
OSC PIN :
An RT-CT network must be connected on that pin
to define the switching frequency. Note that
despite the
connection of RT to VDD,no
significant frequency change occurs for VDD
varying from 8V to 15V. It provides also a
synchronisation capability, when connected to an
external frequency source.
ORDERING NUMBERS
PENT AW ATT HV
PENTAW AT T HV (022Y)
Pow erSO-10
VIPer50B
VIPer50B (022Y)
VI Per50BSP
VIPER50B/BSP
3/20


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