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YNC12S20 DC-DC Converter Data Sheet
9.6-14 VDC Input; 0.7525-5.5 VDC Programmable @ 20 A
recommends
the
use of
AWG
#40
gauge
thermocouples to ensure measurement accuracy.
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
Careful routing of the thermocouple leads will
further minimize measurement error. Refer to Fig.
E for optimum measuring thermocouple location.
Thermal Derating
Load current vs. ambient temperature and airflow
rates are given in Figs. x.1 for maximum
mounting,
efficiency,
start-up
and shutdown
temperature of 120 °C. Ambient temperature was
parameters, output ripple and noise, transient
response to load step-change, overload, and short
circuit.
The figures are numbered as Fig. x.y, where x
indicates the different output voltages, and y
associates with specific plots (y = 1 for the vertical
thermal dera ting, …). For example, Fig. x.1 will
refer to the vertical thermal derating for all the
output voltages in general.
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
The following pages contain specific plots or
temperature (120°C)
as
indicated
by
the
waveforms
associated
with
the
converter.
thermographic image, or
Additional comments for specific data are provided
below.
Test Conditions
All thermal and efficiency 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,
comprising 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
(ii) The maximum current rating of the converter
(20 A)
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. E should not exceed 120 °C in order to
operate inside the derating curves.
minimized. This provides
a worst-case
but
consistent scenario for thermal derating purposes.
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
Fig. E: Location of the thermocouple for thermal testing.
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,
check
actual
operating
temperatures
in
the
12 V, and 14 V.
application. Thermographic imaging is preferable;
if this capability is
not
available,
then
thermocouples
may
be
used.
Power-One
ZD-02137 Rev. 2.1 21-Jun-10
Page 8 of 28
www.power-one.com
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