YNM12S05-G POWER ONE, YNM12S05-G Datasheet - Page 7

• Manufacturer Part Number: YNM12S05-G
• Description: Module DC-DC 1-OUT 0.7525V to 5.5V 5A 28W 5-Pin SMD T/R
• Manufacturer: POWER ONE

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 derating, …). For example, Fig. x.1 will refer
to the vertical thermal derating for all the output
voltages in general.
The following pages contain specific plots or
waveforms associated with the converter. Additional
comments for specific data are provided below.
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 tunnels using Infrared
(IR)
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
Thermographic
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. C for the
optimum measuring thermocouple location.
Fig. C: Location of the thermocouple for thermal testing.
Thermal Derating
Load current vs. ambient temperature and airflow
rates are given in Figs. x.1 to x.2 for maximum
temperature of 120 °C. Ambient temperature was
MCD10192 Rev. 1.0, 21-Jun-10
thermography
temperatures
imaging
and
is
in
thermocouples
preferable;
9.6-14 VDC Input; 0.7525-5.5 VDC Programmable @ 5 A
the
application.
if
this
for
Page 7 of 24
YNM12S05 DC-DC Converter Data Sheet
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 input pins to output pins.
For each set of conditions, the maximum load
current is defined as the lowest of:
(i) The output current at which any MOSFET
temperature
specified temperature (120 °C) as indicated by the
thermographic image, or
(ii) The maximum current rating of the converter
(5 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. C
should not exceed 120 °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.
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 μF ceramic
capacitor.
The output voltage ripple and input reflected ripple
current waveforms are obtained using the test setup
shown in Fig. D.
Fig. D:
currents,
Vsource
inductance
source
1 H
i
S
i
s
Test Setup for measuring input reflected-ripple
and output voltage ripple.
www.power-one.com
capacitor
C
ceramic
47F
IN
does
GND
Vin
not
Converter
Y-Series
DC/DC
exceed
GND
Vout
capacitor
ceramic
1F
a
maximum
capacitor
ceramic
C
47F
O
Vout