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YNV05T06 DC-DC Converter Data Sheet
3.0-5.5 VDC Input; 0.7525-3.63 VDC Programmable @ 6A
thermocouples to ensure measurement accuracy.
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 to 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 (0.15m/s to 2.5 m/s), for Vin =
5V and Vin = 3.3V, and vertical or horizontal
converter mounting.
For each set of conditions, the maximum load
current was defined as the lowest of:
Power Dissipation
Fig. 3.3V.4 shows the power dissipation vs. load
current plot for Ta = 25oC, airflow rate of 200 LFM
(1 m/s) with vertically or horizontally mounting and
input voltages of 4.5V, 5.0V and 5.5V for 3.3V
output voltage.
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. F.
Nex -v Series
(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
(6A)
i S
1 ? H
source
inductance
V source
C IN
4 x 47 ? F
ceramic
capacitor
Vin Vout
GND GND
TM
DC/DC
Converter
1 ? F
ceramic
capacitor
C O
47 ? 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 locations shown in
Fig. E should not exceed 120°C in order to
operate inside the derating curves.
Fig. E: Location of the thermocouple for thermal testing.
Efficiency
Fig. x.3 show the efficiency vs. load current plot for
ambient temperature of 25oC, airflow rate of 200
LFM (1 m/s) with vertically or horizontally mounting
and input voltages of 4.5V, 5.0V and 5.5V.
Fig. x.4 show the efficiency vs. load current plot for
ambient temperature of 25oC, airflow rate of 200
LFM (1 m/s) with vertically or horizontally mounting
and input voltages of 3.0V, 3.3V, and 3.6V for
output voltages ? 2.5V.
Fig. F: Test setup for measuring input reflected ripple
currents, i s and output voltage ripple.
MCD10197 Rev. 1.0, 21-Jun-10
Page 8 of 25
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