QLS30 DC-DC Series Data Sheet
30A Quarter-Brick Converter
Features
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Cost-effective single board design
Low profile – 11 mm height
Input/output isolation: 1500VDC, Basic
insulation
High efficiency
Output back-drive protection
Start-up into high capacitive load
Low conducted and radiated EMI
Output overcurrent protection
Output overvoltage protection
Overtemperature protection
Remote sense
Set point accuracy ±1%
Remote on/off (primary referenced), positive or
negative logic
Output voltage trim adjust, positive or negative
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
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Description
The new QLS30 Series of single output DC-DC converters features single board, multi-layer construction and an
SMT design that is highly reliable due to the low component count and minimal manufacturing touch time. The
QLS30 Series uses fewer components than any other equivalently rated single board converter. The converters
can deliver a maximum of 30 amps with a typical efficiency of 85%. The QLS provides superior thermal
performance, with minimal derating. The QLS30ZB model converter can deliver 22.8 amperes at 1.8 volt output in
ambient conditions of 65°C and 200 LFM. This full featured, low profile converter offers input undervoltage lockout,
plus overload, overvoltage, and overtemperature protection. Interface features include remote on/off, remote
sense, and output voltage trim.
Model Selection
Model
Input
Voltage
VDC
36-75
36-75
36-75
Input
Current, Max
ADC
1.5
1.3
1.1
Output
Voltage
Vout, VDC
1.8
1.5
1.2
Output Rated
Current
I
rated,
ADC
30
30
30
Output
Ripple/Noise,
mV p-p
100
100
100
Typical
Efficiency @
I
rated,
%
86
85
84
QLS30ZB
QLS30ZA
QLS30ZY
This product is intended for integration into end-use equipment. All the required procedures for CE marking of end-use equipment
should be followed.
REV. FEB 03, 2004
Page 1 of 9
QLS30 DC-DC Series Data Sheet
30A Quarter-Brick Converter
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.
Parameter
Input voltage
Operating Temperature
Storage Temperature
ON/OFF Control Voltage
Referenced to -Vin
Conditions/Description
Continuous
Transient, 100ms
At 100% load
Min
Max
75
100
100
125
50
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
Standard process
Per Bellcore TR-NWT-000332
Conditions/Description
Halfsine wave, 3 axes
GR-63-Core, Section 5.A.2
Min
50
1
Nom
Max
Units
g
1.2/35
Yes
1,980
Oz/g
kHrs
Isolation Specifications
All specifications apply over specified input voltage, output load, and temperature range, unless otherwise noted.
Parameter
Insulation Safety Rating
Isolation Voltage
Isolation Resistance
Isolation Capacitance
Conditions/Description
Min
1500
10
1800
Nom
Basic
Max
Units
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
Turn-On Time
Input Reflected Ripple Current
Inrush Transient
Conditions/Description
Continuous
Ramping Up
Ramping Down
To Output Regulation Band
100% Resistive Load
Full Load, 12µH source inductance
Vin=Vin.max
Min
36
Nom
48
33
32
5
10
50
0.1
Max
75
Units
VDC
VDC
VDC
ms
mA p-p
As
2
REV. FEB 03, 2004
Page 2 of 9
QLS30 DC-DC Series Data Sheet
30A Quarter-Brick Converter
Output Specifications
All specifications apply over specified input voltage, output load, and temperature range, unless otherwise noted.
Parameter
Output Voltage Setpoint Accuracy
Output Current*
Line Regulation
Load Regulation
Total output voltage regulation
Remote Sense Headroom
Dynamic Regulation
Peak Deviation
Settling Time
Admissible Load Capacitance
Output Current Limit Threshold**
Switching Frequency
Overvoltage Protection,
Non Latching
Trim Range
Conditions/Description
Vin=Vin.nom, Full Load
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
Min
-1
10
Nom
Max
1
100
0.2
0.2
Units
%Vout
%I
rated
%Vout
%Vout
%Vout
VDC
-2
2
0.5
50-75% load step change
to 1% error band
6
500
%Vout
µs
µF
I
rated
, Nom Vin
Vout=0.97Vout.nom
20,000
110
300
140
%I
rated
kHz
Overall input voltage and
load conditions
I
rated
, Vin=Vnom
120
140
%Vout
90
110
%Vout
* At Iout<Iout.min, the output may contain low frequency component that exceeds ripple specifications.
** Overcurrent protection is non-latching with auto recovery.
REV. FEB 03, 2004
Page 3 of 9
QLS30 DC-DC Series Data Sheet
30A Quarter-Brick Converter
Feature Specifications
All specifications apply over specified input voltage, output load, and temperature range, unless otherwise noted.
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
ON/OFF pin is connected to -Vin
Average Board Temperature
105
ON/OFF pin is floating
-1.0
ON/OFF pin is floating
On/Off signal is low –converter is OFF
3.5
2.0
2.5
50
5
1.8
1
VDC
VDC
VDC
mADC
°C
ON/OFF pin is connected to -Vin
3.5
On/Off signal is low – converter is ON
-1.0
2.1
1.8
150
5
VDC
mADC
VDC
VDC
Conditions/Description
Min
Nom
Max
Units
Characteristic Curves
95
90
90
Efficiency, %
Efficiency, %
85
80
75
70
65
60
55
50
0
3
6
9
12
15
18
21
24
27
30
36V
48V
75V
85
80
75
70
65
60
55
50
0
3
6
9
12
15
18
21
24
27
30
36V
48V
75V
Output current, A
Output current, A
Figure 1. QLS30ZB Efficiency vs. Output Load
Figure 2. QLS30ZA Efficiency vs. Output Load
REV. FEB 03, 2004
Page 4 of 9
QLS30 DC-DC Series Data Sheet
30A Quarter-Brick Converter
1.6
95
90
EFFICIENCY%
85
80
75
70
65
60
55
50
0
3
6
9
12
15
18
21
24
27
30
Figure 6. QLS30ZY Input Characteristic
Output current, A
36V
48V
75V
Input current, ADC
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
0
10
20
30
40
50
60
70
Input voltage, VDC
Figure 3. QLS30ZY Efficiency vs. Output Load
2.2
2.0
1.8
Input Current, ADC
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
0
10
20
30
40
50
60
70
Input Voltage, VDC
Figure 4. QLS30ZB Input Characteristic
1.8
1.6
Input current, ADC
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
0
10
20
30
40
50
60
70
Input voltage, VDC
Figure 5. QLS30ZA Input Characteristic
REV. FEB 03, 2004
Page 5 of 9
