Technical Specification
S15-48-12
Fig 6 shows the measured conducted EMC.
Six-sided metal shields for zero radiated
emission.
BTCPower
48Vin 12Vout 1.25A
TM
Characterization
General information
This unit has many operational characterized
aspects including thermal derating, efficiency,
start up and overshoot, output ripple & noise,
dynamic response, over current protection curve
and etc.
The following pages contain specific plots or
waveforms associated with the unit. Additional
comments for specific data are provided below.
Test Conditions
All data presented were taken with the unit
soldered to a test board, which is a 0.060” thick
printed circuit board. No heat sink was used
during all measurements. No airflow was used
except in de-rating rest.
For the input line, a 1µF /100V ceramic has been
used during the test. On the output side, a 10µF
tantalum capacitor with Esr < 0.12Ω and 1µF
ceramic capacitor have been used. Both input
and output capacitors were put close to the unit.
NOTE:
It is important to make sure that the components
on the unit do not exceed their rating.
Fig 6. Conducted EMC (150KHz-30MHz) test result, the
upper trace is the limit of EN55022 Class B specification
Fig 6A. The external filter circuit
C0 = 1.0 uF 250Vdc film capacitor
C1 = 1.0 uF 100Vdc ceramic capacitor
L1 = 2.2 mH Common mode choke
Start up
The startup scenarios are explained in Fig 7 and
8.
The measured waveforms showing the turn on
transient are given in Fig 9, for positive logic
control units.
Input Transient Withstand (ITW)
The unit can withstand input transient voltage with
100V/100ms pulse and never be damaged.
Efficiency
Efficiency vs. load current curve at different
inputs of 36V, 48V and 75V is given in Fig 10.
The ambient temperature is 25°C.
Efficiency with nominal input (48V) at different
ambient temperatures (25°C, 40°C and 55°C) is
also given in Fig 11.
Broadband TelCom Power, Inc. –
1719 S. Grand Avenue, Santa Ana, CA 92705 U.S.A.
P 7 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. ]
