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QMS DC-DC Series Data Sheet
Wide-Range Input, 70 to 82W Quarter-Brick Converters
Features
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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
Applications
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Output overvoltage protection
Input undervoltage lockout
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Wireless base stations
Telecommunications equipment
LAN/WAN
Data processing
Industrial applications
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Overtemperature protection
Approved to UL 60950-1/ CAN/CSA-C22.2 No.
60950-1, and TUV approved to EN 60950-1, IEC
60950-1
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
ADC
mV P-P
Model
QMS25DE
QMS14DG
QMS07DH
Input
Voltage
VDC
18 - 60
18 - 60
18 - 60
Input
Current, Max
1
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,
2
50
50
120
Typical
Efficiency @
I RATED & 36V IN
90%
92%
92%
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 are not recommended for new designs.
MCD10143 Rev.1.1, 30--Aug-10
Page 1 of 20
www.power-one.com
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