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VIPER31 Datasheet

Energy saving offline high voltage converter

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VIPER31
Datasheet
Energy saving offline high voltage converter
Features
• 800 V avalanche-rugged power MOSFET to cover ultra-wide VAC input range
• Embedded HV startup and sense FET
• Current mode PWM controller
• Drain current limit protection (OCP):
– 850 mA (VIPER318)
~ AC
DIN
RIN
– 990 mA (VIPER319)
VCC
OVP
DRAIN
VIPER31
• Wide supply voltage range: 4.5 V to 30 V
FB CONTROL
– < 20 mW @ 230 VAC in no-load;
COMP UVP GND
CIN
DAUX
– < 430 mW @ 230 VAC, 25 0mW output load
R1
C1
• Jittered switching frequency reduces the EMI filter cost:
C3
R2
C2
D2
LOUT
VOUT
– 30 kHz ± 7% (X type)
GND
D1
COUT
GND
– 60 kHz ± 7% (L type)
– 132 kHz ±7% (type H)
• Embedded E/A with 1.2 V reference
• Built-in soft-start for improved system reliability
• Protections with automatic restart:
– overload/short-circuit (OLP)
– thermal shutdown
– overvoltage
Product status link
• Protections without automatic restart:
– pulse-skip protection to avoid flux runaway
VIPER31
– undervoltage/disable
Product label
– max. duty cycle
Application
• Low power SMPS for home appliances, home automation, industrial,
consumers, lighting
• Low power adapters
Description
The VIPER31 device is a high-voltage converter that smartly integrates an 800 V
avalanche rugged power MOSFET with PWM current-mode control..
The 800 V breakdown allows extended input voltage range to be applied, as well as
to reduce the size of the DRAIN snubber circuit. The IC can meet the most stringent
energy-saving standards as it has very low consumption and operates in pulse
frequency modulation at light load. Overvoltage and undervoltage protections with
separate and settable intervention thresholds are available at OVP and UVP pins
respectively. UVP can also be used as a disabling input for the entire SMPS, with
ultra-low residual input power consumption. Integrated HV startup, sense FET, error
amplifier and oscillator with frequency jitter allow a complete application to be
designed with a minimum component count.
Flyback, buck and buck boost topologies are supported.
DS13285 - Rev 2 - June 2020
For further information contact your local STMicroelectronics sales office.
www.st.com


STMicroelectronics Electronic Components Datasheet

VIPER31 Datasheet

Energy saving offline high voltage converter

No Preview Available !

VIPER31
Pin setting
1
Pin setting
Figure 1. Connection diagram
GND
DRAIN
N.C.
DRAIN
VCC
N. A.
DRAIN
DRAIN
UVP
N. C.
OVP
N. C.
FB
N. C.
COMP
N. C.
Table 1. Pin description
Pin
number
Name
Function
Ground and MOSFET source. Connection of both the source of the internal MOSFET and the return of
1
GND the bias current of the device. All of the groundings of bias components must be tied to a trace going to
this pin and kept separate from the pulsed current return.
2
N. C. Not connected. When designing the PCB, this pin can be soldered to GND.
Controller Supply. An external storage capacitor has to be connected across this pin and GND. The
3
VCC
pin, internally connected to the high-voltage current source, provides the VCC capacitor charging current
at startup. A small bypass capacitor (0.1 μF typ.) in parallel, placed as close as possible to the IC, is also
recommended, for noise filtering purposes.
4
N.A.
Not available for user. This pin is mechanically connected to the controller die pad of the frame. In order
to improve noise immunity, it is highly recommended to connect it to GND.
Undervoltage Protection. If VUVP falls below the internal threshold VUVP_th (0.4 V typ.) for more than
tUVP_DEB time (30 ms, typ.), the IC is disabled, and its consumption reduced to ultra-low values. When
5
UVP
VUVP rises above VUVP_th, the device waits for a tUVP_REST time interval (30 ms, typ.) then resumes
switching. The pin can be used to realize an input undervoltage protection or as a disabling input for the
entire SMPS, with ultra-low residual input power consumption. If the feature is not required, the pin must
be left open, which excludes the function.
Overvoltage protection. If VOVP exceeds the internal threshold VOVP_th (4 V typ.) for more than
tOVP_DEB time (250 μsec, typ.), the PWM is disabled in auto-restart for tOVP_REST (500 msec, typ.) until
6
OVP
the OVP condition is removed, after that it restarts switching with soft-start phase. OVP pin can be used
to realize an input overvoltage protection (or, in non-isolated topologies, an output overvoltage
protection).
If the feature is not required, the pin must be connected to GND, which excludes the function.
Direct feedback. It is the inverting input of the internal transconductance E/A, internally referenced to
7
FB
1.2 V with respect to GND. In non-isolated converter, the output voltage information is directly fed into the
pin through a voltage divider. In primary regulation, the FB voltage divider is connected to the VCC. The
E/A is disabled if FB is connected to GND pin.
DS13285 - Rev 2
page 2/40



Part Number VIPER31
Description Energy saving offline high voltage converter
Maker STMicroelectronics
Total Page 3 Pages
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VIPER31 Datasheet PDF





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