QHS DC-DC Series Data Sheet
Features
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RoHS lead-solder-exempt compliant
Low profile – 12.7 mm height
Input/output isolation: 1500 VDC, Basic
insulation
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•
•
•
•
•
•
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High efficiency - up to 92% at full load
Start-up into high capacitive load
Low conducted and radiated EMI
Output overcurrent protection
Output overvoltage protection
Back drive protection
Overtemperature protection
Remote sense
Applications
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•
•
•
Distributed power architectures
Remote on/off (primary referenced), positive or
negative logic
Telecommunications equipment
LAN/WAN
•
•
Output voltage trim adjust
Data processing
UL1950 recognition, CSA 22.2 No. 950-95
certification, TUV IEC950
Description
The QHS is a series of high efficiency, high-density, single output dc-dc converters for onboard conversion of
standard telecom and datacom input voltages into isolated low voltage outputs in a through-hole mounting
package. The two-board construction provides a cool environment for control components and the integrated
metallic substrate PCB provides superior thermal management for power components resulting in enhanced
product reliability. A heat sink can be conveniently and effectively attached to the IMS base plate for operations in
elevated ambient conditions or where airflow is minimal.
Model Selection
Model
Input
Voltage
VDC
Input
Current, Max
ADC
Output
Voltage
Vout,
Output Rated
Current
I rated,
Output
Ripple/Noise,
mV p-p
Typical
Efficiency @
I rated,
%
VDC
ADC
QHS12ZH
QHS25ZG
QHS40ZE
QHS40ZD
QHS40ZB
QHS50ZA
QHS50ZY
36-75
36-75
36-75
36-75
36-75
36-75
36-75
4.5
4.3
4.5
3.3
2.5
2.7
2.3
12.0
5.0
3.3
2.5
1.8
1.5
1.2
12
25
40
40
40
50
50
150
150
150
100
100
100
100
91
92
89
88
85
79
76
Model numbers highlighted in yellow or shaded are not recommended for new designs.
DEC 09, 2004 revised to APR 12, 2006
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