QKS48T21120-PCA0 [BEL]
DC-DC Regulated Power Supply Module, 1 Output, 252W, Hybrid, PACKAGE-5;
| 型号： | QKS48T21120-PCA0 |
| 厂家： | 
BEL FUSE INC. |
| 描述： | DC-DC Regulated Power Supply Module, 1 Output, 252W, Hybrid, PACKAGE-5 |
| 文件： | 总9页 (文件大小：271K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
QKS48T21120 DC-DC Bus Converter Data Sheet
Quarter-Brick with 48VDC Input; 12VDC @ 21A Output
Benefits
• Simplifies power system design; reduces design
time and technical risk
• Compatible with all (12 Vin nom.) POLs available in
the market
Features
• RoHS lead free solder and lead solder exempted
products are available
• Loosely regulated output
• High output power of 252 W
• Efficiency to 94%
• Wide-input voltage range from 36 to 75 VDC
• 100V/100ms input voltage surge withstand
• Input-to-output isolation: 1500 VDC
• Basic insulation
Applications
• Power systems utilizing Intermediate Bus
Architecture
• Networking equipment
• Data/voice processing
• Wireless communications
• Computing
• Backdrive protection
• Start-up into pre-biased load
• Output overcurrent protection
• Output overvoltage protection
• Overtemperature protection
• ATCA
• Remote on/off (primary referenced), positive or
negative logic option
• Designed to comply with NEBS GR-1089 and GR-63
• Safety: UL60950-1, CSA C22.2 No. 60950-1,TUV
EN60950-1, IEC60950-1
Description
The QKS is a high density and highly efficient, isolated DC-DC converter that operates over an input voltage range
of 36 VDC to 75VDC. It provides a 12 VDC nominal, loosely-regulated output voltage at up to 21 ADC of current.
The converter is an ideal choice for building a complete power system utilizing the Intermediate Bus Architecture
(IBA). The thermally-optimized construction of the QKS allows the converter to provide high output current over a
wide operating temperature range while maintaining a safe guardband for component electrical and thermal
ratings. The QKS employs 100% surface-mount components for consistency and reliability in the production
process.
Model Selection
Input
Voltage
VDC
Input
Current,
Max ADC
Output
Voltage
VDC
Output Rated
Current I rated
ADC
Output
Ripple/Noise,
mV p-p
Typical
Eff.@ 75%
I rated, 40C,
48Vi
Model
%
QKS48T21120
35-75
7.5
21
94
12 (NOM.)
120 (NOM.)
Model numbers highlighted in yellow or shaded are not recommended for new designs.
The QKS48T21120 is not recommended for new designs. Please refer to the
QME48T20120 data sheet for a similar product.
.
MCD10089 Rev. 1.1, 8-Oct-08
Page 1 of 9
www.power-one.com
QKS48T21120 DC-DC Bus Converter Data Sheet
Quarter-Brick with 48VDC Input; 12VDC @ 21A Output
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, 100 ms
PC Board Temperature
100
100
125
Operating Temperature
Storage Temperature
-40
-40
°C
Environmental and Mechanical Specifications
All specifications apply over specified input voltage, output load, and temperature range, unless otherwise noted.
Parameter
Operating Humidity
Storage Humidity
Shock
Conditions/Description
Relative Humidity, Non-cond.
Relative Humidity, Non-cond.
(Half-sinewave, 6ms), 3 axes
GR-63-CORE, Section 5.4.2
Min
Nom
Max
95
Units
%
95
%
50
1
g
Sinusoidal Vibration
Weight
g
1.2/35
Yes
1.8
Oz/g
Water Washing
MTBF
Standard process
Per Bellcore TR-NWT-000332
MHrs
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
Input to Output
1500
10
VDC
MOhm
pF
Isolation Resistance
Isolation Capacitance
1000
Input Specifications
All specifications apply over specified input voltage, output load, and temperature range, unless otherwise noted.
Parameter
Conditions/Description
Min
Nom
Max
Units
Input Voltage
Continuous
36
48
75
VDC
Input Undervoltage Lockout
Turn-on Voltage Threshold
Turn-off Voltage Threshold
Hysteresis
33.5
32
1.5
34.5
33
35.5
34
Vin
V
Power up Turn-on delay time
(Time from VIN @ UVLO to Vo @
10% of Vo nominal)
Enable Turn-on delay time
(Time from Venable @ 0.8V to Vo
@ 10% of Vo nominal)
All
All
0.5
0.5
30
11
ms
ms
MCD10089 Rev. 1.1, 8-Oct-08
Page 2 of 9
www.power-one.com
QKS48T21120 DC-DC Bus Converter Data Sheet
Quarter-Brick with 48VDC Input; 12VDC @ 21A Output
Parameter
Conditions/Description
Min
Nom
Max
Units
Output Rise Time at Turn-on
(Time from Vo @ 10% Vo
nominal to Vo @ 90% of Vo
nominal)
All
0.5
30
ms
w/ Load = resistor + 330 µF
capacitor
Turn-on Output Overshoot
Input Reflected Ripple Current
Vo
13.2
200
VDC
mA p-p
Full Load, 12μH source inductance
-
-
Inrush Transient
i2t
2
A2s
Output Specifications
All specifications apply over specified input voltage, output load, and temperature range, unless otherwise noted.
Parameter
Conditions/Description
Min
11
0
Nom
Max
13
Units
VDC
A
Output Voltage Set Point
(Vin = 48V, Iout = ½ full load, 25°C)
Output Current
Vo
Io
11.5
21
Output Ripple
(DC to 20MHz, 25°C)
Output Line regulation
(Vi=36V to 75V, Iout = full load, 25°C)
Output Load regulation
(lout from 0 to full load)
Output Temperature Regulation:
(Tcase =-40°C to +110°C)
Transient Response
Vo
25
3
70
mVp-p
Vo
Vo
Vo
8
mV
mV
500
%/°C
± 0.03
(50% to 75% Load Step, Io/Δt=1A/µs,
with 220µF, ESR<0.07ohm on output
side)
Vo
11
-
-
13
10
V
ms
Peak Deviation
Settling Time (Vo, 1% of Vo)
Admissible Load Capacitance
Output Current Limit Threshold*
Switching Frequency
Irated, Nom Vin
Io
330
110
5000
150
μF
%Irated
kHz
135
350
Overvoltage Protection,
Hiccup, auto recovery
Over all input voltage and load
conditions
14
15
VDC
* Overcurrent protection is non-latching with auto recovery.
MCD10089 Rev. 1.1, 8-Oct-08
Page 3 of 9
www.power-one.com
QKS48T21120 DC-DC Bus Converter Data Sheet
Quarter-Brick with 48VDC Input; 12VDC @ 21A Output
Feature Specifications
All specifications apply over specified input voltage, output load, and temperature range, unless otherwise noted.
Parameter
Min
Nom
Max
Units
Remote On/Off, Primary Side
Positive Logic
Off – State Voltage
On – State Voltage
-0.5
2.5
0.3
40
VDC
VDC
Negative Logic (-N option)
Off – State Voltage
2.5
-0.5
40
0.3
VDC
VDC
VDC
On – State Voltage
Open Circuit Voltage (internal pull up
circuit at On/Off pin)
Sink Current-Logic Low
Thermal Shutdown
(PCB temperature)
Hysteresis (Latching Optional)
5
0.50
mA
+129
20
+137
°C
* Overtemperature protection is auto recovery via hysteresis loop. Optionally, latched overtemperature protection can specified by adding “S1”
in the special options field of the part number (see page 9).
MCD10089 Rev. 1.1, 8-Oct-08
Page 4 of 9
www.power-one.com
QKS48T21120 DC-DC Bus Converter Data Sheet
Quarter-Brick with 48VDC Input; 12VDC @ 21A Output
Shutdown Feature Description
Efficiency Curve
The ON/OFF pin in the QKS48T21120 converter
functions as a normal soft shutdown. It is referenced
to the –Vin pin (see Figure 2). 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
Figure 1. QKS48T21120 Efficiency vs. Output Load
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 2 shows the recommended connections for
the QKS48T21120 converter.
Note:
Fuse
If the ON/OFF pin is not used, it can be left floating (positive logic),
or connected to the -Vin pin (negative logic).
+Vo
+Vi
C1
C3
On/Off
-Vi
-Vo
Figure 2. Typical Application of QKS48T21120
The QKS48T21120 converter does not require any
external components for proper operation. However,
a 100 µF low ESR input capacitor and a 330 µF
output capacitor are recommended for optimal
performance
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.
MCD10089 Rev. 1.1, 8-Oct-08
Page 5 of 9
www.power-one.com
QKS48T21120 DC-DC Bus Converter Data Sheet
Quarter-Brick with 48VDC Input; 12VDC @ 21A Output
Safety Considerations
The QKS48T21120 converter features 1500 Volt DC
isolation from input to output. The input-to-output
resistance is greater than 10 MΩ. This converter is
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 QKS48T21120 converter has no internal fuse.
The external fuse must be provided to protect the
system from catastrophic failure. The fuse with a
rating not greater than 10A 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 QKS48T21120
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
QKS48T21120 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.
MCD10089 Rev. 1.1, 8-Oct-08
Page 6 of 9
www.power-one.com
QKS48T21120 DC-DC Bus Converter Data Sheet
Quarter-Brick with 48VDC Input; 12VDC @ 21A Output
term operation of the converter. Contact Power-One
for a complete list of the derating criteria.
Thermal Considerations
The graph in figure 3 shows the maximum output
The QKS48T21120 converter is designed for natural
or forced-convection cooling. The maximum
current of the QKS48T21120 converter at different
ambient temperatures under both natural and forced
convection.
allowable output current of the converter is
determined by meeting the derating criteria for all
components used in the converter. For example, the
maximum semiconductor junction temperature is not
allowed to exceed 125 °C to ensure reliable long-
For example, the QKS48T21120 operating at 70 °C
can deliver up to 15.7A reliably with 200 LFM forced
air.
THERMAL DERATING CURVE
QKS48T21120-NCA0
Vin = 48V, Orientation : Vin- to Vin +
Data Rev: 01
24
20
16
12
8
4
NC (25 - 35 LFM)
100 LFM
40
200 LFM
300 LFM
55
400 LFM
0
25
70
85
Ambient Temperature (Deg C)
Figure 3. QKS48T21120 Derating Curves
MCD10089 Rev. 1.1, 8-Oct-08
Page 7 of 9
www.power-one.com
QKS48T21120 DC-DC Bus Converter Data Sheet
Quarter-Brick with 48VDC Input; 12VDC @ 21A Output
Mechanical Drawing
MCD10089 Rev. 1.1, 8-Oct-08
Page 8 of 9
www.power-one.com
QKS48T21120 DC-DC Bus Converter Data Sheet
Quarter-Brick with 48VDC Input; 12VDC @ 21A Output
Converter Part Numbering Ordering Information
Series
# Out
Vin nom.
I/O type
Io
Vo
(nom. X 10)
120
-
On/Off Height
logic
Pin
length options
A, B, C
Special
QK
1/4-
Brick,
S
48
T
21
ADC
-
P, N
C
0
Single
output
35 – 75Vdc
Thru-hole
VDC
See table below
Features & Options1
Descriptions:
Suffix code:
Remote ON/OFF
Positive logic
Negative logic
0.50” nom. (fixed value, no alternative height)
0.18” (standard model length)
0.145”
-Pxxx
-Nxxx
-xCxx
-xxAx
-xxBx
-xxCx
-xxx0
Unit Height
Pin Length
0.110”
Special Options 1
None (standard model, no special options)
Latched Thermal Shutdown Protection
Customer-specific models
-xxxS1
-xxxS#
RoHS
Add to Part Number
RoHS lead solder exemption
RoHS compliant for all six substances
No RoHS character required.
Add "G" as the last character of the part number.
Example:
Standard QKS with negative logic & 0.145 pin length; the resulting part number is QKS48T2112–NCB0
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.
MCD10089 Rev. 1.1, 8-Oct-08
Page 9 of 9
www.power-one.com
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