QM48T/S25050 DC-DC Converter Data Sheet
36-75 VDC Input; 5 VDC @ 25 A Quarter-Brick
The QM Series of high current single output dc-dc
converters sets new standards for thermal performance
and power density in the quarter-brick package.
The QM48T/S25050 converters of the QM Series provide
thermal performance in high temperature environments
that is comparable to or exceeds the industrys leading 5 V
half-bricks. This is accomplished through the use of patent
pending circuit, packaging and processing techniques to
achieve ultra-high efficiency, excellent thermal
management, and a very low body profile.
Low body profile and the preclusion of heat sinks minimize
impedance to system airflow, thus enhancing cooling for
both upstream and downstream devices. The use of 100%
automation for assembly, coupled with advanced electric
and thermal design, results in a product with extremely
Features
high reliability.
RoHS lead-free solder and lead-solder-exempted
products are available
Operating from a 36-75 V input, the QM Series converters
provide outputs that can be trimmed from 20% to +10% Delivers up to 25 A @ 5.0 V
of the nominal output voltage, thus providing outstanding Industry-standard quarter brick pinout
design flexibility.
On-board input differential LC-filter
High efficiency no heat sink required
Start-up into pre-biased output
No minimum load required
Available in through-hole and surface-mount packages
Low profile: 0.28 [7.1 mm] SMT version,
Applications
0.31 [7.9 mm] TH version
Low weight: 1.1 oz [31.5 g] typical
Telecommunications
Meets Basic Insulation requirements of EN60950
Data communications
Withstands 100 V input transient for 100 ms
Wireless Fixed-frequency operation
Fully protected
Servers
Remote output sense
Output voltage trim range: +10%/20% with
industry-standard trim equations
High reliability: MTBF of 2.6 million hours,
calculated per Telcordia TR-332, Method I Case 1
Positive or negative logic ON/OFF option
UL60950 recognized in US and Canada and
DEMKO certified per IEC/EN60950
Meets conducted emissions requirements of FCC
Class B and EN 55022 Class B with external filter
All materials meet UL94, V-0 flammability rating
V4.0 29-March-11 Page 1 of 13 www.power-one.com
QM48T/S25050 DC-DC Converter Data Sheet
36-75 VDC Input; 5 VDC @ 25 A Quarter-Brick
Electrical Specifications (QM48T25050 and QM48S25050)
Conditions: T = 25 C, 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 Turn-on Threshold Non-latching 33 34 35 VDC
Input Under Voltage Lockout Turn-off Threshold 31 32 33 VDC
Input Voltage Transient 100 ms 100 VDC
Maximum Input Current 25 ADC, 5 VDC Out @ 36 VDC In 3.9 ADC
Input Stand-by Current Vin = 48 V, converter disabled 2.65 mADC
Input No Load Current (0 load on the output) Vin = 48 V, converter enabled 52 mADC
Input Reflected-Ripple Current 25 MHz bandwidth 12.5 mA
PK-PK
Input Voltage Ripple Rejection 120 Hz TBD dB
OUTPUT CHARACTERISTICS
External Load Capacitance Plus full load (resistive) 10,000 F
Output Current Range 0 25 ADC
Current Limit Inception Non-latching 26.25 30 33 ADC
Peak Short-Circuit Current Non-latching. Short = 10 m. 31 50 A
RMS Short-Circuit Current Non-latching 6.5 Arms
Output Voltage Set Point (no load) 4.950 5.000 5.050 VDC
Output Regulation Over Line 2 5 mV
Output Regulation Over Load 2 5 mV
2
Output Voltage Range Over line, load and temperature 4.925 5.075 VDC
Output Ripple and Noise - 25 MHz bandwidth Full load + 10 F tantalum + 1 F ceramic 30 50 mV
PK-PK
ISOLATION CHARACTERISTICS
I/O Isolation 2000 VDC
Isolation Capacitance 1.4 nF
Isolation Resistance 10 M
FEATURE CHARACTERISTICS
Switching Frequency 340 kHz
1
Output Voltage Trim Range Industry-std. equations -20 +10 %
1
Remote Sense Compensation Percent of V (NOM) +10 %
OUT
Output Over-Voltage Protection Non-latching 117 128 140 %
Auto-Restart Period Applies to all protection features 100 ms
Turn-On Time 4 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
DYNAMIC RESPONSE
Load Change 25% of Iout Max, di/dt = 1 A/s Co = 470 F tantalum + 1 F ceramic 120 mV
Setting Time to 1% 40 s
EFFICIENCY
100% Load 89.5 %
50% Load 90.5 %
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.
OUT
2. -40C to 85C
V4.0 29-March-11 Page 2 of 13 www.power-one.com