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Inrush current solution with bypass SCR
Features
Two high-temperature thyristors (SCR) in
D²PAK package to bypass the inrush
resistor
Compact SMD solution: 26 x 26 mm (≈ 1 sq.
in)
Simple drive circuit: 2 low voltage transistors
and 7 resistors (no MCU)
Requires an unregulated power supply (12 V
typ.; created from a secondary winding)
Compatible with PFC and fly-back converter
Suitable for applications from 50 W up to
800 W (230 V
RMS
, T
AMB
= 60 °C)
Input voltage range: 90-265 V
AC
, 50/60 Hz
Robust and immune (2 kV IEC 61000-4-5,
2.5 kV IEC 61000-4-4) and low EMI noise
(EN55014) solution
RoHS compliant
Description
The STEVAL-SCR001V1 is a low cost evaluation
board for testing ST inrush current limitation
solutions.
Based on an analog control circuit with only
discrete components, it offers a compact and
reliable alternative to relays to bypass inrush
current limiting resistors in power converters.
Its drive circuit is self-synchronized to the AC line.
Working in pulsed mode, it allows low gate drive
consumption and no SCR reverse losses.
Additionally, the 50 mA SCR TN5015H-6G
provides better immunity to Electrical Fast
Transients (EFT).
The power supply of the circuit can be created
from a secondary winding of a PFC or an
auxiliary power supply used to drive transistor
and power the system MCU. With no adjustment
needed when 12 V unregulated power is
supplied, and only 5 wires to connect, this board
can be easily implemented on existing PFC or fly-
back converters.
It is suitable for applications with peak current up
to 5 A (at 60 °C ambient temperature).
