QLS25ZD-N9 [BEL]
DC-DC Regulated Power Supply Module, 1 Output, Hybrid,;
| 型号： | QLS25ZD-N9 |
| 厂家： | 
BEL FUSE INC. |
| 描述： | DC-DC Regulated Power Supply Module, 1 Output, Hybrid, |
| 文件： | 总8页 (文件大小：211K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
QLS25 DC-DC Series Data Sheet
25A Quarter-Brick
Features
•
•
•
•
RoHS lead solder exemption compliant
Cost-effective single board design
Low profile – 11 mm height
Input/output isolation: 1500VDC, basic
insulation
•
•
•
•
•
•
•
•
•
•
High efficiency - up to 90% at full load
Start-up into high capacitive load
Low conducted and radiated EMI
Output overcurrent protection
Output overvoltage protection
Back drive protection
Applications
• Distributed power architectures
• Telecommunications equipment
• LAN/WAN applications
Overtemperature protection
Remote sense
• Data processing applications
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
Description
The QLS25 is a new series of cost-effective, high-density single output DC-DC converters providing onboard
conversion of standard telecom and datacom input voltages into isolated low voltage outputs in a through-hole
mounting package. High efficiencies and a patent-pending board design significantly improve thermal
characteristics by evening out hot spots and enhance product reliability.
Model Selection
Model
Input
Voltage
VDC
Input
Current, Max
ADC
Output
Voltage
Vout,
Output Rated
Current
I rated,
Output
Ripple/Noise,
mV p-p
Typical
Efficiency @
I rated,
%
VDC
ADC
QLS20ZG
QLS25ZE
QLS25ZD
36-75
36-75
36-75
4.8
3.3
2.5
5.0
3.3
2.5
20
25
25
150
100
100
90
89
87
This product is intended for integration into end-use equipment. All the required procedures for CE marking of end-use equipment
should be followed.
SEP 12, 2003 revised to OCT 26, 2006
Page 1 of 8
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QLS25 DC-DC Series Data Sheet
25A Quarter-Brick
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
Conditions/Description
Continuous
Min
Max
75
Units
VDC
VDC
°C
Input voltage
Transient, 100ms
100
100
125
50
Operating Temperature
Storage Temperature
ON/OFF Control Voltage
PC Board Temperature
-40
-40
°C
VDC
Referenced to -Vin
Environmental and Mechanical Specifications
All specifications apply over specified input voltage, output load, and temperature range, unless otherwise noted.
Parameter
Shock
Conditions/Description
Halfsine wave, 3 axes
Min
50
1
Nom
Max
Units
g
Sinusoidal Vibration
Weight
GR-63-Core, Section 5.4.2
g
1.2/35
Yes
Oz/g
Water Washing
MTBF
Standard process
Per Bellcore TR-NWT-000332
1,980
kHrs
Isolation Specifications
All specifications apply over specified input voltage, output load, and temperature range, unless otherwise noted.
Parameter
Conditions/Description
Min
Nom
Max
Units
Insulation Safety Rating
Isolation Voltage
Basic
1500
10
VDC
MOhm
pF
Isolation Resistance
Isolation Capacitance
1100
Input Specifications
All specifications apply over specified input voltage, output load, and temperature range, unless otherwise noted.
Parameter
Input Voltage
Conditions/Description
Continuous
Min
Nom
48
Max
Units
VDC
VDC
VDC
mS
36
75
Turn-On Input Voltage
Turn-Off Input Voltage
Turn-On Time
Ramping Up
33
Ramping Down
32
To Output Regulation Band
100% Resistive Load
Full Load, 12µH source inductance
5
10
60
Input Reflected Ripple Current
Inrush Transient
mA p-p
A2s
Vin=Vin.max
0.1
SEP 12, 2003 revised to OCT 26, 2006
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QLS25 DC-DC Series Data Sheet
25A Quarter-Brick
Output Specifications
All specifications apply over specified input voltage, output load and temperature range, unless otherwise noted.
Parameter
Output Voltage Setpoint Accuracy
Output Current*
Conditions/Description
Vin=Vin.nom, Full Load
Min
-1
Nom
Max
1
Units
%Vout
%Irated
%Vout
%Vout
%Vout
See selection chart for Irated
Vin.min to Vin.max, Irated
10
100
0.2
0.2
2
Line Regulation
Load Regulation
Vin=Vin.nom, 10% to 100%Irated
Total output voltage regulation
Over all input voltage, load, and
temperature conditions
-2
Remote Sense Headroom
Dynamic Regulation
Peak Deviation
0.5
VDC
50-75% load step change
5
%Vout
μs
Settling Time
to 1% error band
Irated, Nom Vin
150
Admissible Load Capacitance
Output Current Limit Threshold**
Switching Frequency
Overvoltage Protection,
Non Latching
20,000
110
μF
Vout≤0.97Vout.nom
140
140
110
%Irated
kHz
270
Over all input voltage and load
conditions
120
90
%Vout
Trim Range
Irated, Vin=Vnom
%Vout
* 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
Conditions/Description
On/Off signal is low – converter is ON
ON/OFF pin is connected to -Vin
Min
Nom
Max
Units
-1.0
3.5
1.8
1
50
5
VDC
mADC
VDC
ON/OFF pin is floating
On/Off signal is low–converter is OFF
VDC
Converter ON
3.5
50
5
1.8
1
VDC
VDC
VDC
mADC
°C
Open Circuit Voltage
Converter OFF
Source Current
ON/OFF pin is floating
-1.0
ON/OFF pin is connected to -Vin
Average board temperature
Overtemperature
Protection
105
SEP 12, 2003 revised to OCT 26, 2006
Page 3 of 8
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QLS25 DC-DC Series Data Sheet
25A Quarter-Brick
Characteristic Curves
4
3.5
3
95
90
85
80
75
70
65
2.5
2
1.5
1
36V
48V
75V
0.5
0
0
10
20
30
40
50
60
70
Input voltage, VDC
0
4
8
12
16
20
Output current, A
Figure 4. QLS20ZG Input Characteristic
Figure 1. QLS20ZG Efficiency vs. Output Load
3.5
3
95
90
85
2.5
2
1.5
1
80
36V
0.5
0
75
48V
75V
70
0
10
20
30
40
50
60
70
Input voltage, VDC
65
0
5
10
15
20
25
Figure 5.QLS25ZE Input Characteristic
Output current, A
Figure 2. QLS25ZE Efficiency vs. Output Load
3.0
2.5
2.0
1.5
1.0
0.5
0.0
95
90
85
80
75
70
65
36V
48V
75V
0
10
20
30
40
50
60
70
Input voltage, VDC
Figure 6. QLS25ZD Input Characteristic
0
5
10
15
20
25
Output current, A
Figure 3. QLS25ZE Efficiency vs. Output Load
SEP 12, 2003 revised to OCT 26, 2006
Page 4 of 8
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QLS25 DC-DC Series Data Sheet
25A Quarter-Brick
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.
Typical Application
Figure 7 shows the recommended connections for
the QLS25 Series converter.
Note:
If the ON/OFF pin is not used, it can be left floating (positive logic),
or connected to the -Vin pin (negative logic).
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 QLS25 Series.
Figure 7. Typical application of QLS25 Series
The QLS25 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
Negative Trim
The QLS25 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 Figure 8.
converter.
A minimum of a 33μF electrolytic
capacitor with the ESR<0.7Ω is recommended for
the QLS25 Series.
The negative trim schematic is shown in Figure 8.
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.
Shutdown Feature Description
The ON/OFF pin in the QLS25 Series converters
functions as a normal soft shutdown. It is referenced
to the –Vin pin (see Figure 7). With the 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.
Figure 8. QLS25 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.
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 resistor between
the ON/OFF pin and the +Vin pin.
A− B×ΔV
RTRIM
=
,
kΩ
(1)
ΔV
SEP 12, 2003 revised to OCT 26, 2006
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QLS25 DC-DC Series Data Sheet
25A Quarter-Brick
3. The QLS25 Series converters will trim down further than the
10% limit. In general, this is permissible. The user must
confirm that the results are acceptable in the application.
where A and B are constants from the table below,
and ΔV is the absolute value of the desired change
in the output voltage in Volts.
Model
Trim up
Trim down
Safety Considerations
A
B
A
11.58
3.5
B
The QLS25 Series converters feature 1500 Volt DC
isolation from input to output. The input to output
QLS20ZG
QLS25ZE
QLS25ZD
3.77
2.07
1.27
6.81
3.92
3.92
9.88
5.61
4.95
resistance is greater than 10MOhm.
These
1.31
converters are provided with Basic insulation
between input and output circuits according to all
IEC60950 based standards. Nevertheless, if the
system using the converter needs to receive safety
agency approval, certain rules must be followed in
the design of the system. In particular, all of the
creepage and clearance requirements of the end-use
Industry Standard Positive Trim (suffix –T)
The -T option 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 the Figure 9.
safety requirements must be observed.
These
documents include UL60950 - CSA60950-00 and
EN60950, although other or additional requirements
may be needed for specific applications.
The QLS25 Series converters have no internal fuse.
The external fuse must be provided to protect the
system from catastrophic failure as shown in
Figure 7. The fuse with a rating not greater than 4A
is recommended. The user can select a lower rating
fuse based upon the highest inrush transient at the
maximum input voltage and the maximum input
current of the converter, which occurs at the
minimum input voltage. Both input traces and the
chassis ground trace (if applicable) must be capable
of conducting a current of 1.5 times the value of the
fuse without opening. The fuse must not be placed
in the grounded input line, if any.
Figure 9. QLS25 Series Positive Trim Schematic
In order for the output of the QLS25 Series converter
to be considered as SELV (Safety Extra Low
Voltage) or TNV-1, according to all IEC60950 based
standards, one of the following requirements must be
met in the system design:
The equations below determine the trim resistor
value required to achieve a ΔV change in the output
voltage.
Vout(100+ΔV%) 100+2ΔV%
⎛
⎝
⎞
⎟
R = 5.11
−
,kΩ
⎜
UP
1.225ΔV%
ΔV%
⎠
•
•
If the voltage source feeding the module is SELV
or TNV-2, the output of the converter may be
grounded or ungrounded.
If the voltage source feeding the module is ELV,
the output of the converter may be considered
SELV only if the output is grounded per the
requirements of the standard.
100
⎛
⎝
⎞
⎠
RDOWN = 5.11
− 2 , kΩ
⎜
⎟
ΔV %
where ΔV% is the output voltage change expressed
in percents of the nominal output voltage, Vout.
Notes:
•
If the voltage source feeding the module is a
Hazardous Voltage Secondary Circuit, the
voltage source feeding the module must be
provided with at least Basic insulation between
the source to the converter and any hazardous
1. When the output voltage is trimmed up, the output power
from the converter must not exceed its maximum rating. The
power is determined by measuring the output voltage on the
output pins, and multiplying it by the output current.
2. In order to avoid creating apparent load regulation
degradation, it is important that the trim resistors are
connected directly to the remote sense pins, and not to the
load or to traces going to the load.
voltages.
QLS25 converter, must pass
The entire system, including the
dielectric
a
withstand test for Reinforced insulation. Design
of this type of systems requires expert
SEP 12, 2003 revised to OCT 26, 2006
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QLS25 DC-DC Series Data Sheet
25A Quarter-Brick
engineering and understanding of the overall
safety requirements and should be performed by
qualified personnel.
25
20
15
Thermal Considerations
The QLS25 Series converters are designed for
natural or forced convection cooling. The maximum
allowable output current of the converters is
determined by meeting the derating criteria for all
components used in the converters. For example,
the maximum semiconductor junction temperature is
not allowed to exceed 120°C to ensure reliable long-
term operation of the converters. Contact Power-
One for the complete list of the derating criteria.
10
0
100LFM
200LFM
300LFM
400LFM
5
0
25 30 35 40 45 50 55 60 65 70 75 80 85
Ambient Temperature (C)
The graphs in Figures 10-12 show the maximum
output current of the QLS25 Series converters at
different ambient temperatures under both natural
and forced (longitudinal airflow direction, from pin 1
to pin 3) convection.
Figure 11. QLS25ZE (3.3V) Derating Curves
25
20
For example, from Figure 11, the QLS25ZE
operating at 55C can deliver up to 18A reliably with
100LFM forced air, while up to 25A reliably with
400LFM forced air.
15
0
10
100LFM
25
20
15
200LFM
300LFM
400LFM
5
0
25 30 35 40 45 50 55 60 65 70 75 80 85
Ambient Temperature (C)
0
10
5
100LFM
200LFM
300LFM
400LFM
Figure 12. QLS25ZD (2.5V) Derating Curves
0
25 30 35 40 45 50 55 60 65 70 75 80 85
Ambient Temperature (°C)
Figure 10. QLS20ZG (5V) Derating Curves
SEP 12, 2003 revised to OCT 26, 2006
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QLS25 DC-DC Series Data Sheet
25A Quarter-Brick
Mechanical Drawing
PIN
1
FUNCTION
-Vin
2
3
4
5
6
7
8
On/Off
+Vin
-Vout
-Sense
Trim
+Sense
+Vout
Tolerances: .xx + .020 (.5)
.xxx + .010 (.25)
+ 0.002 (.05)
Pin Diameter
Ordering Information
Options
Remote ON/OFF
Suffixes to add to part number
Positive- Standard, no suffix required
Negative- Add “N” suffix
Trim
Negative- No suffix required
Positive - Add “T” suffix
Pin Length
0.18”- Standard, no suffix required
0.11”- Add “8” suffix
0.15”- Add “9” suffix
Notes
1. Consult factory for the complete list of available options.
NUCLEAR AND MEDICAL APPLICATIONS - Power-One products are not designed, intended for use in, or authorized for use as critical
components in life support systems, equipment used in hazardous environments, or nuclear control systems without the express written
consent of the respective divisional president of Power-One, Inc.
TECHNICAL REVISIONS - The appearance of products, including safety agency certifications pictured on labels, may change depending on
the date manufactured. Specifications are subject to change without notice.
SEP 12, 2003 revised to OCT 26, 2006
Page 8 of 8
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