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Data Sheet March 27, 2008
QBK025A0B Series DC-DC Converter Power Modules: 36- 55Vdc Input, 12Vdc Output and 25A Output Current RoHS Compliant
Features
Compliant to RoHS EU Directive 2002/95/EC (-Z versions) Compliant to RoHS EU Directive 2002/95/EC with lead solder exemption (non-Z versions) Delivers up to 25A Output current High efficiency - 94% at 12V full load Industry standard Quarter brick footprint 57.9mm x 36.8mm x 10.6mm (2.28in x 1.45in x 0.42in) Low output ripple and noise
Applications
Distributed power architectures Servers and storage applications Optical and Access Network Equipment Enterprise Networks
Cost efficient open frame design Intermediate input voltage range Output overcurrent/voltage protection Over-temperature protection Single optimal regulated output Wide operating temperature range (-400C to 850C) Positive logic, Remote On/Off
Options
Negative logic, Remote On/Off Active load sharing (Parallel Operation) Baseplate option (-H) Auto restart after fault shutdown Case ground pin
Complies with and is licensed for Basic Insulation rating per EN60950-1 CE mark meets 73/23/EEC and 93/68/EEC directives UL* 60950-1Recognized, CSA C22.2 No. 60950-103 Certified, and VDE 0805:2001-12 (EN60950-1) Licensed ISO** 9001 and ISO 14001 certified manufacturing facilities
Description
The QBK025A0B series of DC-DC converters are an expansion of a new generation of DC/DC power modules designed to support 12Vdc intermediate bus applications where multiple low voltages are subsequently generated using discrete/modular point of load (POL) converters. The QBK025A0B series provide up to 25A output current in an industry standard quarter brick, which makes it an ideal choice for small space, high current and 12V intermediate bus voltage applications. The converter incorporates synchronous rectification technology and innovative packaging techniques to achieve efficiency reaching 94% at 12V full load. This leads to lower power dissipations such that for many applications a heat sink is not required. The output is fully isolated from the input, allowing versatile polarity configurations and grounding connections. Built-in filtering for both input and output minimizes the need for external filtering.
* UL is a registered trademark of Underwriters Laboratories, Inc.

CSA is a registered trademark of Canadian Standards Association. VDE is a trademark of Verband Deutscher Elektrotechniker e.V. ** ISO is a registered trademark of the International Organization of Standards
Document No: DS03-096 ver. 1.46 PDF name: qbus_qbk025a0b_ds.pdf
Data Sheet March 27, 2008
QBK025A0B DC-DC Power Modules: 36-55Vdc Input; 12Vdc Output Voltage; 25A Output Current
Absolute Maximum Ratings
Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are absolute stress ratings only, functional operation of the device is not implied at these or any other conditions in excess of those given in the operations sections of the data sheet. Exposure to absolute maximum ratings for extended periods can adversely affect the device reliability.
Parameter Input Voltage* Continuous Non- operating continuous Operating Ambient Temperature (See Thermal Considerations section) Storage Temperature All Tstg -55 125 C Vdc I/O Isolation Voltage (100% factory Hi-Pot tested) All 1500 * Input over voltage protection will shutdown the output voltage when the input voltage exceeds threshold level. All VIN VIN TA -0.3 -0.3 -40 55 75 85 Vdc Vdc C Device Symbol Min Max Unit
Electrical Specifications
Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature conditions.
Parameter Operating Input Voltage Maximum Input Current (VIN=0V to 55V, IO=IO, max) Inrush Transient Input Reflected Ripple Current, peak-to-peak (5Hz to 20MHz, 12H source impedance; VIN= 48V, IO= IOmax ; see Figure 9) Input Ripple Rejection (120Hz) All All All It
2
Device
Symbol VIN IIN,max
Min 36 -
Typ 48 -
Max 55 9.5
Unit Vdc Adc
-
24 -50
1 -
As mAp-p dB
2
CAUTION: This power module is not internally fused. An input line fuse must always be used.
This power module can be used in a wide variety of applications, ranging from simple standalone operation to an integrated part of a sophisticated power architecture. To preserve maximum flexibility, internal fusing is not included, however, to achieve maximum safety and system protection, always use an input line fuse. The safety agencies require a fast-acting fuse with a maximum rating of 15A (see Safety Considerations section). Based on the information provided in this data sheet on inrush energy and maximum dc input current, the same type of fuse with a lower rating can be used. Refer to the fuse manufacturer's data sheet for further information.
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Data Sheet March 27, 2008
QBK025A0B DC-DC Power Modules: 36-55Vdc Input; 12Vdc Output Voltage; 25A Output Current
Electrical Specifications (continued)
Parameter Output Voltage Set-point (VIN=VIN,nom, IO=15A, Ta =25C) Output Voltage (Over all operating input voltage, resistive load, and temperature conditions until end of life) Output Regulation Line (VIN = VIN, min to VIN, max) Load (IO = IO, min to IO, max) Temperature (Tref =TA, min to TA, max) Output Ripple and Noise on nominal output (VIN =VIN, nom and IO = IO, min to IO, max, RMS (5Hz to 20MHz bandwidth) Peak-to-Peak (5Hz to 20MHz bandwidth) External Capacitance Output Current Output Current Limit Inception (Hiccup Mode) (Vo = 90% Vo, set ) Efficiency VIN= 48V, TA=25C, IO= IO, max Switching Frequency Dynamic Load Response (dIO/dt=0.1A/s; VIN=VIN, nom; TA=25C) Load change from IO = 50% to 75% of IO, max Peak Deviation Settling Time (VO<10% peak deviation) Load change from IO = 50% to 25% of IO, max, Peak Deviation Settling Time (VO<10% peak deviation) 12V Vpk ts 2 200 % VO s 12V Vpk ts 2 200 % VO s All All All 12V 12V 12V CO, max Io IO, lim fsw 0 __ 28.5 94 300 70 200 10,000 25 mVrms mVpk-pk F Adc Adc % KHz All All All VO 11.4 12.6 Vdc Device 12 Symbol VO, set Min Typ 12 Max Unit Vdc

0.2 3 150

%Vo %Vo mV
Isolation Specifications
Parameter Isolation Capacitance Isolation Resistance Symbol Ciso Riso Min 10 Typ 2000 Max Unit pF M
General Specifications
Parameter Calculated MTBF (IO=80% of IO, max, TA=25C, airflow=1m/s(200LFM)) Weight Min Typ 2,600,000 44 (1.55) Max Unit Hours g (oz.)
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Data Sheet March 27, 2008
QBK025A0B DC-DC Power Modules: 36-55Vdc Input; 12Vdc Output Voltage; 25A Output Current
Feature Specifications
Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature conditions. See Feature Descriptions for additional information.
Parameter Remote On/Off Signal Interface (VIN=VIN, min to VIN, max , Signal referenced to VINterminal) Negative Logic: Device code suffix "1" Logic Low = module On, Logic High = module Off Positive Logic: No device code suffix required Logic Low = module Off, Logic High = module On On/Off Thresholds: Remote On/Off Current - Logic Low Logic Low Voltage Logic High Voltage - (Typ = Open Collector) Logic High maximum allowable leakage current (Von/off = 2.0V) Maximum voltage allowed on On/Off pin Turn-On Delay and Rise Times (IO= IO, max , VIN=VIN, nom, TA = 25 C) Case 1: Time until VO = 10% of VO,set from application of Vin with Remote On/Off set to On Case 2: Time until VO = 10% of VO,set from operation of Remote On/Off from Off to On with Vin already applied for at least one second. Output Voltage Rise time (time for Vo to rise from 10% of Vo, set to 90% of Vo, set) Over Temperature Protection (See Thermal Considerations section) Input Under Voltage Lockout Turn-on Threshold Turn-off Threshold Over Voltage Protection 12V VUVLO 32 13 35 34 36 15 V V V All 12 Tdelay
Enable with Vin o
Device
Symbol
Min
Typ
Max
Unit
All All All All All
Ion/off Von/off Von/off Ion/off Von/off
5 0.0 2.0
10
15 0.8 5.0 6.0 14.0
A V V A V

15 1.5

msec msec
Tdelay
Enable with on/off
Trise Tref

1 125

msec C
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Data Sheet March 27, 2008
QBK025A0B DC-DC Power Modules: 36-55Vdc Input; 12Vdc Output Voltage; 25A Output Current
Characteristic Curves
The following figures provide typical characteristics for QBK025A0B (12V, 25A) at 25C. The figures are identical for either positive or negative Remote On/Off logic.
On/Off VOLTAGE OUTPUT VOLTAGE
10 9
INPUT CURRENT, Ii (A)
8 7 6 5 4 3 2 1 0 30 35 40 45 50 55 Io=12.5A Io=0A Io=25A
VON/OFF(V) (2V/div)
VO (V) (5V/div)
INPUT VOLTAGE, VO (V)
TIME, t (500 s/div)
Figure 1. Typical Input Characteristic at Room Temperature.
100 95 90 Vin=48V 85 80 75 70 0 5 10 15 20 25 Vin=36V Vin=55V
Figure 4. Typical Start-Up Using Remote On/Off, negative logic version shown.
OUTPUT CURRENT, OUTPUT VOLTAGE VO (V) (500mV/div) IO (A) (5A/div)
EFFCIENCY, (%)
OUTPUT CURRENT, IO (A)
TIME, t (200 s/div)
Figure 2. Typical Converter Efficiency Vs. Output current at Room Temperature.
Figure 5. Typical Transient Response to Step change in Load from 25% to 50% to 25% of Full Load at Room Temperature and 48 Vdc Input.
OUTPUT CURRENT, OUTPUT VOLTAGE VO (V) (500mV/div) IO (A) (5A/div)
OUTPUT VOLTAGE,
36 Vin
VO (V) (100mV/div)
48 Vin
55 Vin
TIME, t (1s/div)
TIME, t (200 s/div)
Figure 3. Typical Output Ripple and Noise at Room Temperature and Io = Io,max .
Figure 6. Typical Transient Response to Step Change in Load from 50% to 75% to 50% of Full Load at Room Temperature and 48 Vdc Input.
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Data Sheet March 27, 2008
QBK025A0B DC-DC Power Modules: 36-55Vdc Input; 12Vdc Output Voltage; 25A Output Current
Characteristic Curves (continued)
12.3
OUTPUT VOLTAGE, VO (V)
12.2 12.1 12 11.9 11.8 11.7 36 41 46 51 56 Io=12.5A Io=0A
Io=25A
INPUT VOLTAGE, Vin (V)
Figure 7. Typical Output voltage regulation vs. Input voltage at Room Temperature.
12.2
OUTPUT VOLTAGE, VO (V)
12.1
12
Vin=55V
11.9 Vin=48V 11.8 Vin=36V
11.7 0 5 10 15 20 25
OUTPUT CURRENT, IO (A)
Figure 8. Typical Output voltage regulation Vs. Output current at Room Temperature.
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Data Sheet March 27, 2008
QBK025A0B DC-DC Power Modules: 36-55Vdc Input; 12Vdc Output Voltage; 25A Output Current
Test Configurations
Design Considerations
Input Source Impedance
The power module should be connected to a low ac-impedance source. A highly inductive source impedance can affect the stability of the power module. For the test configuration in Figure 9, a 100F electrolytic capacitor (ESR<0.7 at 100kHz), mounted close to the power module helps ensure the stability of the unit. Consult the factory for further application guidelines.
Note: Measure input reflected-ripple current with a simulated source inductance (LTEST) of 12 H. Capacitor CS offsets possible battery impedance. Measure current as shown above.
Safety Considerations
For safety-agency approval of the system in which the power module is used, the power module must be installed in compliance with the spacing and separation requirements of the end-use safety agency standard, i.e., UL 1950, CSA C22.2 No. 60950-00, rd and VDE 0805:2001-12 (IEC60950 3 Ed). If the input source is non-SELV, for the module's output to be considered as meeting the requirements for safety extra-low voltage (SELV), all of the following must be true: The input source is to be provided with reinforced insulation from any other hazardous voltages, including the ac mains. One VIN pin and one VOUT pin are to be grounded, or both the input and output pins are to be kept floating. The input pins of the module are not operator accessible. Another SELV reliability test is conducted on the whole system (combination of supply source and subject module), as required by the safety agencies, to verify that under a single fault, hazardous voltages do not appear at the module's output. Note: Do not ground either of the input pins of the module without grounding one of the output pins. This may allow a non-SELV voltage to appear between the output pins and ground. The power module has extra-low voltage (ELV) outputs when all inputs are ELV. The input to these units is to be provided with a maximum 15 A fast-acting (or time-delay) fuse in the unearthed lead.
Figure 9. Input Reflected Ripple Current Test Setup.
Note: Use a 1.0 F ceramic capacitor and a 10 F aluminum or tantalum capacitor. Scope measurement should be made using a BNC socket. Position the load between 51 mm and 76 mm (2 in. and 3 in.) from the module.
Figure 10. Output Ripple and Noise Test Setup.
CONT ACT AND DISTRIBUTION LOSSES VI(+) II SUPPL Y VI(-) CONT ACT RESIST ANCE VO2 VO1 IO LO AD
Note: All measurements are taken at the module terminals. When socketing, place Kelvin connections at module terminals to avoid measurement errors due to socket contact resistance.
Figure 11. Output Voltage and Efficiency Test Setup.
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Data Sheet March 27, 2008
QBK025A0B DC-DC Power Modules: 36-55Vdc Input; 12Vdc Output Voltage; 25A Output Current
will continue indefinitely until the over current condition is corrected. An auto-restart option is also available. An auto-restart feature continually attempts to restore the operation until fault condition is cleared.
Feature Description
Remote On/Off
Two remote on/off options are available. Positive logic remote on/off turns the module on during a logic-high voltage on the ON/OFF pin, and off during a logic low. Negative logic remote on/off turns the module off during a logic high and on during a logic low. Negative logic, device code suffix "1," is the factory-preferred configuration. The on/off circuit is powered from an internal bias supply. To turn the power module on and off, the user must supply a switch to control the voltage between the on/off terminal and the Vi (-) terminal (Von/off). The switch can be an open collector or equivalent (see Figure 12). A logic low is Von/off = 0.0V to 0.8V. The typical Ion/off during a logic low is 10 A. The switch should maintain a logiclow voltage while sinking 10A. During a logic high, the maximum Von/off generated by the power module is 5.0V. The maximum allowable leakage current of the switch at Von/off = 2.0V is 6.0A. If using an external voltage source, the maximum voltage V on/off on the pin is 14.0V with respect to the Vi (-) terminal. If not using the remote on/off feature, perform one of the following to turn the unit on: For negative logic, short ON/OFF pin to VI(-). For positive logic: leave ON/OFF pin open.
Ion/off + Von/off - VO(+) LOAD VI(+) VI(-) VO(-) ON/OFF
Input Under/Over Voltage Lockout
At input voltages above or below the input under/over voltage lockout limits, module operation is disabled. The module will begin to operate when the input voltage level changes to within the under and overvoltage lockout limits.
Over Temperature Protection
These modules feature an over temperature protection circuit to safeguard against thermal damage. The circuit shuts down and latches off the module when the maximum device reference temperature is exceeded. The module can be restarted by cycling the dc input power for at least one second or by toggling the remote on/off signal for at least one second.
Output Over Voltage Clamp
The output overvoltage clamp consists of a control circuit, independent of the primary regulation loop, that monitors the voltage on the output terminals and clamps the voltage when it exceeds the overvoltage set point. The control loop of the clamp has a higher voltage set point than the primary loop. This provides a redundant voltage control that reduces the risk of output overvoltage.
Figure 10. Circuit configuration for using Remote On/Off Implementation.
Over Current Protection
To provide protection in a fault output overload condition, the module is equipped with internal current-limiting circuitry and can endure current limiting for a few mili-seconds. If the over current condition persists beyond a few milliseconds, the module will shut down and remain latched off. The over current latch is reset by either cycling the input power or by toggling the on/off pin for one second. If the output overload condition still exists when the module restarts, it will shut down again. This operation
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Data Sheet March 27, 2008
QBK025A0B DC-DC Power Modules: 36-55Vdc Input; 12Vdc Output Voltage; 25A Output Current
module can shutdown without causing the total load to exceed the capability of the remaining operating module(s). The shutdown module can then automatically restart, and assume its share of the total load. * In all parallel applications (including applications meeting the [n-1] sizing criteria discussed earlier), if it is expected that a protective shutdown event could cause more than one parallel module to shutdown (for example, over temperature due to a common fan failure, or gross over current affecting two or more modules simultaneously), then the use of the auto-restart (4) option is not recommended. The auto-restart interval of these modules is not synchronized to other modules, nor is it precise. There will not be a successful restart following multiple module shutdowns, because the individual module's restart timings will be different. There will not be sufficient module capacity to prevent the first module which restarts from experiencing an over current, and then again shutting down before the slowest module has restarted. Meanwhile, the slowest module will then restart, and then shutdown during the interval the fastest module is waiting for its next restart. And so on and so on. In these cases, only latching shutdown modules should be used; and either toggling the Vin source or the on/off pin to simultaneously restart the modules, following a shutdown, is advised.
Feature Description (continued)
Forced Load Sharing (Parallel Operation with - P option)
For additional power requirements, the power module can be configured for parallel operation with active load current sharing. Good layout techniques should be observed for noise immunity when using multiple modules in parallel. To implement active load sharing, the following recommendations must be followed: * The parallel pins of all units in parallel must be connected together. The path of these connections should be as direct as possible, but should not pass beneath the perimeter of the module body, except immediately adjacent to the parallel pin location. Parallel modules must use the same 48V source. The VIN (-) input pin is the return path for the active current share signal of the parallel pin. Separate 48V sources will prevent the active current share return signal from being connected to other modules. The VIN (-) input connection should never be disconnected from any of the parallel modules, while another of the parallel modules is operating, unless the VIN (+) pin, or the parallel pin is also disconnected. The VIN (-) input provides the internal logic ground and for the module's primary circuits, including the active current share circuit; and there are sneak paths through the module's internal control ICs, when the VIN (-) pin is disconnected (allowing the internal logic circuit to float), while the parallel pin and VIN (+) pin are connected to other operating modules. These sneak paths do not cause permanent damage, but do create false conditions that can affect the module's internal logic configuration. The on/off pins of all modules should also be tied together to the same external control circuitry, so that the modules are turned on and off at the same time, unless all parallel modules' on/off pins are tied to the input pins for automatic start upon application of input voltage. When modules in parallel applications contain the auto-restart (4) option, it is required that the total maximum load current value be less than 90% of [n-1] times the individual module output current rating, where n is the number of modules in parallel. For example, if the application is using three modules rated at 25A, then the maximum total load shall be less than 0.9 x (3-1) x 25A = 0.9 x 2 x 25A = 45A. This insures that a single
*
*
When not using the parallel feature, leave the share pin open.
*
*
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Data Sheet March 27, 2008
QBK025A0B DC-DC Power Modules: 36-55Vdc Input; 12Vdc Output Voltage; 25A Output Current
Heat Transfer via Convection
Increased airflow over the module enhances the heat transfer via convection. The thermal derating figures (14-16) show the maximum output current that can be delivered by each module in the respective orientation without exceeding the maximum TH temperature versus local ambient temperature (TA) for air flows of 1 m/s (200 ft./min) and 2m/s (400 ft./min). Note that the natural convection condition was measured at 0.05 m/s to 0.1 m/s (10ft./min. to 20 ft./min.); however, systems in which these power modules may be used typically generate natural convection airflow rates of 0.3 m/s (60 ft./min.) due to other heat dissipating components in the system. The use of Figures 14 - 15 are shown in the following example: Example What is the minimum airflow necessary for a QBK025A0B operating at VI = 48 V, an output current of 12A, and a maximum ambient temperature of 70 C in transverse orientation. Solution: Given: VI = 48V, Io = 12A, TA = 70 C Determine required airflow (V) (Use Figure 14): V = T1 m/sec. ( 200 ft./min.) or greater. OUTPUT CURRENT, IO (A)
30 25 20 15 10 5
Natural Convection 3m/s (600LFM) 2m/s (400LFM) 1m/s (200LFM)
Thermal Considerations
The power modules operate in a variety of thermal environments and sufficient cooling should be provided to help ensure reliable operation. Thermal considerations include ambient temperature, airflow, module power dissipation, and the need for increased reliability. A reduction in the operating temperature of the module will result in an increase in reliability. The thermal data presented here is based on physical measurements taken in a wind tunnel. Heat-dissipating components are mounted on the top side of the module. Heat is removed by conduction, convection and radiation to the surrounding environment. Proper cooling can be verified by measuring the thermal reference temperature (TH). Peak temperature (TH) occurs at the position indicated in Figure 13. For reliable operation this temperature should not exceed the listed temperature threshold.
Figure 13. Location of the thermal reference temperature TH. The output power of the module should not exceed the rated power for the module as listed in the Ordering Information table. Although the maximum TH temperature of the power modules is 110 C - 115 C, you can limit this temperature to a lower value for extremely high reliability. Please refer to the Application Note "Thermal Characterization Process For Open-Frame BoardMounted Power Modules" for a detailed discussion of thermal aspects including maximum device temperatures.
0 0 20 40 60 80 100
LOCAL AMBIENT TEMPERATURE, TA (C) Figure 14. Output Current Derating for the QBK025A0B in the Transverse Orientation with no baseplate; Airflow Direction from Vin(+) to Vin(-); Vin = 48V.
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Data Sheet March 27, 2008
QBK025A0B DC-DC Power Modules: 36-55Vdc Input; 12Vdc Output Voltage; 25A Output Current
Thermal Derating Curves
30
OUTPUT CURRENT, IO (A)
25 20 15
3m/s (600LFM)
10 5
2m/s (400LFM) 1m/s (200LFM) Natural Convection
0 0 20 40 60 80 100
LOCAL AMBIENT TEMPERATURE, TA (C) Figure 15. Output Current Derating for the QBK025A0B (Vo = 12V) in the Transverse Orientation with baseplate.
30
OUTPUT CURRENT, IO (A)
25 20 15
3m/s (600LFM)
10 5 0 0 20
2m/s (400LFM) 1m/s (200LFM)
40
60
80
100
LOCAL AMBIENT TEMPERATURE, TA (C) Figure 16. Output Current Derating for the QBK025A0B (Vo = 12V) in the Transverse Orientation with baseplate and 0.25-inch high heatsink.
30
OUTPUT CURRENT, IO (A)
25 20 15
3m/s (600LFM)
10 5 0 0 20 40
2m/s (400LFM) 1m/s (200LFM)
60
80
100
LOCAL AMBIENT TEMPERATURE, TA (C) Figure 17. Output Current Derating for the QBK025A0B (Vo = 12V) in the Transverse Orientation with baseplate and 0.5-inch high heatsink.
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Data Sheet March 27, 2008
QBK025A0B DC-DC Power Modules: 36-55Vdc Input; 12Vdc Output Voltage; 25A Output Current
Layout Considerations
The QBK025 power module series are low profile in order to be used in fine pitch system card architectures. As such, component clearance between the bottom of the power module and the mounting board is limited. Avoid placing copper areas on the outer layer directly underneath the power module. Also avoid placing via interconnects underneath the power module. For additional layout guide-lines, refer to FLTR100V10 data sheet.
Through-Hole Lead-Free Soldering Information
The RoHS-compliant through-hole products use the SAC (Sn/Ag/Cu) Pb-free solder and RoHS-compliant components. They are designed to be processed through single or dual wave soldering machines. The pins have an RoHS-compliant finish that is compatible with both Pb and Pb-free wave soldering processes. A maximum preheat rate of 3C/s is suggested. The wave preheat process should be such that the temperature of the power module board is kept below 210C. For Pb solder, the recommended pot temperature is 260C, while the Pb-free solder pot is 270C max. Not all RoHS-compliant through-hole products can be processed with paste-through-hole Pb or Pb-free reflow process. If additional information is needed, please consult with your Lineage Power representative for more details.
Post Solder Cleaning and Drying Considerations
Post solder cleaning is usually the final circuit-board assembly process prior to electrical board testing. The result of inadequate cleaning and drying can affect both the reliability of a power module and the testability of the finished circuit-board assembly. For guidance on appropriate soldering, cleaning and drying procedures, refer to Lineage Power Board Mounted Power Modules: Soldering and Cleaning Application Note (AP01-056EPS).
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Data Sheet March 27, 2008
QBK025A0B DC-DC Power Modules: 36-55Vdc Input; 12Vdc Output Voltage; 25A Output Current
Mechanical Outline
Dimensions are in millimeters and (inches). Tolerances: x.x mm 0.5 mm (x.xx in. 0.02 in.) [Unless otherwise indicated] x.xx mm 0.25 mm (x.xxx in 0.010 in.) TOP VIEW
36.8 (1.45)
57.9 (2.28)
SIDE VIEW
4.6 MIN (.18) 3.6 (.14) 7.62 (.300) 3.81 (.150) VI(-) 11.43 CASE (.450) 15.24 ON/OFF (.600)
PARALLEL
10.5 (.41) 0.25 MIN (.010) 2.36 (.093) DIA SOLDER-PLATED PIN SHOULDER, 2 PLCS 1.57 (.062) DIA SOLDER-PLATED PIN, 2 PLCS
1.57 (.062) DIA SOLDER PLATED PIN SHOULDER, 5 PLCS 1.02 (.040) DIA SOLDER PLATED PIN, 5 PLCS 50.8 (2.000)
10.8 (.43) VO(-) 15.24 (.600)
BOTTOM VIEW
VI(+)
VO(+)
*Top side label includes Lineage Power name, product designation, and data code. Option Feature, Pin is not present unless one these options specified.
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Data Sheet March 27, 2008
QBK025A0B DC-DC Power Modules: 36-55Vdc Input; 12Vdc Output Voltage; 25A Output Current
Mechanical Outline for module with base plate.
Dimensions are in millimeters and [inches]. Tolerances: x.x mm 0.5 mm [x.xx in. 0.02 in.] (Unless otherwise indicated) x.xx mm 0.25 mm [x.xxx in 0.010 in.] TOP VIEW
SIDE VIEW
BOTTOM VIEW
*Bottom side label includes Lineage Power name, product designation, and data code. Option Feature, Pin is not present unless one these options specified.
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Data Sheet March 27, 2008
QBK025A0B DC-DC Power Modules: 36-55Vdc Input; 12Vdc Output Voltage; 25A Output Current
Recommended Pad Layout
Dimensions are in millimeters and (inches). Tolerances: x.x mm 0.5 mm (x.xx in. 0.02 in.) [Unless otherwise indicated] x.xx mm 0.25 mm (x.xxx in 0.010 in.)
3.6 (.14)
50.80 (2.000)
10.8 (.43) VI(+) PARALLEL 36.8 (1.45) ON/OFF CASE VI (-) 1.02 (.040) DIA PIN, 5 PLCS 1.57 (.062) DIA PIN, 2 PLCS 57.9 (2.28) Vo (-) 15.24 (.600) Vo (+)
Option Feature, Pin is not present unless one these options specified.
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Data Sheet March 27, 2008
QBK025A0B DC-DC Power Modules: 36-55Vdc Input; 12Vdc Output Voltage; 25A Output Current
Ordering Information
Please contact your Lineage Power Sales Representative for pricing, availability and optional features. Table 1. Device Code Input Voltage 48V (36-55Vdc) 48V (36-55Vdc) 48V (36-55Vdc) 48V (36-55Vdc) 48V (36-55Vdc) 48V (36-55Vdc) 48V (36-55Vdc) 48V (36-55Vdc) 48V (36-55Vdc) 48V (36-55Vdc) 48V (36-55Vdc) Output Voltage 12V 12V 12V 12V 12V 12V 12V 12V 12V 12V 12V Output Current 25A 25A 25A 25A 25A 25A 25A 25A 25A 25A 25A Efficiency 94% 94% 94% 94% 94% 94% 94% 94% 94% 94% 94% Connector Type Through hole Through hole Through hole Through hole Through hole Through hole Through hole Through hole Through hole Through hole Through hole Product codes QBK025A0B1 QBK025A0B1-H QBK025A0B741-BH QBK025A0B41-BH QBK025A0B41-PH QBK025A0B71-BPH QBK025A0B741-BPH QBK025A0B1Z QBK025A0B41-BHZ QBK025A0B1-PHZ QBK025A0B71-BHZ Comcode 108988663 108988671 108989471 CC109125151 108992855 CC109104015 108989348 CC109107884 CC109129243 CC109138541 CC109139465
Table 2. Device Options Option Negative remote on/off logic Auto-restart Pin Length: 3.68 mm 0.25 mm (0.145 in. 0.010 in) Case ground pin (offered with baseplate option only) Base Plate option Active load sharing (Parallel Operation) Indicates RoHS Compliant part Suffix 1 4 6 7 -H -P -Z
Note: Legacy device codes may contain a -B option suffix to indicate 100% factory Hi-Pot tested to the isolation voltage specified in the Absolute Maximum Ratings table. The 100% Hi-Pot test is now applied to all device codes, with or without the -B option suffix. Existing comcodes for devices with the -B suffix are still valid; however, no new comcodes for devices containing the -B suffix will be created.
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World Wide Headquarters Lineage Power Corporation 3000 Skyline Drive, Mesquite, TX 75149, USA +1-800-526-7819 (Outside U.S.A.: +1-972-284-2626) www.lineagepower.com e-mail: techsupport1@lineagepower.com
Lineage Power reserves the right to make changes to the product(s) or information contained herein without notice. No liability is assumed as a result of their use or application. No rights under any patent accompany the sale of any such product(s) or information. (c) 2008 Lineage Power Corporation, (Mesquite, Texas) All International Rights Reserved.
Document No: DS03-096 ver. 1.46 PDF name: qbus_qbk025a0b_ds.pdf

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