QHS DC-DC Series Data Sheet
Features
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RoHS lead solder exemption compliant
Low profile – 12.7 mm height
Input/output isolation: 1500 VDC, 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
Output voltage trim adjust
UL1950 recognition, CSA 22.2 No. 950-95
certification, TUV IEC950
Applications
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Distributed power architectures
Telecommunications equipment
LAN/WAN
Data processing
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
36-75
36-75
36-75
36-75
36-75
36-75
36-75
Input
Current, Max
ADC
4.5
4.3
4.5
3.3
2.5
2.7
2.3
Output
Voltage
Vout,
VDC
12.0
5.0
3.3
2.5
1.8
1.5
1.2
Output Rated
Current
I
rated,
ADC
12
25
40
40
40
50
50
Output
Ripple/Noise,
mV p-p
150
150
150
100
100
100
100
Typical
Efficiency @
I
rated,
%
91
92
89
88
85
79
76
QHS12ZH
QHS25ZG
QHS40ZE
QHS40ZD
QHS40ZB
QHS50ZA
QHS50ZY
Model numbers highlighted in yellow or shaded are not recommended for new designs.
MCD10047 Rev. 1.0
Page 1 of 10
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QHS DC-DC Series Data Sheet
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.
Table 1. Absolute Maximum Ratings
Parameter
Input voltage
Operating Temperature
Storage Temperature
ON/OFF Control Voltage
Conditions/Description
Continuous
Transient
Base Plate Temperature
Referenced to -Vin
Min
Max
75
80
100
125
20
Units
VDC
VDC
°C
°C
VDC
-40
-40
Environmental and Mechanical Specifications
All specifications apply over specified input voltage, output load, and temperature range, unless otherwise noted.
Table 2. Environmental and Mechanical Specifications
Parameter
Shock
Sinusoidal Vibration
Weight
Water Washing
MTBF
Conditions/Description
Halfsine wave, 3 axes
GR-63-Core, Section 5.4.2
Standard process
Per Bellcore TR-NWT-000332
Min
50
1
Nom
Max
Units
g
g
Oz/g
kHrs
1.2/35
Yes
1,980
MCD10047 Rev. 1.0
Page 2 of 10
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QHS DC-DC Series Data Sheet
Isolation Specifications
All specifications apply over specified input voltage, output load, and temperature range, unless otherwise noted.
Table 3. Isolation Specifications
Parameter
Insulation Safety Rating
Isolation Voltage
Isolation Voltage
Isolation Resistance
Isolation Capacitance
Conditions/Description
Input to output, input to base plate
Output to base plate
Min
1500
500
10
1000
Nom
Basic
Max
Units
VDC
VDC
MΩ
pF
Input Specifications
All specifications apply over specified input voltage, output load, and temperature range, unless otherwise noted.
Table 4. Input Specifications
Parameter
Input Voltage
Turn-On Input Voltage
Turn-Off Input Voltage
Input over voltage protection
Turn-On Time
Input Reflected Ripple Current
Conditions/Description
Continuous
Ramping Up
Ramping Down
Ramping up
To Output Regulation Band
100% Resistive Load
Full Load, 12 µH source inductance
60
mA p-p
76
Min
36
Nom
48
34
33
84
5
Max
75
Units
VDC
VDC
VDC
VDC
ms
Inrush Transient
Vin = Vin.max
0.1
A
2
s
MCD10047 Rev. 1.0
Page 3 of 10
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QHS DC-DC Series Data Sheet
Output Specifications
All specifications apply over specified input voltage, output load and temperature range, unless otherwise noted.
Table 5. Output Specifications
Parameter
Output Voltage Setpoint Accuracy
1.8 V
2.5 V
3.3 V
12 V
Output Current*
Line Regulation
Load Regulation
Total output voltage regulation
Remote Sense Headroom***
Dynamic Regulation
Peak Deviation
Settling Time
Admissible Load Capacitance
to 1% error band
I
rated
, Nom Vin
12 V
Output Current Limit Threshold**
Switching Frequency
Vout≤0.97Vout.nom
2.5 V and 1.8 V
3.3 V
12 V
Overvoltage Protection,
Non Latching
Trim Range
Over all input voltage and load
conditions
I
rated
, Vin = Vnom
120
90
110
300
450
400
140
110
50-75% load step change
5
250
27,000
8,000
150
%Vout
μs
μF
μF
%I
rated
kHz
kHz
kHz
%Vout
%Vout
See selection chart for I
rated
Vin.min to Vin.max, I
rated
Vin=Vin.nom, 10% to 100%I
rated
Over all input voltage, load, and
temperature conditions
-3
Conditions/Description
Vin=Vin.nom, Full Load
Min
-1.67
-2.00
-1.5
-2.0
0
Nom
Max
1.67
2.00
1.5
2.0
100
0.2
0.75
3
10%
Units
%Vout
%Vout
%Vout
%Vout
%I
rated
%Vout
%Vout
%Vout
%Vout
* At Iout<Iout.min, the output may contain low frequency component that exceeds ripple specifications.
** Overcurrent protection is non-latching with auto recovery.
*** 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 Vout
MCD10047 Rev. 1.0
Page 4 of 10
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QHS DC-DC Series Data Sheet
Feature Specifications
All specifications apply over specified input voltage, output load and temperature range, unless otherwise noted.
Table 6. Feature Specifications
Parameter
Shutdown (ON/OFF)
Negative Logic
Converter ON
Source Current
Converter OFF
Open Circuit Voltage
Positive Logic
Converter ON
Open Circuit Voltage
Converter OFF
Source Current
Overtemperature Protection
Conditions/Description
On/Off signal is low – converter is ON
-0.5
ON/OFF pin is connected to -Vin
3.5
ON/OFF pin is floating
On/Off signal is low–converter is OFF
3.5
ON/OFF pin is floating
-0.5
ON/OFF pin is connected to -Vin
Average board temperature
105
1.8
1
20
5
20
5
1.8
1
VDC
mADC
VDC
VDC
VDC
VDC
VDC
mADC
°C
Min
Nom
Max
Units
Characteristic Curves
95
90
EFFICIENCY %
EFFICIENCY %
85
80
75
70
65
60
10
20
30
40
50 60
LOAD %
70
80
90
100
EFF.(35V)
EFF.(48V)
EFF.(75V)
95
90
85
80
75
70
65
60
10
20
30
40
50 60 70
LOAD %
80
90 100
EFF.(36V)
EFF.(48V)
EFF.(75V)
Figure 1. QHS12ZH Efficiency vs. Output Load
Figure 3. QHS40ZD Efficiency vs. Output Load
95
90
EFFICIENCY %
85
80
75
70
65
60
10
20
30
40
50 60
LOAD %
70
80
90 100
EFF.(36V)
EFF.(48V)
EFF.(75V)
EFFICIENCY %
90
85
80
75
70
65
60
55
10
20
30
40 50 60
LOAD %
70
80
90 100
EFF.(36V)
EFF.(48V)
EFF.(75V)
Figure 2. QHS40ZE Efficiency vs. Output Load
Figure 4. QHS40ZB Efficiency vs. Output Load
MCD10047 Rev. 1.0
Page 5 of 10
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