Q48T20050 and Q48S20050
Data Sheet
36-75 Vdc Input, 20 A, 5.0 Vdc Output
The Q48T20050 through-hole and Q48S20050 surface
mounted DC/DC converters offer unprecedented perform-
ance in the industry-standard quarter brick format. This is
accomplished through the use of patent pending circuit and
packaging techniques to achieve ultra-high efficiency, excel-
lent thermal performance and a very low body profile.
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In telecommunications applications theQFamily 20 A con-
verters provide thermal performance that exceeds competing
quarter bricks with a higher nominal rating. Low body profile
and the preclusion of heatsinks minimize airflow shadowing,
thus enhancing cooling for downstream devices. The use of
100% surface-mount technologies for assembly, coupled
with di/dt’s advanced electric and thermal circuitry and pack-
aging, results in a product with extremely high quality and
reliability.
Q48T20050 and Q48S20050 Converters
Features
25
20
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Delivers up to 20 A
High efficiency: 86% @ 20 A, 88% @ 10 A
Starts-up into pre-biased output
No minimum load required
15
No heatsink required
Lowest profile in industry: 0.28” [7.2 mm] TH ver-
sion, 0.26” [6.6 mm] SMT version
Lowest weight in industry: 1 oz [28 g] typical
Industry-standard footprint: 1.45” x 2.30”
Industry-standard pinout (TH version)
Meets Basic Insulation Requirements of EN60950
Withstands 100 V input transient for 100 ms
On-board LC input filter
500 LFM (2.5 m/s)
10
5
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
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20
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Fixed frequency operation
Fig. 1: Available load current vs. ambient air temperature and air-
flow rates for Q48T20050 converter with D height pins mounted
vertically with air flowing from pin 3 to pin 1, MOSFET temperature
≤ 120°C, Vin = 48 V.
Fully protected
Remote output sense
Output voltage trim range: +10%/-20%
Trim resistor via industry-standard equations
High reliability: MTBF 2.6 million hours, calculated per
Telcordia TR-332, Method I Case 1
Positive or negative logic ON/OFF option
UL 60950 recognized in U.S. & Canada, and DEMKO
certified per IEC/EN 60950
Applications
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Telecommunications
Datacommunications
Wireless
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Meets conducted emissions requirements of FCC
Class B and EN55022 Class B with external filter
All materials meet UL94, V-0 flammability rating
Servers
Q48x20050 FDS Ver 3 11-07-03
USA Toll Free 866 WOW-didt
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