QLS25ZE-NT8 [BEL]
DC-DC Regulated Power Supply Module, 1 Output, Hybrid,;
| 型号： | QLS25ZE-NT8 |
| 厂家： | 
BEL FUSE INC. |
| 描述： | DC-DC Regulated Power Supply Module, 1 Output, Hybrid, |
| 文件： | 总10页 (文件大小：876K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
The QLS25 is a series of cost-effective, high-density single output DC-
DC converters providing on-board 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.
RoHS lead solder exemption compliant
Cost-effective single board design
Low profile – 11 mm height
Input/output isolation: 1500 VDC, 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
Overtemperature protection
Remote sense
Set point accuracy 1%
Remote on/off (primary referenced), positive or negative logic
Output voltage trim adjust, positive or negative
Approved to the latest edition of the following standards:
UL/CSA60950-1, IEC60950-1 and EN60950-1.
Distributed power architectures
Telecommunications equipment
LAN/WAN applications
Data processing applications
Asia-Pacific
Europe, Middle East
North America
+86 755 298 85888
+353 61 225 977
+1 866 513 2839
© 2015 Bel Power Solutions, Inc.
BCD.00736_AA
2
INPUT
VOLTAGE
VDC
INPUT
CURRENT,
MAX ADC
OUTPUT
VOLTAGE
VOUT, VDC
OUTPUT RATED
CURRENT I RATED,
ADC
OUTPUT
RIPPLE/NOISE,
MV P-P
TYPICAL
EFFICIENCY
@ I RATED, %
MODEL
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.
Model numbers highlighted in yellow or shaded are not recommended for new designs.
All specifications apply over specified input voltage, output load, and temperature range, unless otherwise noted.
PARAMETER
CONDITIONS / DESCRIPTION
MIN
NOM
MAX
UNITS
Absolute Maximum Ratings1
Continuous
75
VDC
VDC
°C
Input Voltage
Transient, 100ms
PC Board Temperature
100
100
Operating Temperature
Storage Temperature
-40
-40
125
50
°C
ON/OFF Control Voltage
Isolation Characteristics
Insulation Safety Rating
Isolation Voltage
Referenced to -Vin
VDC
Basic
1500
10
VDC
MΩ
pF
Isolation Resistance
Isolation Capacitance
Feature Characteristics
Shutdown (ON/OFF) Negative Logic
1100
On/Off signal is low – converter is ON
Converter ON
-1.0
3.5
1.8
1
VDC
mADC
VDC
Source Current
ON/OFF pin is connected to -Vin
Converter OFF
50
5
Open Circuit Voltage
Shutdown (ON/OFF) Positive Logic
ON/OFF pin is floating
VDC
On/Off signal is low –converter is OFF
Converter ON
3.5
-1
50
5
VDC
VDC
VDC
mADC
°C
Open Circuit Voltage
Converter OFF
ON/OFF pin is floating
1.8
1
Source Current
ON/OFF pin is connected to -Vin
Average Board Temperature
Overtemperature Protection
105
Input Characteristics
Operating Input Voltage Range
Turn-On Input Voltage
Turn-Off Input Voltage
Continuous
36
48
33
32
75
VDC
VDC
VDC
Ramping Up
Ramping Down
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3
To Output Regulation Band
100% Resistive Load
Turn-On Time
5
10
ms
Input Reflected Ripple Current
Inrush Transient
Full Load, 12µH source inductance
Vin=Vin.max
60
mA p-p
A2s
0.1
Output Characteristics
Output Voltage Setpoint Accuracy
Output Current Range2
Line Regulation
Vin=Vin.nom, Full Load
-1
1
%Vout
%Irated
%Vout
%Vout
See selection chart for Irated
Vin.min to Vin.max, Irated
Vin=Vin.nom, 10% to 100%Irated
10
100
0.2
0.2
Load Regulation
Over all input voltage, load, and temperature
conditions
Total output voltage regulation
-2
2
%Vout
VDC
Remote Sense Headroom
Dynamic Regulation
Peak Deviation
0.5
50-75% load step change
5
%Vout
μs
Settling Time
to 1% error band
Irated, Nom Vin
150
μF
Admissible Load Capacitance
Output Current Limit Threshold3
Switching Frequency
20,000
110
Vout ≤ 0.97Vout.nom
140
%Irated
kHz
270
Overvoltage Protection,
Non Latching
Overall input voltage and
load conditions
120
90
140
110
%Vout
%Vout
Trim Range
Irated, Vin=Vnom
Enviromental and Mechanical
Weight
1.2/35
Oz/g
Sinusoidal Vibration
Shock
GR-63-Core, Section 5.4.2
Halfsine wave, 3 axes
Standard process
1
g
g
50
Water Washing
Reliability
Yes
MTBF
Per Bellcore TR-NWT-000332
1,980
kHrs
1 Stresses in excess of the absolute maximum ratings may cause performance degradation, adversely effect long-term reliability, and
cause permanent damage to the converter
2 At Iout<Iout.min, the output may contain low frequency component that exceeds ripple specifications.
3
Overcurrent protection is non-latching with auto recovery.
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4
Figure 1 shows the recommended connections for the QLS25 Series converter.
Figure 1. 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 converter. A minimum of a 33μF electrolytic capacitor with the ESR<0.7 is recommended for the QLS25 Series.
Refer to the “Inrush Current Control Application Note” on belpowersolutions.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.
The ON/OFF pin in the QLS25 Series converters functions as a normal soft shutdown. It is referenced to the –Vin pin (see
Figure 1). 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.
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.
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).
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.
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2.4
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 Fig.2.
The negative trim schematic is shown in Figure 2.
Figure 2. 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.
A B V
RTRIM
,
[kΩ]
(1)
V
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
A
B
A
B
QLS20ZG
QLS25ZE
QLS25ZD
3.77
2.07
1.27
6.81
3.92
3.92
11.58
3.5
9.88
5.61
4.95
1.31
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2.5
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 3.
Figure 3. QLS25 Series Positive Trim Schematic
The equations below determine the trim resistor value required to achieve a ΔV change in the output voltage.
Vout(100 V%) 100 2V%
, kΩ
RUP 5.11
1.225V%
V%
100
RDOWN 5.11
2
, kΩ
V%
Where,
ΔV% is the output voltage change expressed in percents of the nominal output voltage, Vout.
Notes:
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.
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.
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2.6
95
90
85
80
75
70
65
4
3,5
3
2,5
2
36V
48V
75V
1,5
1
0,5
0
0
10
20
Input voltage, VDC
Figure 5. QLS20ZG Input Characteristic
30
40
50
60
70
0
4
8
12
16
20
Output current, A
Figure 4. QLS20ZG Efficiency vs. Output Load
95
90
85
80
75
70
65
4
3,5
3
2,5
2
1,5
1
36V
48V
75V
0,5
0
0
10
20
30
Input voltage, VDC
Figure 7. QLS25ZE Input Characteristic
40
50
60
70
0
5
10
15
20
25
Output current, A
Figure 6. QLS25ZE Efficiency vs. Output Load
95
90
85
80
75
70
65
3,0
2,5
2,0
1,5
1,0
0,5
0,0
36V
48V
75V
0
10
20
30
40
50
60
70
0
5
10
Output current, A
Figure 8. QLS25ZE Efficiency vs. Output Load
15
20
25
Input voltage, VDC
Figure 9. QLS25ZD Input Characteristic
tech.support@psbel.com
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The QLS25 Series converters feature 1500 Volt DC isolation from input to output. The input to output resistance is greater than
10MOhm. These 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 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.
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:
●
●
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.
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 voltages. The entire
system, including the QLS25 converter, must pass a dielectric withstand test for Reinforced insulation. Design of this type of
systems requires expert engineering and understanding of the overall safety requirements and should be performed by qualified
personnel.
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 Bel Power Solutions for the complete list of the derating criteria.
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.
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.
25
20
15
10
5
25
20
15
10
5
0
0
100LFM
200LFM
300LFM
400LFM
100LFM
200LFM
300LFM
400LFM
0
0
25 30 35 40 45 50 55 60 65 70 75 80 85
Ambient Temperature (°C)
25 30 35 40 45 50 55 60 65 70 75 80 85
Ambient Temperature (C)
Figure 11. QLS25ZE (3.3V) Derating Curves
Figure 10. QLS20ZG (5V) Derating Curves
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25
20
15
10
5
0
100LFM
200LFM
300LFM
400LFM
0
25 30 35 40 45 50 55 60 65 70 75 80 85
Ambient Temperature (C)
Figure 12. QLS25ZD (2.5V) Derating Curves
PIN
FUNCTION
-Vin
1
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
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OPTIONS
SUFFIXES TO ADD TO PART NUMBER
Positive- Standard, no suffix required
Remote ON/OFF
Trim
Negative- Add “N” suffix
Negative- no suffix required
Positive - Add “T” suffix
0.18”- Standard, no suffix required
0.11”- Add “8” suffix
Pin Length
0.15”- Add “9” suffix
Note:
Consult factory for the complete list of available options.
NUCLEAR AND MEDICAL APPLICATIONS - Products are not designed or intended for use as critical components in life support systems,
equipment used in hazardous environments, or nuclear control systems.
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.
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