QL48T30012 DC-DC Converter Data Sheet
36-75 VDC Input; 1.2 VDC @ 30A Output
The QL48T30012 through-hole mounted low output voltage
DC-DC converter offers unprecedented performance 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, excellent thermal
performance and a very low body profile.
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In telecommunications applications theQFamily 30 A con-
verters provide thermal performance that far exceeds all
quarter bricks and is comparable even to existing half-bricks.
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 Power-One’s advanced electric and
thermal circuitry and packaging, results in a product with ex-
tremely high quality and reliability.
QL48T30012 Converter
Features
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RoHS lead-free solder and lead-solder-exempted
products are available
Delivers up to 30 A
Higher current capability at 70ºC than existing quarter
brick and half-brick converters
High efficiency: 81% @ 30 A, 83% @ 15 A
Starts-up into pre-biased output
No minimum load required
No heat sink required
Low profile: 0.28” [7.2 mm]
Low weight: 1 oz [28 g] typical
Industry-standard footprint: 1.45” x 2.30”
Industry-standard pinout
Meets Basic Insulation Requirements of EN60950
Withstands 100 V input transient for 100 ms
On-board LC input filter
Fixed-frequency operation
Fully protected
Remote output sense
Output voltage trim range: ±10%
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
Meets conducted emissions requirements of FCC
Class B and EN55022 Class B with external filter
All materials meet UL94, V-0 flammability rating
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500 LFM (2.5 m/s)
15
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
10
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
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Ambient Temperature [°C]
Fig. 1: Available load current vs. ambient air temperature and air-
flow rates for QL48T30012 converter mounted vertically with air
flowing from pin 3 to pin 1, MOSFET temperature ≤ 120°C, Vin =
54 V.
Applications
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Telecommunications
Datacommunications
Wireless
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Servers
MAR 26, 2003 revised to NOV 13, 2006
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