TM
Technical Specification
SQ100-48-3.3,
SQ100-48-3.3N
Data Sheet
SQO100-48-3.3, SQO100-48-3.3N
48Vin 3.3Vout 25A
Characterization
General information
Figure 23 shows that maximum output power
derating vs. ambient air temperature with airflow
rates of 0LFM through 300 LFM. At Vin=48v.
The SQ(SQO) unit has many operational
characterized aspects, including thermal derating,
efficiency, start up and down timing parameter,
overshoot, output ripple & noise, dynamic
response to load, and over current protection
curves.
Figure 24 shows output power derating vs.
ambient aur temperature with airflow rates of
0LFM through 300LFM. At Vin=48v. ( Open
frame, without heatsink )
The following pages contain specific plots or
waveforms associated with the unit. Additional
comments for specific data are provided below.
Efficiency
Efficiency vs. load current curve is given below.
The ambient temperature is 25°C, airflow is
200LFM(1m/s), and the input voltage is 36V, 48V,
and 75V conditions.
Test Conditions
All data presented herein were taken with the unit
soldered to a test board, which is a 0.060” thick
printed circuit board. All measurements require
an airflow wind with airflow meter measuring the
airflow LFM value.
Figure 14 shows that Efficiency at nominal output
voltage vs. output current for various Input
voltage.
For the input line, a 47uF/100V electrolytic
capacitor with Esr < 1 W is used in the test. It is
better to make the 47uF capacitor closed to the
unit. For the output, a 10uf tantalum capacitor
with Esr < 0.12W and 1uF ceramic capacitor has
been used for the test.
Start up
During the turn on transient using the On/Off pin
for full rated current and No load conditions, the
output voltage waveforms are given in the below.
Also it is better when these two capacitors are
close to the unit.
Fig 9, Fig 10 and Fig 11 show that all different
kind of start up waveform.
Note:
It is important to make sure that the components on
the unit do not exceed their rating.
Ripple and Noise
The output voltage waveform measured at No
load and Full load current, with 10uf tantalum and
1uf ceramic capacitor across to close the unit.
Thermal Derating
For thermal derating, output current vs. ambient
temperature and airflow rates are tested, and the
test graphic is shown in Fig 23.
Figure 21 and Figure 22 show that output voltage
Ripple & Noise at Vin=48v and different load
condition.
Ambient temperature was varied between 25°C
and 85°C, with airflow rates from 0 LFM to
300LFM (0 to 1.5 m/s).
Broadband TelCom Power, Inc. 1719 S. Grand Avenue, Santa Ana, CA 92705 U.S.A.
P 10 of 16
Tel.: 714-259-4888 • Fax: 714-259-0840 • www.btcpower.com • Email: sales@btcpower.com • PS SQ100-48-3.3, SQO100-48-3.3 Rev1 4-2-03
BTCPOWER [ BROADBAND TELCOM POWER, INC. ]
