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YNS12S16 DC-DC Converter Data Sheet
9.6-14 VDC Input; 0.7525-5.5 VDC Programmable @ 16 A
All measurements requiring airflow were made in
vertical and horizontal wind tunnel facilities 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;
Fig. D: Location of the thermocouple for thermal testing.
if this capability is
not available, then
thermocouples may be used. di/dt recommends
the use of AWG #40 gauge thermocouples to
ensure measurement accuracy. Careful routing of
the thermocouple leads will further minimize
measurement error. Refer to Fig. D for optimum
measuring thermocouple location.
Thermal Derating
Load current vs. ambient temperature and airflow
rates are given in Figs. x.1 for maximum
temperature of 120 °C. Ambient temperature was
varied between 25 °C and 85 °C, with airflow rates
from 30 to 500 LFM (0.15m/s to 2.5 m/s), and
vertical converter mounting. The airflow during the
testing is parallel to the short axis of the converter,
going from pin 1 and pin 6 to pins 2 – 5.
For each set of conditions, the maximum load
current was defined as the lowest of:
(i) The output current at which either any MOSFET
temperature did not exceed a maximum specified
temperature (120°C) as indicated by the
Efficiency
Figure x.2 shows the efficiency vs. load current
plot for ambient temperature of 25 oC, airflow rate
of 200 LFM (1 m/s) and input voltages of 9.6 V,
12 V, and 14 V.
Power Dissipation
Fig. x.3 shows the power dissipation vs. load
current plot for Ta = 25 oC, airflow rate of 200 LFM
(1 m/s) with vertical mounting and input voltages
of 9.6 V, 12 V, and 14 V.
Ripple and Noise
The output voltage ripple waveform is measured at
full rated load current. Note that all output voltage
waveforms are measured across a 1 ? F ceramic
capacitor.
The output voltage ripple and input reflected ripple
current waveforms are obtained using the test
setup shown in Fig. E.
i S i C
Nex - s Series
thermographic image, or
(ii) The maximum current rating of the converter
(16 A)
1 ? H
source
inductance
V source
C IN
4x47 ? F
ceramic
capacitor
TM
DC/DC
Converter
1 ? F
ceramic
capacitor
C O
100 ? F
ceramic
capacitor
Vout
During normal operation, derating curves with
maximum FET temperature less than or equal to
120 °C should not be exceeded. Temperature on
the PCB at the thermocouple location shown in
Fig. D should not exceed 120 °C in order to
operate inside the derating curves.
Fig. E: Test Setup for measuring input reflected ripple
currents, i s and i c and output voltage ripple.
MCD10196 Rev. 1.0, 21-Jun-10
Page 8 of 27
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