Technical Specification
S15-48-12
48Vin 12Vout 1.25A
BTCPower
TM
Protection Features
Input under voltage lockout (UVL)
The input voltage must be at least 35V for the
unit to turn on. Once the unit has been turned on,
it will shut off when the input voltage drops below
34V.
Safety Requirements (SR)
The unit meets UL/CSA/TUV safety requirements
per UL60950, TUV EN60950 and CSA C22.2
No.60950-00.
Basic insulation is provided
between input and output.
Caution:
The unit does NOT have a fuse inside. The safety
agencies require an external normal-blow fuse to be
used at the input side to achieve maximum safety. The
recommended fuse rating is 2A/100V.
Output Over-Current Protection (OCP)
The unit is protected against over current or short
circuit on the output. When sensing an over
current condition, the unit will enter constant
current operation and reduce the output voltage.
Upon short-circuit condition, the unit will shut
down.
After over-current or short circuit condition is
removed, the unit will resume normal operation
automatically.
Output Over Voltage Protection (OVP)
This unit does NOT have OVP function.
Over Temperature Protection (OTP)
This unit does NOT have OTP function.
Application Considerations
Input source Impedance
The unit has been designed to be stable with no
external capacitor 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.
An external capacitor will improve 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.
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 the whole system, for safety agencies
requirements, and for the combination of
the unit input side (primary side) and the
output side (secondary side), verify that
under a single fault, hazardous voltages
do not appear at the unit 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.
Electromagnetic Compatibility (EMC)
The unit’s conducted emission meets the
requirement of EN55022 Class B Specifications,
so no external input filter is needed unless a
stricter conducted EMI/EMC limitation is required
to satisfy or user has its own requirement on the
input.
Broadband TelCom Power, Inc. –
1719 S. Grand Avenue, Santa Ana, CA 92705 U.S.A.
P 6 of 12
Tel.: 714-259-4888 • Fax: 714-259-0840 • www.btcpower.com • Email: sales@btcpower.com PS S15-48-12 Rev4.2 21-1-05
BTCPOWER [ BROADBAND TELCOM POWER, INC. ]
