Prelim. Specification
HBO70A-48-3.3
48Vin
3.3Vout 70A
BTCPower
TM
Application information
Input Source Impedance
The unit has been designed to be stable with no
external capacitors when used in a low
inductance input and output circuit.
However in many applications, the inductance
with the distribution from the power source to the
input of the unit can affect the stability of the unit.
The addition of 100uF electrolytic capacitor with
an Esr < 1Ω (at 100khz) across the input can
ensure the stability of the unit. Also in many
applications, the user has to use decoupling
capacitors at the output load, to ensure the hold
up time for the load.
Safety Requirements and Considerations
The unit meets the American and International
safety regulatory requirement UL1950. Basic
insulation is also provided between the input side
and the output side.
To meet safety agencies requirements, an input
line fuse must be used external to the unit. An
15A fuse or less with a normal blow rate must be
used to meet the safety agencies requirements. A
minimum 42LFM airflow should also be provided
if the unit is intended to operate at full power
without heatsink.
•
If the input source is non-SELV ( ELV or a
hazardous voltage greater than 60 Vdc and less
than or equal to 75 Vdc), for the unit output to be
considered meeting the requirements of safety
extra low voltage (SELV), all of the following must
be met:
•
The input source is to be provided with
reinforced insulation from any hazardous
voltage, including the ac main.
The input pins of the unit are not operator
accessible.
For whole system, for safety agencies
requirements, and for the combination of
the unit’s input side (primary side) and the
unit’s output side (secondary side), verify
that under a single fault, hazardous
voltages do not appear at the unit’s output
side (secondary side).
Never ground either of the input pins of
the unit without grounding one of the
output pins. This may allow a non-SELV
voltage to appear between the output pin
and ground.
•
•
Worldwide Headquarter:
Broadband TelCom Power, Inc.
1719 S. Grand Avenue, Santa Ana, CA 92705 U.S.A.
Tel.: 714-259-4888 Fax: 714-259-0840
Email: sales@btcpower.com
European Headquarter:
Broadband TelCom Power Europe B. V.
Dukaatstraat 14, 4879AD Etten-Leur, The Netherlands
Tel.: 31-76-5038350 Fax: 31-76-5012038
Email: info.europe@btcpower.com
www.btcpower.com
Broadband TelCom Power, Inc.
1719 S. Grand Avenue, Santa Ana, CA 92705 U.S.A.
P
7 of 7
Tel.: 714-259-4888 • Fax: 714-259-0840 • www.btcpower.com • Email: sales@btcpower.com •
PS HBO70A-48-3.3 Rev1 9-15-03
BTCPOWER [ BROADBAND TELCOM POWER, INC. ]
