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YNS12S10 DC-DC Converter Data Sheet
9.6-14 VDC Input; 0.7525-5.5 VDC Programmable @ 10 A
Thermal Derating
Load current vs. ambient temperature and airflow
rates are given in Figs. x.1 to x.2 for maximum
temperature of 110 °C. Ambient temperature was
varied between 25 °C and 85 °C, with airflow rates
from 30 to 500 LFM (0.15 m/s to 2.5 m/s), and
vertical and horizontal converter mountings. The
airflow during the testing is parallel to the long axis of
the converter, going from pin 1 and pin 6 to pins 2–5.
For each set of conditions, the maximum load
current is defined as the lowest of:
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 μ 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) The output current at which any MOSFET
temperature does not exceed a maximum
specified temperature (110 °C) as indicated by the
thermographic image, or
1 ? H
source
inductance
V source
C IN
4x47 ? F
ceramic
capacitor
Y-Series
DC-DC
Converter
1 ? F
ceramic
capacitor
C O
100 ? F
ceramic
capacitor
Vout
(ii) The maximum current rating of the converter
(10 A)
During normal operation, derating curves with
maximum FET temperature less than or equal to
110 °C should not be exceeded. Temperature on the
PCB at the thermocouple location shown in Fig. D
should not exceed 110 °C in order to operate inside
the derating curves.
Efficiency
Figure x.3 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.4 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.
Fig. E: Test Setup for measuring input reflected-ripple
currents, i s and output voltage ripple.
MCD10196 Rev. 1.0, 21-Jun-10
Page 8 of 27
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