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YS05S10 DC-DC Converter Data Sheet
3.0-5.5 VDC Input; 0.7525-3.63 VDC Programmable @ 10 A
All measurements requiring airflow were made in the
vertical and horizontal wind tunnels 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 thermocouple
is recommended to ensure measurement accuracy.
Careful routing of the thermocouple leads will further
minimize measurement error. Refer to Fig. D for the
optimum measuring thermocouple location.
Fig. D: Location of the thermocouple for thermal testing.
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.
Efficiency
Fig. 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 4.5 V, 5.0 V
and 5.5 V. Fig. x.4 is for input voltages of 3.0 V,
3.3 V and 3.6 V and output voltages ≤ 2.5 V.
Power Dissipation
Fig. 3.3V.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
4.5 V, 5.0 V and 5.5 V for 3.3 V output.
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
Thermal Derating
Load current vs. ambient temperature and airflow
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
rates are given in Figs. x.1 and Figs. x.2 for
maximum temperature of 120°C. Ambient
temperature was varied between 25 °C and 85 °C,
with airflow rates from 30 to 500 LFM (0.15 m/s to
2.5 m/s), and vertical and horizontal mountings. 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 is defined as the lowest of:
(i) The output current at which any MOSFET
temperature does not exceed a maximum specified
temperature (120°C) as indicated by the
thermographic image, or
(ii) The maximum current rating of the converter
(10 A).
During normal operation, derating curves with
maximum FET temperature less than or equal to
Fig. E: Test setup for measuring input reflected-ripple
currents, i s and output voltage ripple.
MCD10204 Rev. 1.0, 24-Jun-10
Page 8 of 30
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