QHS Series – Quarter-Brick DC/DC Converter
48V Input
Data Sheet
12V, 5V, 3.3V, 2.5V, 1.8V, 1.5V, 1.2V Output
Features
•
•
Low profile – 12.7 mm height
Input/output isolation: 1500VDC, basic
insulation
•
•
•
•
•
•
•
•
•
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
Remote on/off (primary referenced), positive
or negative logic
Applications
• Distributed power architectures
• Telecommunications equipment
• LAN/WAN applications
•
•
Output voltage trim adjust
UL 1950 Recognition, CSA 22.2 No. 950-95
certification, TUV IEC950
• Data processing applications
Description
The QHS is a series of high efficiency, high-density, single output DC/DC converters for on-board 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
metalic substrate PCB provides superior thermal management for power components resulting in enhanced
product reliability. A heatsink can be conveniently and effectively attached to the IMS base plate for
operations in elevated ambient conditions or where airflow is minimal.
Selection Chart
Model
Input
Voltage
VDC
Input
Current,
Max
Output
Voltage
Vout,
Output Rated
Output
Ripple/Noise,
mV p-p
Typical
Efficiency
Current
I rated,
ADC
12
@ I rated,
%
ADC
VDC
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
150
150
150
100
100
100
100
91
92
89
88
85
79
76
25
40
40
40
50
50
REV. AUG 28, 2002
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