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#33204
Subject to error and alteration
5. USB Isolator Industry, 4kV, #33204
Function
The Wiesemann & Theis USB-Isolator Industry #33204 galvanically
isolates low-speed and full-speed USB connections with an
isolation voltage of at least 4000V DC. The Isolator thereby
prevents unwanted current which could otherwise flow between the
connected devices over the data and supply lines of the USB. The
Isolator is simply inserted into the existing USB line.
Power supply of the insulator
The USB-Isolator #33204 is generally powered by the USB host and
supplies the connected terminal device through an integrated DC-
DC converter with power.
Only when connecting bus-powered terminal devices which draw
more than 300mA from the USB is use of an additional power
supply necessary. Power is then provided via a 5.5/2.1mm plug to
the underside of the device housing on the upstream side of the
Isolator.
This measure ensures galvanic isolation for all powering options:
the terminal device always receives its voltage through the
integrated DC-DC converter, which features an isolation voltage of
min. 6 kV.
A suitable plug-in power supply unit is included with the isolator. In
principle, however, any 5V DC power supply unit with USB output
can be used, which supplies a sufficient output current and which
has the characteristics described in the safety instructions.
1
NOTE
When using a 5V power supply unit with a hollow plug, its polarity
must be observed: outer contact = „+“, middle contact = „-“. Otherwi-
se the internal fuse of the isolator will be destroyed.