Datasheet > QM48T50012-PDBPG

QM48T50012-PDBPG

更新时间： 2023-06-15 00:00:00

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DC-DC Regulated Power Supply Module, 1 Output, 60W, Hybrid, ROHS COMPLIANT, QUARTER BRICK PACKAGE-8

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QM48T50012-PDBPG 数据手册

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QM48T50012 DC-DC Converter Data Sheet

36-75 VDC Input; 1.2 VDC @ 50A Output

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 pur-

poses.

All measurements requiring airflow were made in Power-

One’s vertical and horizontal wind tunnel facilities using In-

frared (IR) thermography and thermocouples for thermome-

try.

Ensuring components on the converter do not exceed their

ratings is important to maintaining high reliability. If one an-

ticipates 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. Thermo-

graphic imaging is preferable; if this capability is not avail-

able, then thermocouples may be used. Power-One recom-

mends the use of AWG #40 gauge thermocouples to ensure

measurement accuracy. Careful routing of the thermocouple

leads will further minimize measurement error. Refer to Fig-

ure H for optimum measuring thermocouple location.

Fig. H: Location of the thermocouple for thermal testing.

Efficiency

Fig. 3 shows the efficiency vs. load current plot for ambient

temperature of 25ºC, airflow rate of 300 LFM (1.5 m/s) with

vertical mounting and input voltages of 36 V, 48 V and 72 V.

Power Dissipation

Fig. 4 shows the power dissipation vs. load current plot for

Ta = 25ºC, airflow rate of 300 LFM (1.5 m/s) with vertical

mounting and input voltages of 36 V, 48 V and 72 V.

Thermal Derating

Load current vs. ambient temperature and airflow rates are

given in Fig. 1 and Fig. 2 for vertical and horizontal converter

mounting. Ambient temperature was varied between 25°C

and 85°C, with airflow rates from 30 to 500 LFM (0.15 to 2.5

m/s).

Start-up

Output voltage waveforms, during the turn-on transient using

the ON/OFF pin for full rated load currents (resistive load)

are shown without and with external load capacitance in

Fig. 5 and Fig. 6, respectively.

For each set of conditions, the maximum load current was

defined as the lowest of:

Ripple and Noise

(i) The output current at which any FET junction temperature

does not exceed a maximum specified temperature (120°C)

as indicated by the thermographic image, or

Fig. 8 shows the output voltage ripple waveform, measured

at full rated load current with a 10 µF tantalum and 1 µF ce-

ramic capacitor across the output. Note that all output volt-

age waveforms are measured across a 1 µF ceramic capaci-

tor.

(ii) The nominal rating of the converter (50 A).

During normal operation, derating curves with maximum FET

temperature less or equal to 120°C should not be exceeded.

Temperature on the PCB at the thermocouple location

shown in Fig. H should not exceed 118°C in order to operate

inside the derating curves.

The input reflected ripple current waveforms are obtained

using the test setup shown in Fig 9. The corresponding

waveforms are shown in Fig. 10 and Fig. 11.

MAY 14, 2004 revised to NOV 03, 2006

Page 7 of 13

www.power-one.com

1...4 5 678 9 10...13

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