QLS30 Series – 30A Quarter-Brick DC/DC Converter
48V Input
1.8V, 1.5V, 1.2V Output
Data Sheet
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
UL 1950 Recognition, CSA 22.2 No. 950-95
certification, TUV IEC950
Applications
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Distributed power architectures
Telecommunications equipment
LAN/WAN applications
Data processing applications
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, overload, overvoltage and overtemperature protection. Interface
features include remote on/off, remote sense and output voltage trim.
Selection Chart
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. 10/1
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QLS30 Series – 30A Quarter-Brick DC/DC Converter
48V Input
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, 100mS
At 100% load
Referenced to -Vin
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
Conditions/Description
Halfsine wave, 3 axes
GR-63-Core, Section 5.A.2
Standard process
Per Bellcore TR-NWT-000332
Min
50
1
Nom
Max
Units
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 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, 12uH source
inductance
Vin=Vin.max
Min
36
Nom
48
33
32
5
Max
75
Units
VDC
VDC
VDC
mS
mA p-p
A
2
s
10
50
0.1
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QLS30 Series – 30A Quarter-Brick DC/DC Converter
48V Input
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
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
50-75% load step change
to 1% error band
I
rated
, Nom Vin
Vout=0.97Vout.nom
Over all input voltage and
load conditions
I
rated
, Vin=Vnom
6
500
20,000
110
300
120
90
140
110
140
%Vout
µS
µF
%I
rated
kHz
%Vout
%Vout
Min
-1
10
Nom
Max
1
100
0.2
0.2
2
0.5
Units
%Vout
%I
rated
%Vout
%Vout
%Vout
VDC
-2
* At Iout<Iout.min, the output may contain low frequency component that exceeds ripple specifications.
** Overcurrent protection is non-latching with auto recovery.
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
Conditions/Description
On/Off signal is low – converter is ON
-1.0
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
-1.0
ON/OFF pin is connected to -Vin
Average Board Temperature
105
2.0
2.5
2.1
1.8
150
5
50
5
1.8
1
VDC
mADC
VDC
VDC
VDC
VDC
VDC
mADC
°C
Min
Nom
Max
Units
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QLS30 Series – 30A Quarter-Brick DC/DC Converter
48V Input
1.8V, 1.5V, 1.2V Output
Characteristic Curves
2.2
Data Sheet
95
Input Current, ADC
2.0
1.8
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
90
85
Efficiency, %
80
75
70
65
60
55
50
0
3
6
9
12
15
18
21
24
27
30
36V
48V
75V
Input Voltage, VDC
Output current, A
Fig. 1 QLS30ZB Efficiency vs. Output Load
Fig. 4 QLS30ZB Input Characteristic
1.8
90
80
75
70
65
60
55
50
0
3
6
9
12
15
18
21
24
27
30
36V
48V
75V
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
Efficiency, %
85
Output current, A
Fig. 2 QLS30ZA Efficiency vs. Output Load
95
85
80
75
70
65
60
55
50
0
3
6
9
12
15
18
21
24
27
30
Output current, A
36V
48V
75V
Fig. 5 QLS30ZA Input Characteristic
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
90
EFFICIENCY%
Input voltage, VDC
Fig. 3 QLS30ZY Efficiency vs. Output Load
Fig. 6 QLS30ZY Input Characteristic
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QLS30 Series – 30A Quarter-Brick DC/DC Converter
48V Input
1.8V, 1.5V, 1.2V Output
Typical Application
Figure 7 below shows the recommended
connections for the QLS30 series converter.
QLS30ZX
Fuse
+Vi
+Vo
+Sense
C1
On/Off
Trim
-Sense
-Vi
-Vo
C2
C3
Data Sheet
resistor between the ON/OFF pin and the +Vin
pin.
When the ON/OFF pin is used to achieve remote
control, the user must take care to insure that the
pin reference for the control is really the -Vin pin.
The control signal must not be referenced ahead
of EMI filtering, or remotely from the unit.
Optically coupling the information and locating the
optical coupler directly at the module will solve
any of these problems.
Note:
If the ON/OFF pin is not used, it can be left
floating (positive logic), or connected to the -Vin
pin (negative logic).
Fig.7 Typical application of QLS30 series
The QLS30 series converters do not require any
external components for proper operation.
However, if the distribution of the input voltage to
the converter contains significant inductance, the
capacitor C1 may be required to enhance
performance of the converter. A minimum of a
33μF electrolytic capacitor with the ESR<0.7Ω
is
recommended for the QLS30 series.
Refer to the “Inrush Current Control Application
Note” on www.power-one.com for suggestions on
how to limit the magnitude of the inrush current.
For output decoupling we recommend to use a
10μF tantalum and a 1μF ceramic capacitors
connected directly across the output pins of the
converter.
Note that the capacitors do not
substitute the filtering required by the load.
Output Voltage Trim
The trim feature allows the user to adjust the
output voltage from the nominal. This can be used
to accommodate a different requirement or to do
production margin testing.
There are two
variances available in the QLS30 series.
Negative Trim (No suffix)
The QLS30 negative trim units trim up with a
resistor from the TRIM pin to the –Sense pin and
trim down with a resistor from the TRIM pin to the
+Sense pin, as shown in Fig.8.
The negative trim schematic is shown in Figure 8.
Shutdown Feature Description
The ON/OFF pin in the QLS30 series converters
functions as a normal soft shutdown.
It is
referenced to the –Vin pin (see Figure 7). With
positive logic, when the ON/OFF pin is pulled low,
the output is turned off and the unit goes into a
very low input power mode.
With negative logic, when the ON/OFF pin is
pulled low, the unit is turned on. An open collector
switch is recommended to control the voltage
between the ON/OFF pin and the -Vin pin of the
converter.
The ON/OFF pin is pulled up
internally, so no external voltage source is
required. The user should avoid connecting a
REV. 10/01
Fig.8 QLS30 series negative trim schematic
The general equation (1) for changing the output
voltage on the negative trim modules is invariant,
but the constants in the equation change due to
different internal values.
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