LINEAGEPOWER JBW050A1

Data Sheet
March 27, 2008
JBW050A Power Modules: dc-dc Converter;
36 to 75 Vdc Input, 5 Vdc Output; 50 W
Features
n
The JBW050A Power Module use advanced, surface-mount
technology and deliver high-quality, efficient, and compact
dc-dc conversion.
Applications
Small size: 61.0 mm x 57.9 mm x 12.7 mm
(2.40 in. x 2.28 in. x 0.50 in.)
n
High power density
n
High efficiency: 84% typical
n
Low output noise
n
Constant frequency
n
Industry-standard pinout
n
Metal case
n
2:1 input voltage range
n
Overtemperature protection
n
Overcurrent and overvoltage protection
n
Remote sense
n
Distributed power architectures
n
Remote on/off
n
Workstations
n
Adjustable output voltage: 60% to 110% of VO, nom
n
Computer equipment
n
Case ground pin
n
Communications equipment
n
ISO9001 Certified manufacturing facilities
n
Options
n
Heat sinks available for extended operation
n
Choice of remote on/off logic configuration
n
Approved for basic insulation (-B suffix)
n
Short Pins
n
UL* 60950 Recognized, CSA † C22.2 No. 6095000 Certified, and EN 60950 (VDE0805):2001-12
Licensed
CE mark meets 73/23/EEC and 93/68/EEC
directives‡
* UL is a registered trademark of Underwriters Laboratories, Inc.
† CSA is a registered trademark of Canadian Standards Assn.
‡ This product is intended for integration into end-use equipment.
All the required procedures for CE marking of end-use equipment should be followed. (The CE mark is placed on selected
products.)
Description
The JBW050A Power Module is a dc-dc converter that operates over an input voltage range of 36 Vdc to 75
Vdc and provides a precisely regulated 5 Vdc output. The output is fully isolated from the input, allowing a
versatile polarity configuration and grounding connections. The module has a maximum power rating of 50 W
at a typical full-load efficiency of 84%.
The modules are DC board-mountable and encapsulated in metal cases. Threaded-through holes are provided to
allow easy mounting or addition of a heat sink for high-temperature applications. The standard feature set
includes remote sensing, output trim, and remote on/off for convenient flexibility in distributed power applications.
JBW050A Power Modules: dc-dc Converter;
36 to 75 Vdc Input, 5 Vdc Output; 50 W
Data Sheet
March 27, 2008
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 device reliability.
Parameter
Symbol
Min
Max
Unit
Input Voltage:
Continuous:
Transient (100 ms)
VI
VI, trans
—
—
75
100
Vdc
V
I/O Isolation Voltage
—
—
1500
Vdc
Operating Case Temperature
(See Thermal Considerations section.)
TC
–40
100
°C
Storage Temperature
Tstg
–55
125
°C
Electrical Specifications
Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature
conditions.
Table 1. Input Specifications
Parameter
Operating Input Voltage
Maximum Input Current
(VI = 0 V to 75 V; IO = IO, max):
JBW050A (See Figure 1.)
Symbol
Min
Typ
Max
Unit
VI
36
48
75
Vdc
II, max
—
—
1.7
A
Inrush Transient
i 2t
—
—
1.0
A2s
Input Reflected-ripple Current, Peak-to-peak
(5 Hz to 20 MHz, 12 µH source impedance;
see Figure 8.)
II
—
5
—
mAp-p
Input Ripple Rejection (120 Hz)
—
—
60
—
dB
Fusing Considerations
CAUTION: This power module is not internally fused. An input line fuse must always be used.
This encapsulated power module can be used in a wide variety of applications, ranging from simple stand-alone
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 10 A (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 for further information.
2
Lineage Power
JBW050A Power Modules: dc-dc Converter;
36 to 75 Vdc Input, 5 Vdc Output; 50 W
Data Sheet
March 27, 2008
Electrical Specifications (continued)
Table 2. Output Specifications
Parameter
Symbol
Min
Typ
Max
Unit
VO, set
4.92
5.0
5.08
Vdc
VO
4.85
—
5.15
Vdc
Output Regulation:
Line (VI = 36 V to 75 V)
Load (IO = IO, min to IO, max)
Temperature (TC = –40 °C to +100 °C)
—
—
—
—
—
—
0.01
0.05
15
0.1
0.2
50
%VO
%VO
mV
Output Ripple and Noise Voltage
(See Figure 9.):
RMS
Peak-to-peak (5 Hz to 20 MHz)
—
—
—
—
—
—
40
150
mVrms
mVp-p
External Load Capacitance
—
0
—
*
µF
Output Current
(At IO < IO, min, the modules may exceed output
ripple specifications.)
IO
0.5
—
10
A
IO, cli
—
11.2
14†
A
Output Voltage Set Point
(VI = 48 V; IO = IO, max; TC = 25 °C)
Output Voltage
(Over all operating input voltage, resistive load,
and temperature conditions until end of life.
See Figure 10.)
Output Current-limit Inception
(VO = 90% of VO, nom)
Output Short-circuit Current (VO = 250 mV)
—
—
14.5
—
A
Efficiency (VI = 48 V; IO = IO, max; TC = 70 °C)
η
—
84
—
%
Switching Frequency
—
—
330
—
kHz
—
—
—
—
2
500
—
—
%VO,
Dynamic Response
(ΔIO/Δt = 1 A/10 µs, VI = 48 V, TC = 25 °C;
tested with a 10 µF aluminum and a 1.0 µF
ceramic capacitor across the load):
(see Figures 5 and 6)
Load Change from IO = 50% to 75% of IO, max:
Peak Deviation
Settling Time (VO < 10% of peak deviation)
Load Change from IO = 50% to 25% of IO, max:
Peak Deviation
Settling Time (VO < 10% of peak deviation)
set
µs
—
—
—
—
2
500
—
—
%VO,
set
µs
* Consult your sales representative or the factory.
† These are manufacturing test limits. In some situations, results may differ.
Lineage Power
JBW050A Power Modules: dc-dc Converter;
36 to 75 Vdc Input, 5 Vdc Output; 50 W
Data Sheet
March 27, 2008
Electrical Specifications (continued)
Table 3. Isolation Specifications
Min
Typ
Max
Unit
Isolation Capacitance
Parameter
—
2500
—
pF
Isolation Resistance
10
—
—
MΩ
Min
Typ
Max
Unit
General Specifications
Parameter
Calculated MTBF (IO = 80% of IO, max; TC = 40 °C)
Weight
3,210,000
—
—
hr.
100 (3.5)
g (oz.)
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
(VI = 0 V to 75 V; open collector or equivalent compatible;
signal referenced to VI(–) terminal; see Figure 11 and
Feature Descriptions.):
Preferred Logic:
Logic Low—Module On
Logic High—Module Off
Optional Logic:
Logic Low—Module Off
Logic High—Module On Logic Low:
At Ion/off = 1.0 mA
At Von/off = 0.0 V
Logic High:
At Ion/off = 0.0 µA
Leakage Current
Turn-on Time (See Figure 7.)
(IO = 80% of IO, max; VO within ±1% of steady state)
Output Voltage Adjustment (See Feature Descriptions.):
Output Voltage Remote-sense Range
Output Voltage Set-point Adjustment Range (trim)
Output Overvoltage Protection
Overtemperature Protection (shutdown)
4
Symbol
Min
Typ
Max
Unit
Von/off
Ion/off
0
—
—
—
1.2
1.0
V
mA
Von/off
Ion/off
—
—
—
—
—
—
20
15
50
35
V
µA
ms
—
—
—
60
—
—
0.5
110
V
%VO, nom
VO, clamp
5.7
—
7.0
V
TC
—
105
—
°C
Lineage Power
JBW050A Power Modules: dc-dc Converter;
36 to 75 Vdc Input, 5 Vdc Output; 50 W
Data Sheet
March 27, 2008
Characteristic Curves
2
88
1.8
86
1.6
84
EFFICIENCY, η (%)
INPUT CURRENT, II (A)
The following figures provide typical characteristics for the power modules. The figures are identical for both on/off
configurations.
1.4
1.2
1
0.8
0.6
0.4
82
80
78
VI = 36 V
VI = 48 V
VI = 75 V
76
74
72
0.2
70
0
30
35
40
45
50
55
60
INPUT VOLTAGE, VI (V)
65
70
0
75
1
2
3
4
5
6
7
8
9
10
OUTPUT CURRENT, IO (A)
1-0689
1-0691
Figure 1. Typical Input Characteristics at Room
Temperature
Figure 3. Typical Converter Efficiency vs. Output
Current at Room Temperature
5
36 V
4
3
2
1
0
0
2
4
6
8
10
12
14
OUTPUT CURRENT, IO (A)
16
18
20
1-0690
OUTPUT VOLTAGE, VO (V)
(20 mV/div)
OUTPUT VOLTAGE, VO (V)
6
48 V
75 V
Figure 2. Typical Output Characteristics at Room
Temperature
TIME, t (2 µs/div)
1-0692
Figure 4. Typical Output Ripple Voltage at Room
Temperature, IO = Full Load
Lineage Power
JBW050A Power Modules: dc-dc Converter;
36 to 75 Vdc Input, 5 Vdc Output; 50 W
Data Sheet
March 27, 2008
OUTPUT VOLTAGE, VO (V) REMOTE ON/OFF PIN,
(1 V/div)
VON/OFF (V)
OUTPUT VOLTAGE, VO (V) OUTPUT CURRENT, IO (A)
(50 mV/div)
(2 A/div)
Characteristic Curves (continued)
TIME, t (5 ms/div)
1-0695
Note: Tested with a 10 µF aluminum and a 1.0 µF ceramic capacitor
across the load.
TIME, t (100 µs/div)
1-0693
Note: Tested with a 10 µF aluminum and a 1.0 µF ceramic capacitor
across the load.
Figure 5. Typical Transient Response to Step
Decrease in Load from 50% to 25% of
Full Load at Room Temperature and 48 V
Input (Waveform Averaged to Eliminate
Ripple Component.)
Figure 7. Typical Start-Up from Remote On/Off;
IO = IO, max
Test Configurations
TO OSCILLOSCOPE
OUTPUT VOLTAGE, VO (V) OUTPUT CURRENT, IO (A)
(50 mV/div)
(2 A/div)
LTEST
CURRENT
PROBE
VI(+)
12 μH
BATTERY
CS 220 μF
ESR < 0.1 Ω
@ 20 °C, 100 kHz
33 μF
ESR < 0.7 Ω
@ 100 kHz
VI(–)
8-203.l
Note: Measure input reflected-ripple current with a simulated source
inductance (LTEST) of 12 µH. Capacitor CS offsets possible battery impedance. Measure current as shown above.
Figure 8. Input Reflected-Ripple Test Setup
TIME, t (100 µs/div)
1-0694
Note: Tested with a 10 µF aluminum and a 1.0 µF ceramic capacitor
across the load.
Figure 6. Typical Transient Response to Step
Increase in Load from 50% to 75% of Full
Load at Room Temperature and
48 V Input (Waveform Averaged to
Eliminate Ripple Component.)
6
Lineage Power
JBW050A Power Modules: dc-dc Converter;
36 to 75 Vdc Input, 5 Vdc Output; 50 W
Data Sheet
March 27, 2008
Test Configurations (continued)
Design Considerations
Input Source Impedance
COPPER STRIP
VO(+)
1.0 μF
10 μF
SCOPE
RESISTIVE
LOAD
VO(–)
8-513.d
Note: Use a 1.0 µF ceramic capacitor and a 10 µF 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.
VI(+)
CONTACT AND
DISTRIBUTION LOSSES
VO(+)
II
IO
LOAD
SUPPLY
VI(–)
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., UL60950, CSA C22.2 No. 60950-00, and
EN 60950 (VDE0805):2001-12.
Figure 9. Peak-to-Peak Output Noise
Measurement Test Setup
SENSE(+)
The power module should be connected to a low
ac-impedance input source. Highly inductive source
impedances can affect the stability of the power module. For the test configuration in 8, a 33 µF electrolytic
capacitor (ESR < 0.7 Ω at 100 kHz) mounted close to
the power module helps ensure stability of the unit. For
other highly inductive source impedances, consult the
factory for further application guidelines.
If the input source is non-SELV (ELV or a hazardous
voltage greater than 60 Vdc and less than or equal to
75 Vdc), for the module’s output to be considered
meeting the requirements of safety extra-low voltage
(SELV), all of the following must be true:
VO(–)
CONTACT
RESISTANCE
n
SENSE(–)
8-749
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.
n
n
[ V O (+) – V O (–) ]I O
η = ⎛ ------------------------------------------------⎞ x 100
⎝ [ V I (+) – V I (–) ]I I ⎠
%
Figure 10. Output Voltage and Efficiency
Measurement Test Setup
n
The input source is to be provided with reinforced
insulation from any hazardous voltages, including the
ac mains.
One VI pin and one VO 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, as required by the safety agencies, on
the combination of supply source and the subject
module 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 pin 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 10 A fast-acting fuse in the ungrounded lead.
Lineage Power
JBW050A Power Modules: dc-dc Converter;
36 to 75 Vdc Input, 5 Vdc Output; 50 W
Data Sheet
March 27, 2008
Feature Descriptions
Overcurrent Protection
To provide protection in a fault (output overload) condition, the unit is equipped with internal current-limiting
circuitry and can endure current limiting for an unlimited duration. At the point of current-limit inception, the
unit shifts from voltage control to current control. If the
output voltage is pulled very low during a severe fault,
the current-limit circuit can exhibit either foldback or
tailout characteristics (output current decrease or
increase). The unit operates normally once the output
current is brought back into its specified range.
Remote On/Off
Ion/off
+
ON/OFF
Von/off
–
SENSE(+)
VO(+)
LOAD
VI(+)
VI(–)
VO(–)
SENSE(–)
8-720c
Figure 11. Remote On/Off Implementation
Remote Sense
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 (code suffix “1”) is the factory-preferred configuration.
Remote sense minimizes the effects of distribution
losses by regulating the voltage at the remote-sense
connections. The voltage between the remote-sense
pins and the output terminals must not exceed the output voltage sense range given in the Feature Specifications table, i.e.:
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 11). A logic low is Von/off = 0 V to 1.2 V. The
maximum Ion/off during a logic low is 1 mA. The switch
should maintain a logic-low voltage while sinking 1 mA.
The voltage between the VO(+) and VO(–) terminals
must not exceed the minimum value of the output overvoltage protection. This limit includes any increase in
voltage due to remote-sense compensation and output
voltage set-point adjustment (trim). See Figure 12.
During a logic high, the maximum Von/off generated by
the power module is 15 V. The maximum allowable
leakage current of the switch at Von/off = 15 V is 50 µA.
If not using the remote on/off feature, do one of the
following:
n
For negative logic, short ON/OFF pin to VI(–).
n
For positive logic, leave ON/OFF pin open.
[VO(+) – VO(–)] – [SENSE(+) – SENSE(–)] ≤ 0.5 V
If not using the remote-sense feature to regulate the
output at the point of load, then connect SENSE(+) to
VO(+) and SENSE(–) to VO(–) at the module.
Although the output voltage can be increased by both
the remote sense and by the trim, the maximum
increase for the output voltage is not the sum of both.
The maximum increase is the larger of either the
remote sense or the trim. Consult the factory if you
need to increase the output voltage more than the
above limitation.
The amount of power delivered by the module is
defined as the voltage at the output terminals multiplied
by the output current. When using remote sense and
trim, the output voltage of the module can be
increased, which at the same output current would
increase the power output of the module. Care should
be taken to ensure that the maximum output power of
the module remains at or below the maximum rated
power.
8
Lineage Power
JBW050A Power Modules: dc-dc Converter;
36 to 75 Vdc Input, 5 Vdc Output; 50 W
Data Sheet
March 27, 2008
Feature Descriptions (continued)
The voltage between the VO(+) and VO(–) terminals
must not exceed the minimum value of the output overvoltage protection. This limit includes any increase in
voltage due to remote-sense compensation and output
voltage set-point adjustment (trim). See Figure 12.
Remote Sense (continued)
Although the output voltage can be increased by both
the remote sense and by the trim, the maximum
increase for the output voltage is not the sum of both.
The maximum increase is the larger of either the
remote sense or the trim. Consult the factory if you
need to increase the output voltage more than the
above limitation.
SENSE(+)
SENSE(–)
SUPPLY
VI(+)
VO(+)
VI(–)
VO(–)
IO
II
CONTACT
RESISTANCE
LOAD
CONTACT AND
DISTRIBUTION LOSSES
8-651m
Figure 12. Effective Circuit Configuration for
Single-Module Remote-Sense Operation
Output Voltage Set-Point Adjustment (Trim)
Output voltage trim allows the user to increase or
decrease the output voltage set point of a module. This
is accomplished by connecting an external resistor
between the TRIM pin and either the SENSE(+) or
SENSE(–) pins. The trim resistor should be positioned
close to the module.
The amount of power delivered by the module is
defined as the voltage at the output terminals multiplied
by the output current. When using remote sense and
trim, the output voltage of the module can be
increased, which at the same output current would
increase the power output of the module. Care should
be taken to ensure that the maximum output power of
the module remains at or below the maximum rated
power.
VI(+)
ON/OFF
If not using the trim feature, leave the TRIM pin open.
CASE
The test results for this configuration are displayed in
Figure 14. This figure applies to all output voltages.
With an external resistor connected between the TRIM
and SENSE(+) pins (Radj-up), the output voltage set
point (VO, adj) increases (see Figure 15).
The following equation determines the required external-resistor value to obtain a percentage output voltage
change of Δ%.
100 + 2Δ% )⎞
V O ( 100 + Δ% -) – (--------------------------------- kΩ
R adj-up = ⎛ ------------------------------------⎝ 1.225Δ%
⎠
Δ%
The test results for this configuration are displayed in
Figure 16.
VI(–)
TRIM
RLOAD
SENSE(–)
VO(–)
8-748b
Figure 13. Circuit Configuration to Decrease
Output Voltage
ADJUSTMENT RESISTOR VALUE (Ω)
R adj-down
SENSE(+)
Radj-down
With an external resistor between the TRIM and
SENSE(–) pins (Radj-down), the output voltage set point
(VO, adj) decreases (see Figure 13). The following equation determines the required external-resistor value to
obtain a percentage output voltage change of Δ%.
100
= ⎛ ---------- – 2⎞ kΩ
⎝ Δ%
⎠
VO(+)
1M
100k
10k
1k
100
0
10
20
30
40
% CHANGE IN OUTPUT VOLTAGE (Δ%)
8-879
Figure 14. Resistor Selection for Decreased
Output Voltage
Lineage Power
JBW050A Power Modules: dc-dc Converter;
36 to 75 Vdc Input, 5 Vdc Output; 50 W
Data Sheet
March 27, 2008
Feature Descriptions (continued)
Thermal Considerations
Output Voltage Set-Point Adjustment
(Trim) (continued)
Introduction
VI(+)
ON/OFF
The power modules operate in a variety of thermal
environments; however, sufficient cooling should be
provided to help ensure reliable operation of the unit.
Heat-dissipating components inside the unit are thermally coupled to the case. Heat is removed by conduction, convection, and radiation to the surrounding
environment. Proper cooling can be verified by measuring the case temperature. Peak temperature (TC)
occurs at the position indicated in Figure 17.
VO(+)
SENSE(+)
Radj-up
CASE
VI(–)
TRIM
RLOAD
SENSE(–)
VO(–)
38.0 (1.50)
8-715b
Figure 15. Circuit Configuration to Increase
Output Voltage
VI(+)
ADJUSTMENT RESISTOR VALUE (Ω)
10M
38.0
(1.50)
ON/OFF
VO(+)
+ SEN
TRIM
1M
CASE
VI(–)
MEASURE CASE
TEMPERATURE
HERE
– SEN
VO(–)
100k
8-716.f
Note: Top view, pin locations are for reference only.
Measurements shown in millimeters and (inches).
10k
0
2
4
6
8
10
% CHANGE IN OUTPUT VOLTAGE (Δ%)
8-880.a
Figure 16. Resistor Selection for Increased Output
Voltage
Output Overvoltage Protection
Figure 17. Case Temperature Measurement
Location
The maximum temperature per Figure 17 should not
exceed 100 °C. The output power of the module should
not exceed the rated power for the module as listed in
the Ordering Information table.
The output overvoltage clamp consists of control circuitry, independent of the primary regulation loop, that
monitors the voltage on the output terminals. The control loop of the clamp has a higher voltage set point
than the primary loop (see Feature Specifications
table). This provides a redundant voltage control that
reduces the risk of output overvoltage.
Although the maximum case temperature of the power
modules is 90 °C to 100 °C, you can limit this temperature to a lower value for extremely high reliability.
Overtemperature Protection
For additional information on these modules, refer to
the Thermal Management JC-, JFC-, JW-, and JFWSeries 50 W to 150 W Board-Mounted Power Modules
Technical Note (TN97-008EPS).
The module features an overtemperature protection
circuit to safeguard against thermal damage.
Note that although the maximum case temperature
allowed is lower than 100 °C under some conditions,
this modules derating is equivalent to or better than the
JW050A. At full load, the JW050A power module has a
higher case temperature rise than the JBW050A.
The circuit shuts down the module when the maximum
case temperature is exceeded. The module restarts
automatically after cooling.
10
Lineage Power
JBW050A Power Modules: dc-dc Converter;
36 to 75 Vdc Input, 5 Vdc Output; 50 W
Data Sheet
March 27, 2008
Thermal Considerations (continued)
Heat Transfer Without Heat Sinks
Increasing airflow over the module enhances the heat
transfer via convection. Figure 19 shows the maximum
power that can be dissipated by the module without
exceeding the maximum case temperature versus local
ambient temperature (TA) for natural convection
through 3 m/s (600 ft./min.).
Note that the natural convection condition was measured at 0.05 m/s to 0.1 m/s (10 ft./min. to 20 ft./min.);
however, systems in which these power modules may
be used can 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
19 is shown in the following example.
Example
What is the minimum airflow necessary for a JBW050A
operating at VI = 54 V, an output current of 10 A, and a
maximum ambient temperature of 70 °C?
Solution
Given: VI = 54 V
IO = 10 A
TA = 70 °C
POWER DISSIPATION, PD (W)
12
10
8
6
MAX CASE TEMP
3.0 m/s (600 ft./min.)
2.0 m/s (400 ft./min.)
1.0 m/s (200 ft./min.)
0.5 m/s (100 ft./min.)
0.25 m/s (50 ft./min.)
NATURAL CONVECTION
4
2
0
0
20
40
60
80
100
LOCAL AMBIENT TEMPERATURE, TA (˚C)
1-0705
Figure 19. Forced Convection Power Derating with
No Heat Sink; Either Orientation
Heat Transfer with Heat Sinks
The power modules have through-threaded, M3 x 0.5
mounting holes, which enable heat sinks or cold plates
to attach to the module. The mounting torque must not
exceed 0.56 N-m (5 in.-lb.). For a screw attachment
from the pin side, the recommended hole size on the
customer’s PWB around the mounting holes is
0.130 ± 0.005 inches. If a larger hole is used, the
mounting torque from the pin side must not exceed
0.25 N-m (2.2 in.-lb.).
Thermal derating with heat sinks is expressed by using
the overall thermal resistance of the module. Total
module thermal resistance (θca) is defined as the maximum case temperature rise (ΔTC, max) divided by the
module power dissipation (PD):
Determine PD (Use Figure 18):
PD = 9.5 W
Determine airflow (v) (Use Figure 19):
(TC – TA)
C, max
θ ca = ΔT
--------------------- = ------------------------
v = 1.0 m/s (200 ft./min.)
PD
POWER DISSIPATION, PD (W)
VI = 75 V
VI = 48 V
VI = 36 V
8
6
4
2
0
0
2
4
6
OUTPUT CURRENT, IO (A)
8
10
1-0697
Figure 18. Power Dissipation vs. Output Current
Lineage Power
PD
The location to measure case temperature (TC) is
shown in Figure 17. Case-to-ambient thermal resistance vs. airflow is shown, for various heat sink configurations and heights, in Figure 20. These curves were
obtained by experimental testing of heat sinks, which
are offered in the product catalog.
12
10
120
JBW050A Power Modules: dc-dc Converter;
36 to 75 Vdc Input, 5 Vdc Output; 50 W
Thermal Considerations (continued)
Use Figure 20 to determine air velocity for the 1/2 inch
heat sink.
Heat Transfer With Heat Sinks (continued)
8
CASE-TO-AMBIENT THERMAL
RESISTANCE, θCA (°C/W)
Data Sheet
March 27, 2008
The minimum airflow necessary for the JBW050A
module is 1.52 m/s (300 ft./min.).
Custom Heat Sinks
7
NO HEAT SINK
1/4 in. HEAT SINK
1/2 in. HEAT SINK
1 in. HEAT SINK
1 1/2 in. HEAT SINK
6
5
A more detailed model can be used to determine the
required thermal resistance of a heat sink to provide
necessary cooling. The total module resistance can be
separated into a resistance from case-to-sink (θcs) and
sink-to-ambient (θsa) shown below (Figure 21).
4
3
2
PD
TC
TS
θcs
1
TA
θsa
8-1304
0
0
0.25
(50)
0.51
(100)
0.76
(150)
1.02
(200)
1.27
(250)
1.52
(300)
Figure 21. Resistance from Case-to-Sink and
Sink-to-Ambient
1.78 2.03
(350) (400)
AIR VELOCITY, ms-1 (ft./min.)
8-1052.a
Figure 20. Case-to-Ambient Thermal Resistance
Curves; Either Orientation
These measured resistances are from heat transfer
from the sides and bottom of the module as well as the
top side with the attached heat sink; therefore, the
case-to-ambient thermal resistances shown are generally lower than the resistance of the heat sink by itself.
The module used to collect the data in Figure 20 had a
thermal-conductive dry pad between the case and the
heat sink to minimize contact resistance. The use of
Figure 20 is shown in the following example.
Example
If an 85 °C case temperature is desired, what is the
minimum airflow necessary? Assume the JBW050A
module is operating at VI = 54 V and an output current
of 10 A, maximum ambient air temperature of 70 °C,
and the heat sink is 1/2 inch.
Solution
Given: VI = 54 V
IO = 10 A
TA = 70 °C
TC = 85 °C
Heat sink = 1/2 in.
Determine PD by using Figure 18:
PD = 9.5 W
Then solve the following equation:
TC – TA
θca = -------------------PD
85 – 70
θca = -----------------9.5
For a managed interface using thermal grease or foils,
a value of θcs = 0.1 °C/W to 0.3 °C/W is typical. The
solution for heat sink resistance is:
( TC – TA)
PD
θ sa = ------------------------- – θ cs
This equation assumes that all dissipated power must
be shed by the heat sink. Depending on the userdefined application environment, a more accurate
model, including heat transfer from the sides and bottom of the module, can be used. This equation provides a conservative estimate for such instances.
Solder, Cleaning, and Drying
Considerations
Post solder cleaning is usually the final circuit-board
assembly process prior to electrical testing. The result
of inadequate circuit-board 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 the Board-Mounted Power
Modules Soldering and Cleaning Application Note
(AP01-056EPS).
EMC Considerations
For assistance with designing for EMC compliance,
please refer to the FLTR100V10 data sheet
(FDS01-043EPS).
Layout Considerations
Copper paths must not be routed beneath the power
module mounting inserts. For additional layout guidelines, refer to the FLTR100V10 data sheet
(FDS01-043EPS).
·
θca = 1.58 °C/W
12
Lineage Power
JBW050A Power Modules: dc-dc Converter;
36 to 75 Vdc Input, 5 Vdc Output; 50 W
Data Sheet
March 27, 2008
Outline Diagram
Dimensions are in millimeters and (inches).
Tolerances: x.x mm ± 0.5 mm (x.xx in. ± 0.02 in.)
x.xx mm ± 0.25 mm (x.xxx in. ± 0.010 in.)
Top View
57.9 (2.28) MAX
61.0
(2.40)
MAX
VI(+)
VO(+)
ON/
OFF
+ SEN
TRIM
CASE
- SEN
VO(-)
VI(-)
Note:Pinout marking for reference only
Side View
0.51 (0.020)
12.7 (0.50)
MAX
2.06 (0.081) DIA
SOLDER-PLATED BRASS,
2 PLACES (-OUTPUT
AND +OUTPUT)
1.02 (0.040) DIA
SOLDER-PLATED
BRASS, 7 PLACES
5.1 (0.20)
MIN
Bottom View
STANDOFF,
12.7 (0.50) MAX 4 PLACES
7.1
(0.28)
MOUNTING INSERTS
M3 x 0.5 THROUGH,
4 PLACES
5.1 (0.20)
7.1 (0.28)
10.16
(0.400)
50.8
(2.00)
25.40
(1.000)
35.56
(1.400)
4
5
3
6
7
2
1
4.8
(0.19)
8
48.26 (1.900)
TERMINALS
10.16
(0.400) 17.78
(0.700)
25.40
(1.000)
35.56
(1.400)
9
48.3 (1.90)
MOUNTING HOLES
1-0714
Lineage Power
JBW050A Power Modules: dc-dc Converter;
36 to 75 Vdc Input, 5 Vdc Output; 50 W
Data Sheet
March 27, 2008
Recommended Hole Pattern
Component-side footprint.
Dimensions are in millimeters and (inches).
57.9 (2.28) MAX
4.8
(0.19)
48.3 (1.90)
VI (+)
35.56
(1.400)
50.8
(2.00)
48.26
(1.900)
VO (+)
ON/OFF
35.56
(1.400)
+SEN
25.40
(1.000)
TRIM
25.40
(1.000)
10.16
(0.400)
CASE
–SEN
VI (–)
VI (–)
10.16
(0.400)
61.0
(2.40)
MAX
17.78
(0.700)
5.1 (0.20)
12.7 (0.50)
MAX
MOUNTING INSERTS
MODULE OUTLINE
8-1945a
Ordering Information
Table 4. Device Codes
Input
Voltage
Output
Voltage
Output
Power
Remote On/Off
Logic
Device
Code
Comcode
48 V
5.0 V
50 W
Negative
JBW050A1
108975426
48 V
5.0 V
50 W
Positive
JBW050A
108966060
Table 5. Device Options
Option*
Device Code Suffix**
Short pins: 3.68 mm ± 0.25 mm
(0.145 in. ± 0.010 in.)
Approved for basic insulation
6
-B
* Contact Lineage Power Sales Representatives for availability of these options, samples, minimum
order quantity and lead times.
** When adding multiple options to the product code, add suffix numbers in the descending orders.
14
Lineage Power
JBW050A Power Modules: dc-dc Converter;
36 to 75 Vdc Input, 5 Vdc Output; 50 W
Data Sheet
March 27, 2008
Ordering Information (continued)
Table 6. Device Accessories
Accessory
Comcode
1/4 in. transverse kit (heat sink, thermal pad, and screws)
1/4 in. longitudinal kit (heat sink, thermal pad, and screws)
1/2 in. transverse kit (heat sink, thermal pad, and screws)
1/2 in. longitudinal kit (heat sink, thermal pad, and screws)
1 in. transverse kit (heat sink, thermal pad, and screws)
1 in. longitudinal kit (heat sink, thermal pad, and screws)
1 1/2 in. transverse kit (heat sink, thermal pad, and screws)
1 1/2 in. longitudinal kit (heat sink, thermal pad, and screws)
407243989
407243997
407244706
407244714
407244722
407244730
407244748
407244755
Dimensions are in millimeters and (inches).
1/4 IN.
1/2 IN.
1 IN.
61
(2.4)
1 1/2 IN.
57.9 (2.28)
D000-d.cvs
D000c
Figure 22. Longitudinal Heat Sink
Lineage Power
Figure 23. Transverse Heat Sink
JBW050A Power Modules: dc-dc Converter;
36 to 75 Vdc Input, 5 Vdc Output; 50 W
Data Sheet
March 27, 2008
A sia-Pacific Head qu art ers
T el: +65 6 41 6 4283
World W ide Headq u arters
Lin eag e Po wer Co rp oratio n
30 00 Sk yline D rive, Mesquite, T X 75149, U SA
+1-800-526-7819
(Outs id e U .S.A .: +1- 97 2-2 84 -2626)
www.line ag ep ower.co m
e-m ail: tech sup [email protected] lin ea gep ower.co m
Eu ro pe, M id dle-East an d Afric a He ad qu arters
T el: +49 8 9 6089 286
Ind ia Head qu arters
T el: +91 8 0 28411633
Lineage Power reserves the right to make changes to the produc t(s) or information contained herein without notice. No liability is ass umed as a res ult of their use or
applic ation. No rights under any patent acc ompany the sale of any s uc h pr oduct(s ) or information.
© 2008 Lineage Power Corpor ation, (Mesquite, Texas ) All International Rights Res er ved.
March 27, 2008
FDS02-039EPS (Replaces ADS02-012EPS)