QMS DC-DC Series Data Sheet
Wide-Range Input, 70 to 82W Quarter-Brick Converters
Features
RoHS lead free solder and lead solder exempted
products are available
Ultra-wide input range: 18 to 60 VDC
Cost-effective, single board construction
High efficiency
Low profile
Input-to-output isolation: 1500 VDC
Basic Insulation
Start-up into high capacitive load
Low conducted and radiated EMI
Output overcurrent protection
Output overvoltage protection
Input undervoltage lockout
Overtemperature protection
Approved to UL 60950-1/ CAN/CSA-C22.2 No.
60950-1, and TUV approved to EN 60950-1, IEC
60950-1
Applications
Wireless base stations
Telecommunications equipment
LAN/WAN
Data processing
Industrial applications
Description
The QMS Series of converters provide a single, isolated step-down voltage (3.3, 5 or 12 VDC nominal) from a
wide-input voltage range (18 – 60 VDC). The QMS is an excellent choice in applications where multiple input
voltage options are required. The designer can use a single QMS converter to cover both 24Vin and 48Vin input
ranges, eliminating the need to specify multiple circuit packs to handle each input range. This is particularly useful
in wireless base station applications where the power plants tend to vary and could provide nominal 24 or 48 V
input.
The QMS converters are highly efficient over the entire wide-input voltage range, cost-effective, and offer a low
profile, industry-standard quarter-brick footprint. The standard feature set includes remote on/off, remote output
voltage sensing, industry-standard output trim, input undervoltage lockout, and overtemperature shutdown with
hysteresis.
Model Selection
Model
Input
Voltage
VDC
18 - 60
18 - 60
18 - 60
Input
Current, Max
1
ADC
6.0
4.3
5.0
Output
Voltage
VDC
3.3
5.0
12.0
Output Rated
Current, I
RATED
ADC
25
14
6.75
Output
Ripple/Noise,
mV
P-P
50
50
120
2
Typical
Efficiency @
I
RATED
& 36V
IN
90%
92%
92%
QMS25DE
QMS14DG
QMS07DH
This product is intended for integration into end-use equipment. All the required procedures for CE marking of end-use equipment should be
followed.
1
2
@ V
IN
minimum.
Nominal, (DC to 500 kHz)
Model numbers highlighted in yellow or shaded are not recommended for new designs.
MCD10143 Rev.1.0, 27-Jan-10
Page 1 of 20
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QMS DC-DC Series Data Sheet
Wide-Range Input, 70 to 82W Quarter-Brick Converters
Absolute Maximum Ratings
Stresses in excess of the absolute maximum ratings may cause performance degradation, adversely effect
long-term reliability, and cause permanent damage to the converter.
Parameter
Input Voltage
Operating Temperature
Storage Temperature
ON/OFF Control Voltage
Output Power
1
1
2
Conditions/Description
Continuous
Transient Withstand (100 ms)
Hot Spot Monitor Location (Tc)
Ambient
Ambient
Referenced to -Vin
QMS25DE
QMS14DG
QMS07DH
2
Min
0
-40
-40
-40
-0.7
Max
60
100
125
85
125
20
82.5
70
81
Units
VDC
VDC
C
C
C
VDC
W
W
W
With appropriate power derating, see Figures 37 – 42.
See temperature probe location T
C
, Figure 36. [Ref.V09 case]
Environmental and Mechanical Specifications
All specifications apply over specified input voltage, output load, and temperature range, unless otherwise noted.
Parameter
Operating Humidity
Storage Humidity
Shock
Sinusoidal Vibration
Weight
Water Washing
MTBF (Calculated)
Dimensions
Markings & Labeling
Conditions/Description
Relative Humidity, Non-cond.
Relative Humidity, Non-cond.
(Half-sinewave, 6 ms), 3 axes
GR-63-CORE, Section 5.4.2
Standard process
Per Telcordia SR-332 Issue 1,
(method 1, case 2, GB, 40
O
C)
(Overall)
50
1
1.2/35
Yes
1,750
2.28 (57.9) x 1.45 (36.8)
x 0.43 (11)
Min
Nom
Max
95
95
Units
%
%
g
g
Oz/g
kHrs
In.
(mm)
Includes P/N, Logo, Date Code, Country of Manufacture
Isolation Specifications
All specifications apply over specified input voltage, output load, and temperature range, unless otherwise noted.
Parameter
Insulation Safety Rating
Isolation Voltage
Isolation Resistance
Isolation Capacitance
Conditions/Description
Input to Output
Input to Output
Input to Output
Min
1500
10
4700
Nom
Basic
Max
Units
VDC
M
Ω
pF
MCD10143 Rev.1.0, 27-Jan-10
Page 2 of 20
www.power-one.com
QMS DC-DC Series Data Sheet
Wide-Range Input, 70 to 82W Quarter-Brick Converters
EMI & Safety Regulatory Compliance
Safety Agency
UL
TUV product service
CB report
Declaration of Conformity
Conducted Emissions
1
1
Standard Approved To:
UL60950-1 / CSA C22.2 No. 60950-1-03
TUV EN60950-1/A11:2004
IEC60950-1:2001
DIR 73/23/EEC Low Voltage Directive
(with external EMI filter)
Marking
cURus
TUV PS Baurt mark
N/A
CE
CISPR 22 class A
See figures 43, 44, 45.
Input Specifications
All specifications apply over specified input voltage, output load, and temperature range, unless otherwise noted.
Parameter
Input Voltage
Turn-On Input Voltage (UVLO)
Turn-Off Input Voltage
Turn-Off Hysteresis
Input Reflected Ripple Current
No-load Input Current
No-load Power Dissipation
@ I
RATED
, 12µH source inductance
2
BW=20MHz
18VDC < Vin < 60VDCc
Vin = 36VDC
25
100
0.1
1
1
Conditions/Description
Continuous
Ramping Up
Ramping Down
Min
18
16
13
2
Nom
17
15
10
90
Max
60
18
16.5
72
150
5
50
1.4
Units
VDC
VDC
VDC
VDC
mA
P-P
mA
W
mA
µF
µF
A
2
s
1
Disabled Input Current
18VDC < Vin < 60VDC
Input Capacitance (internal)
Minimum Input Capacitance
(ESR <0.7
Ω)
(external)
Inrush Transient
2
see Figure 2
Vin = 36Vin, see Figures 1 and 47
MCD10143 Rev.1.0, 27-Jan-10
Page 3 of 20
www.power-one.com
QMS DC-DC Series Data Sheet
Wide-Range Input, 70 to 82W Quarter-Brick Converters
Output Specifications
All specifications apply over specified input voltage, output load, and @ 40
O
C ambient temperature, unless
otherwise noted.
QMS25DE: 3.3V / 25A
Parameter
Output Voltage
(Set-point)
Line Regulation
Load Regulation
Temperature Coefficient
Total Error Band
Output Power
Output Current
1
1
Conditions/Description
Vin = 36V, Io =25A
Vi =18V to 60V, Io =50% Io.max
Vin =36V, Io.min to Io.max
-40
C
< T
AMB
< +85
C
(Line, Load, Temperature,
Ripple, Life)
w/ proper thermal derating
w/ proper thermal derating
Vin = 36 V, Vo < 90%Vonom
Over line and load,
-40
C
< T
AMB
< +85
C
(DC to 20 MHz)
75-100-75% load step change,
to 1% error band, Co=0 µF
Slew = 1.0A/s >>>
Slew = 0.1A/s >>>
Vin
NOM
, I
O
=
I
RATED
Overall input voltage, load,
and temperature conditions
5
Min
3.25
Nom
3.30
Max
3.35
10
0.3
25
0.75
0.02
Units
VDC
mV
%
mV
%
%/C
VDC
%
W
A
%Iomax
mV
P-P
%
mV
RMS
mV
s
mV
s
%
%Vout
ms
ms
ms
F
kHz
3.12
3.48
+/- 5.5
82.5
0
125
50
1.5
17
25
150
100
3.0
35
Output Current Limit Threshold
2
Output Ripple
3
Dynamic Regulation
Peak Deviation
Settling Time
Peak Deviation
Settling Time
Efficiency
4
+/-165
500
+/-165
500
90
5
2
10
50
1
330
300
+/-330
1,000
+/-330
1,000
10
150
250
2
8,220
(T
AMB
=40C)
5
Turn-on Overshoot
Turn-On Time
Turn-On Time
f
(VIN)
Time from Vin=UVLO to
90% of Vout
NOM
6
f
(On/Off)
5
Time from enable to
90% of Vout
NOM
From 10 to 90% of Vout
NOM
7
Rise Time
Admissible Load Capacitance
Switching Frequency
I
rated
, Nom Vin
Notes:
1
see Figures 37 and 40
2
see Figure 18 for ripple waveform and Figure 46 for measurement method.
3
see Figures 12 and 15
4
see Figure 3
5
see Figure 6
6
see Figure 9
7
A minimum 330
µ
F (AVX, TPSD337K006R0045) is recommended for operation over full load, line and temperature range.
MCD10143 Rev.1.0, 27-Jan-10
Page 4 of 20
www.power-one.com
QMS DC-DC Series Data Sheet
Wide-Range Input, 70 to 82W Quarter-Brick Converters
Output Specifications (Cont’d)
All specifications apply over specified input voltage, output load, and @ 40
O
C ambient temperature, unless
otherwise noted.
QMS14DG: 5V / 14A
Parameter
Output Voltage
(Set-point)
Line Regulation
Load Regulation
Temperature Coefficient
Total Error Band
Output Power
Output Current
1
1
Conditions/Description
Vi = 36 V, Io =14 A
Vi =18 V to 60 V, Io =50% Io.max
Vi =36V, Io.min to Io.max
-40
C
< T
AMB
< +85
C
(Line, Load, Temperature,
Ripple, Life)
w/ proper thermal derating
w/ proper thermal derating
Vin = 36 V, Vo < 90%Vonom
Over line and load,
-40
C
< T
AMB
< +85
C
(DC to 20 MHz)
75-100-75% load step change,
to 1% error band, Co=0 µF
Slew = 1.0A/s >>>
Slew = 0.1A/s >>>
Vin
NOM
, I
O
=
I
RATED
Overall input voltage, load,
and temperature conditions
5
Min
4.925
Nom
5.0
Max
5.075
15
0.3
25
0.5
0.02
Units
VDC
mV
%
mV
%
%/C
VDC
%
W
A
%Iomax
mV
P-P
%
mVrms
4.76
5.24
+/- 4.8
70
0
120
50
1.0
17
14
160
120
2.4
42
Output Current Limit Threshold
2
Output Ripple
1
Dynamic Regulation
Peak Deviation
Settling Time
Peak Deviation
Settling Time
Efficiency
4
+/-250
500
+/-250
500
92
5
2
10
50
3
220
330
+/-500
1,000
+/-500
1,000
10
150
250
6
4,600
mV
s
mV
s
%
%Vout
ms
ms
ms
F
kHz
(T
AMB
=40C)
5
Turn-on Overshoot
Turn-On Time
Turn-On Time
f
(VIN)
Time from Vin=UVLO to
90% of Vout
NOM
6
f
(On/Off)
5
Time from enable to
90% of Vout
NOM
From 10 to 90% of Vout
NOM
7
Rise Time
Admissible Load Capacitance
Switching Frequency
I
RATED
, Nom Vin
Notes:
1
see Figures 38 and 41
2
see Figure 19 for ripple waveform and Figure 46 for measurement method.
3
see Figures 13 and 16
4
see Figure 4
5
see Figure 7
6
see Figure 10
7
A minimum 220
µ
F (AVX, TPSD227K010R0050) is recommended for operation over full load, line and temperature range.
MCD10143 Rev.1.0, 27-Jan-10
Page 5 of 20
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