Q48T20050 and Q48S20050 DC-DC Converter Data Sheet
36-75 VDC Input; 5.0 VDC @ 20A 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.
&&
In telecommunications applications the Q Family 20 A con-
verters provide thermal performance that exceeds competing
quarter bricks with a higher nominal rating. 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
Q48T20050 and Q48S20050 Converters
with Power-Ones advanced electric and thermal circuitry
and packaging, results in a product with extremely high qual-
ity and reliability.
Features
25
RoHS lead-free solder and lead-solder-exempted
products are available
20
Delivers up to 20 A
High efficiency: 86% @ 20 A, 88% @ 10 A
15
Start-up into pre-biased output
No minimum load required
500 LFM (2.5 m/s)
No heat sink required
10
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
Low profile: 0.28 [7.2 mm] TH version, 0.26 [6.6 mm]
200 LFM (1.0 m/s)
SMT version
100 LFM (0.5 m/s)
5
30 LFM (0.15 m/s)
Low weight: 1 oz [28 g] typical
Industry-standard footprint: 1.45 x 2.30
0
Industry-standard pinout (TH version)
20 30 40 50 60 70 80 90
Meets Basic Insulation Requirements of EN60950
Ambient Temperature [C]
Withstands 100 V input transient for 100 ms
Fig. 1: Available load current vs. ambient air temperature and air-
On-board LC input filter
flow rates for Q48T20050 converter with D height pins mounted
Fixed-frequency operation
vertically with air flowing from pin 3 to pin 1, MOSFET temperature
Fully protected
120C, Vin = 48 V.
Remote output sense
Output voltage trim range: +10%/-20%
Trim resistor via industry-standard equations
Applications
High reliability: MTBF 2.6 million hours, calculated per
Telcordia TR-332, Method I Case 1
Telecommunications
Positive or negative logic ON/OFF option
Data communications
UL 60950 recognized in U.S. & Canada, and DEMKO
Wireless
certified per IEC/EN 60950
Servers
Meets conducted emissions requirements of FCC
Class B and EN55022 Class B with external filter
All materials meet UL94, V-0 flammability rating
NOV 07, 2003 revised to NOV 20, 2006 Page 1 of 15 www.power-one.com
Load Current [Adc]
Q48T20050 and Q48S20050 DC-DC Converter Data Sheet
36-75 VDC Input; 5.0 VDC @ 20A Output
Electrical Specifications
Conditions: T =25C, Airflow=300 LFM (1.5 m/s), Vin=48 Vdc, unless otherwise specified.
A
PARAMETER NOTES MIN TYP MAX UNITS
ABSOLUTE MAXIMUM RATINGS
Input Voltage Continuous 0 80 Vdc
Operating Ambient Temperature -40 85 C
Storage Temperature -55 125 C
INPUT CHARACTERISTICS
Operating Input Voltage Range 36 48 75 Vdc
Input Under Voltage Lockout Non-latching
Turn-on Threshold 33 34 35 Vdc
Turn-off Threshold 31 32 33 Vdc
Input Voltage Transient 100 ms 100 Vdc
OUTPUT CHARACTERISTICS
External Load Capacitance Plus full load (resistive) 10,000 F
Output Current Range 0 20 Adc
Current Limit Inception Non-latching 21 23.5 26 Adc
Peak Short-Circuit Current Non-latching. Short=10m . 30 45 A
RMS Short-Circuit Current Non-latching 6.7 Arms
ISOLATION CHARACTERISTICS
I/O Isolation 2000 Vdc
Isolation Capacitance 200 F
Isolation Resistance 10 M
FEATURE CHARACTERISTICS
Switching Frequency 415 kHz
1
Output Voltage Trim Range Use trim equations on Page 7 -20 +10 %
1
Remote Sense Compensation Percent of V (NOM) +10 %
OUT
Output Over-Voltage Protection Non-latching 117 122 127 %
Over-Temperature Shutdown (PCB) Non-latching 125 C
Auto-Restart Period Applies to all protection features 100 ms
Turn-On Time 3 ms
ON/OFF Control (Positive Logic)
Converter Off -20 0.8 Vdc
Converter On 2.4 20 Vdc
ON/OFF Control (Negative Logic)
Converter Off 2.4 20 Vdc
Converter On -20 0.8 Vdc
Additional Notes:
1. Vout can be increased up to 10% via the sense leads or up to 10% via the trim function, however total output voltage trim from all sources
should not exceed 10% of V (NOM), in order to insure specified operation of over-voltage protection circuitry. See further discussion at end of
OUT
Output Voltage Adjust /TRIM section.
NOV 07, 2003 revised to NOV 20, 2006 Page 2 of 15 www.power-one.com