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SQE48T50012 DC-DC Converter
36-75 VDC Input; 1.2 VDC @ 50 A Output
Data Sheet
Characterization
General Information
The converter has been characterized for many
operational aspects, to include thermal derating
(maximum load current as a function of ambient
temperature and airflow) for vertical and horizontal
mounting, efficiency, startup and shutdown
parameters, output ripple and noise, transient
response to load step-change, overload, and short
circuit.
Test Conditions
All data presented were taken with the converter
soldered to a test board, specifically a 0.060” thick
printed wiring board (PWB) with four layers. The top
and bottom layers were not metalized. The two inner
layers, comprised of two-ounce copper, were used to
provide traces for connectivity to the converter.
The lack of metalization on the outer layers as well
as the limited thermal connection ensured that heat
transfer from the converter to the PWB was
minimized. This provides a worst-case but consistent
scenario for thermal derating purposes.
All measurements requiring airflow were made in the
vertical and horizontal wind tunnel using Infrared (IR)
thermography and thermocouples for thermometry.
Ensuring components on the converter do not
exceed their ratings is important to maintaining high
reliability. If one anticipates operating the converter
at or close to the maximum loads specified in the
derating curves, it is prudent to check actual
operating temperatures in the application.
Thermographic imaging is preferable; if this
capability is not available, then thermocouples may
be used. The use of AWG #40 gauge thermocouples
is recommended to ensure measurement accuracy.
Careful routing of the thermocouple leads will further
minimize measurement error. Refer to Fig. H for the
optimum measuring thermocouple locations.
Thermal Derating
Load current vs. ambient temperature and airflow
rates are given in Figure 1. Ambient temperature
was varied between 25°C and 85°C, with airflow
rates from 30 to 500 LFM (0.15 to 2.5 m/s).
For each set of conditions, the maximum load
current was defined as the lowest of:
(i) The output current at which any FET junction
temperature does not exceed a maximum temperature
of 120°C as indicated by the thermographic image, or
(ii) The temperature of the transformer does not
exceed 120°C, or
(iii) The nominal rating of the converter (50A at 1.2 V).
During normal operation, derating curves with
maximum FET temperature less or equal to 120°C
should not be exceeded. Temperature at both
thermocouple locations shown in Fig. H should not
exceed 120°C in order to operate inside the derating
curves.
Fig. H: Locations of the thermocouple for thermal testing.
Efficiency
Figure 2 shows the efficiency vs. load current plot for
ambient temperature of 25 oC, airflow rate of 300 LFM
(1.5 m/s) with vertical mounting and input voltages of
36 V, 48 V, and 72 V. Also, a plot of efficiency vs. load
current, as a function of ambient temperature with
Vin = 48 V, airflow rate of 200 LFM (1 m/s) with
vertical mounting is shown in Figure 3.
Power Dissipation
Figure 4 shows the power dissipation vs. load current
plot for Ta = 25 oC, airflow rate of 300 LFM (1.5 m/s)
with vertical mounting and input voltages of 36 V, 48
V, and 72 V. Also, a plot of power dissipation vs. load
current, as a function of ambient temperature with Vin
=48V, airflow rate of 200 LFM (1 m/s) with vertical
mounting is shown in Figure 5.
Startup
Output voltage waveforms, during the turn-on
transient using the ON/OFF pin for full rated load
currents (resistive load) are shown without and with
external load capacitance in Figure 6 and Figure 7
Ripple and Noise
Figure 10 shows the output voltage ripple waveform,
measured at full rated load current with a 10 μF
tantalum and 1μF ceramic capacitor across the output.
Note that all output voltage waveforms are measured
across a 1μF ceramic capacitor.
The input reflected-ripple current waveforms are
obtained using the test setup shown in Figure 11. The
corresponding waveforms are shown in Figure 12 and
Figure 13.
ZD-01731 Rev 2.0
www.power-one.com
Page 9 of 13
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