QHS Series – Quarter-Brick DC/DC Converter
48V Input
12V, 5V, 3.3V, 2.5V, 1.8V, 1.5V, 1.2V Output
Data Sheet
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
Output voltage trim adjust
UL 1950 Recognition, CSA 22.2 No. 950-95
certification, TUV IEC950
Applications
•
•
•
•
Distributed power architectures
Telecommunications equipment
LAN/WAN applications
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
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
REV. AUG 28, 2002
Page 1 of 9
QHS Series – Quarter-Brick DC/DC Converter
48V Input
12V, 5V, 3.3V, 2.5V, 1.8V, 1.5V, 1.2V Output
Absolute Maximum Ratings
Data Sheet
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
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.
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
Isolation Specifications
All specifications apply over specified input voltage, output load and temperature range, unless otherwise
noted.
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
MOhm
pF
Input Specifications
All specifications apply over specified input voltage, output load and temperature range, unless otherwise
noted.
Parameter
Input Voltage
Turn-On Input Voltage
Turn-Off Input Voltage
Input over voltage protection
Turn-On Time
Input Reflected Ripple Current
Inrush Transient
REV. AUG 28, 2002
Conditions/Description
Continuous
Ramping Up
Ramping Down
Ramping up
To Output Regulation Band
100% Resistive Load
Full Load, 12uH source
inductance
Vin=Vin.max
Min
36
Nom
48
34
33
Max
75
Units
VDC
VDC
VDC
VDC
ms
mA p-p
A
2
s
Page 2 of 9
76
84
5
60
0.1
QHS Series – Quarter-Brick DC/DC Converter
48V Input
12V, 5V, 3.3V, 2.5V, 1.8V, 1.5V, 1.2V Output
Output Specifications
Data Sheet
All specifications apply over specified input voltage, output load and temperature range, unless otherwise
noted.
Parameter
Conditions/Description
Min
Nom
Max
Units
Output Voltage Setpoint Accuracy
Vin=Vin.nom, Full Load
1.8V
-1.67
1.67
%Vout
2.5V
-2.00
2.00
%Vout
3.3V
-1.5
1.5
%Vout
12V
-2.0
2.0
%Vout
Output Current*
0
100
See selection chart for I
rated
%I
rated
Line Regulation
0.2
%Vout
Vin.min to Vin.max, I
rated
Load Regulation
Vin=Vin.nom, 10% to
0.75
%Vout
100%I
rated
Total output voltage regulation
Over all input voltage, load,
-3
3
%Vout
and temperature conditions
Remote Sense Headroom***
10%
%Vout
Dynamic Regulation
50-75% load step change
Peak Deviation
5
%Vout
Settling Time
to 1% error band
250
µs
Admissible Load Capacitance
27,000
µF
I
rated
, Nom Vin
12V
8,000
µF
Output Current Limit Threshold**
Vout≤0.97Vout.nom
110
150
%I
rated
Switching Frequency
2.5V and 1.8V
300
kHz
3.3V
450
kHz
12V
400
kHz
Overvoltage Protection,
Over all input voltage and
120
140
%Vout
Non Latching
load conditions
Trim Range
90
110
%Vout
I
rated
, Vin=Vnom
* 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
Feature Specifications
All specifications apply over specified input voltage, output load and temperature range, unless otherwise
noted.
Parameter
Conditions/Description
Min
Nom
Max
Units
Shutdown (ON/OFF)
Negative Logic
On/Off signal is low – converter is ON
Converter ON
-0.5
1.8
VDC
Source Current
ON/OFF pin is connected to -Vin
1
mADC
Converter OFF
3.5
20
VDC
Open Circuit Voltage
ON/OFF pin is floating
VDC
5
Positive Logic
On/Off signal is low–converter is OFF
Converter ON
3.5
20
VDC
Open Circuit Voltage
ON/OFF pin is floating
VDC
5
Converter OFF
-0.5
1.8
VDC
Source Current
ON/OFF pin is connected to -Vin
1
mADC
Overtemperature
Average board temperature
105
°C
Protection
REV. AUG 28, 2002
Page 3 of 9
QHS Series – Quarter-Brick DC/DC Converter
48V Input
12V, 5V, 3.3V, 2.5V, 1.8V, 1.5V, 1.2V Output
Characteristic curves
90
85
EFFICIENCY %
Data Sheet
95
90
EFFICIENCY %
85
80
75
70
65
60
10
20
30
40
50 60
LOAD %
70
80
90
100
EFF.(35V)
EFF.(48V)
EFF.(75V)
80
75
70
65
60
55
10
20
30
40 50 60
LOAD %
70
80
90 100
EFF.(36V)
EFF.(48V)
EFF.(75V)
Figure 1. QHS12ZH 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)
Figure 4. QHS40ZB Efficiency vs. Output Load
Figure 2. QHS40ZE Efficiency vs. Output Load
95
90
EFFICIENCY %
85
80
75
70
65
60
10
20
30
40
50 60 70
LOAD %
80
90 100
EFF.(36V)
EFF.(48V)
EFF.(75V)
Figure 3. QHS40ZD Efficiency vs. Output Load
REV. AUG 28, 2002
Page 4 of 9
QHS Series – Quarter-Brick DC/DC Converter
48V Input
12V, 5V, 3.3V, 2.5V, 1.8V, 1.5V, 1.2V Output
5
4.5
4
3.5
3
2.5
2
1.5
1
0.5
0
0
10
20
30
40
50
Input Voltage (V)
60
70
3
2.5
Input Current (A)
2
1.5
1
0.5
0
0
10
Data Sheet
Input Current (A)
20
30
40
50
Input Voltage (V)
60
70
Figure 5. QHS12ZH Input Characteristic
5
4.5
4
Input Current (A)
3.5
3
2.5
2
1.5
1
0.5
0
0
10
20
30
40
50
Input Voltage (V)
60
70
Figure 8. QHS40ZB Input Characteristic
Figure 6. QHS40ZE Input Characteristic
4
3.5
Input Current (A)
3
2.5
2
1.5
1
0.5
0
0
10
20
30
40
50
Input Voltage (V)
60
70
Figure 7. QHS40ZD Input Characteristic
REV. AUG 28, 2002
Page 5 of 9
Analog electronics
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