S15-48-1.8 Datasheet, PDF (7/11 Pages) Broadband TelCom Power, Inc. – 48Vin 1.8Vout 6A

Technical Specification
S15-48-1.8
48Vin 1.8Vout 6A
BTCPower ^{T M}
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.
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 and 10, for both
positive and negative logic control units.
Efficiency
Efficiency vs. load current curve at different
inputs of 36V, 48V and 75V is given in Fig 11.
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 12.
Dynamic Response
The dynamic response of the unit at load step is
shown in Fig 13. The output load current change
from 50% to 75% and return to 50% at the slew
of 0.1A/µs. The input is 48V and a filter of 10µF
tantalum capacitor and 1µF ceramic capacitor is
used parallel to the output.
Ripple and Noise
The output voltage waveform has been measured
at full load condition, with 10µF tantalum
capacitor plus 1µF Ceramic capacitor closely
parallel to the unit’s output. Fig 14 shows the
output ripple and noise waveform.
Thermal De-rating
For thermal de-rating, output current vs. ambient
temperature and airflow rates has been tested,
and the test results are given in Fig 15.
Ambient temperature varies between 55°C and
90°C with the airflow of 0, 100 and 200LFM (0,
0.5m/s and 1m/s).
Others
Other curve and waveforms presented include
output voltage vs. current curve (Fig 16) and
input current ripple waveform at full load condition
(Fig 17)
Broadband TelCom Power, Inc. – 1719 S. Grand Avenue, Santa Ana, CA 92705 U.S.A. P 7 of 11
Tel.: [phone] • Fax: [phone] • www.btcpower.com • Email: [e-mail] PS S15-48-1.8 Rev4 1-30-05