JUN 09, 2003 revised to NOV 20, 2006 Page 1 of 14 www.power-one.com
Q48T30025 DC-DC Converter Data Sheet
3
-75 VDC In
ut; 2.5 VDC
30A O
t
ut
The Q48T30025 through-hole mounted 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.
In telecommunications applications the
Q
&&
Family 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 heat sinks 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.
Ambient Temperature [°C]
20 30 40 50 60 70 80 90
Load Current [Adc]
0
5
10
15
20
25
30
35
500 LFM (2.5 m/s)
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)
Fig. 1: Available load current vs. ambient air temperature and air-
flow rates for Q48T30025 converter mounted vertically with air flow-
ing from pin 3 to pin 1, MOSFET temperature ≤ 120°C, Vin = 54 V.
Applications
• Telecommunications
• Data communications
• Wireless
• Servers
Q48T30025 Converter
Features
• 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 30 A half brick converters
• High efficiency: 86.5% @ 30 A, 87.5% @ 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%/-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
• Meets conducted emissions requirements of FCC
Class B and EN55022 Class B with external filter
• All materials meet UL94, V-0 flammability rating
