hv110 Supertex, Inc., hv110 Datasheet - Page 10

• Manufacturer Part Number: hv110
• Description: Power-over-ethernet Interface Pd Controller Meets Ieee802.3af Tm Standard
• Manufacturer: Supertex, Inc.

Operation with External Auxiliary Power
Supply
There may be cases, when the PD has to be
powered by an external Aux power supply, when the
PD does not have a PSE at the other end of the Cat
5 cable. In such cases, the PD can be powered by
an external power supply as shown. By connecting
the power source, before the HV110 controller, the
PD will still operate correctly.
For additional information on DC/DC controllers and power supplies for PoE applications, see the
following:
©2004 Supertex Inc. All rights reserved. Unauthorized use or reproduction prohibited.
Supertex Inc. does not recommend the use of its products in life support applications and will not knowingly sell its products for use in such applications unless it receives an
adequate "products liability indemnification insurance agreement." Supertex does not assume responsibility for use of devices described and limits its liability to the replacement of
devices determined to be defective due to workmanship. No responsibility is assumed for possible omissions or inaccuracies. Circuitry and specifications are subject to change
without notice. For the latest product specifications, refer to the Supertex website: http://www.supertex.com. For complete liability information on all Supertex products, refer to the
most current databook or to the Legal/Disclaimer page on the Supertex website.
Doc. #: DSFP-HV110
Figure 11. Powering HV110 from an Auxiliary power source
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The higher voltage rating of HV110, will address any
voltage spikes up to 90V without the use of any
external Zener diodes for input protection. HV110
with its internal current limit and fault timing features
will provide a reliable power source to the PD and
will allow the smooth transfer of data between the
Data terminal and the Powered Device. It may be
necessary to connect a blocking diode to prevent
any reverse current from being fed back into the
Cable to the remote side.
1235 Bordeaux Drive, Sunnyvale, CA 94089
TEL: [phone] / FAX: [phone]
www.supertex.com
HV110
A061104