S25-48-3.3 BTCPOWER [Broadband TelCom Power, Inc.], S25-48-3.3 Datasheet - Page 7

• Manufacturer Part Number: S25-48-3.3
• Description: 48Vin 3.3Vout 7A
• Manufacturer: BTCPOWER [Broadband TelCom Power, Inc.]

Technical Specification
S25-48-3.3, S25-48-3.3N
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 the de-rating test.
For the input line, a 1 F /100V ceramic capacitor
has been used during all these tests. On the
output side, a 10 F tantalum capacitor with Esr <
0.12 and 1 F ceramic capacitor has been used.
The capacitors on both the input and output sides
were 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.
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Broadband TelCom Power, Inc. –
1719 S. Grand Avenue, Santa Ana, CA 92705 U.S.A.
48Vin 3.3Vout 7A
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/ s. The input is 48V and a filter of 10 F
tantalum capacitor plus a 1 F ceramic capacitor
is put parallel to the output
Ripple and Noise
The output voltage waveform has been measured
at full load condition, with 10 F tantalum
capacitor plus 1 F 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 test, the output current vs.
the ambient temperature and the airflow rates
has been measured, and the results are given in
Fig 15.
The ambient temperature varies between 50 C
and 85 C with the airflow of 0, 100 and 200LFM
(0, 0.5m/s and 1m/s).
Others
Other curve and waveforms presented include
the output voltage vs. current curve (Fig 16) and
the input current ripple waveform at full load
condition (Fig 17)
.
PS S25-48-3.3 Rev 3 16-1-04
BTCPower
BTCPower
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