Advance Data Sheet
May 1999
JAW050A and JAW07 5A Power Modules:
dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 W to 75 W
The JAW Series Power Modules use surface-mount technol-
ogy and deliver efficient and compact dc-dc conversion.
Applications
■Distr i buted power architecture s
Options
■Heat sinks available for extended operation
■Choice of remote on/off logic configuration
Features
■Small size: 61.0 mm x 57.9 mm x 12.7 mm
(2.40 in. x 2.28 in. x 0.50 in.)
■High power density
■High efficiency: 84% typical
■Low output noise
■Constant frequency
■Industry-standard pinout
■Metal cas e
■2:1 input voltage range
■Overtemperature protection
■Remote sense
■Remote on/off
■Adjustable output voltage
■Overvoltage and overcurrent protection
■Case ground pin
■ISO9001 and ISO14001 Certified manufacturing
facilities
■
UL
*
1950 Recognized,
CSA
† C22.2 No. 950-95
Certified, VDE 0805 (EN60950, IEC950) Licensed
■CE mark meets 73/23/EEC and 93/68/EEC
directives‡
Description
The JAW050A and JAW075A Power Modules are dc-dc converters that operate over an input voltage range of
36 Vdc to 75 Vdc and provide a regulated dc output. The outputs are fully isolated from the inputs, allowing
versatile polarity configurations and grounding connections. The modules have maximum power ratings from
50 W to 75 W at a typical full-load efficiency of 84%.
The sealed modules offer a metal baseplate for improved thermal performance. 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.
*
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 follo wed. (The CE mark is placed on selected products.)
2Tyco Electronics Corp.
Advance Dat a S heet
May 1999dc-dc Con verters; 36 Vdc to 75 Vdc Input, 5 Vdc Output; 50 W to 75 W
JAW050A and JAW075A Power Modules:
Absolute Maximum Ratings
Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are abso-
lute 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.
Electrical Specifications
Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature
conditions.
Table 1. Input Specifications
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 fle xibility, internal fus-
ing is not included; however , to achiev e maximum safety and system protection, always use an input line fuse. The
safety agencies require a normal-blow fuse with a maximum rating of 6 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.
Parameter Symbol Min Max Unit
Input Voltage:
Continuous
Transient (100 ms) VI
VI, trans —
—80
100 Vdc
V
Operating Case Temperature
(See Thermal Considerations section.) TC–40 100 °C
Storage Temperature Tstg –55 125 °C
I/O Isolation Voltage ——1500 Vdc
Parameter Symbol Min Typ Max Unit
Operating Input Voltage VI36 48 75 Vdc
Maximum Input Current
(VI = 0 V to 75 V; IO = IO, max):
JAW050A1 (See Figure 1.)
JAW075A1 (See Figure 2.) II, max
II, max —
——
—3.0
3.5 A
A
Inru sh Transient i2t——1.0 A2s
Input Reflected-ripple Current, Peak- to-peak
(5 Hz to 20 MHz, 12 µH source impedance;
see Figure 9.)
—— 5—mAp-p
Input Ripple Rejection (120 Hz) ——60 —dB
Tyco Electronics Corp. 3
Advance Data Shee t
May 1999 dc-dc C on verter s; 36 Vdc to 75 Vdc Input, 5 Vdc Output ; 50 W t o 75 W
JAW050A and JAW075A Power Modules:
Electrical Specifications (continued)
Table 2. Output Specifications
* Please consult your sales representative or the factory.
†These are manuf acturing test limits. In some situations, results may differ.
Table 3. Isolation Specifications
Parameter Device Symbol Min Typ Max Unit
Output Voltage Set Point
(VI = 48 V; IO = I O, max; TC = 25 °C) All VO, set 4.92 5.0 5.08 Vdc
Output Voltage
(Over all operating input voltage, resistive load,
and temperature conditions until end of life.
See Figure 11.)
All VO4.85 —5.15 Vdc
Out put Regulation:
Line (VI = 36 V to 75 V)
Load (IO = IO, min to IO, max)
Temperature (TC = –40 °C to +100 °C)
All
All
All
—
—
—
—
—
—
0.01
0.05
15
0.1
0.2
50
%VO
%VO
mV
Output Ripple and Noise Voltage
(See Figure 10.):
RMS
Peak-to-peak (5 Hz to 20 MHz) All
All —
——
——
—40
150 mVrms
mVp-p
External Load Capac ita nc e All —0——*µF
Output Current
(At IO < IO, min, the modules ma y e xceed output
ripple specifications.)
JAW050A1
JAW075A1 IO
IO0.5
0.5 —
—10
15 A
A
Output Current-limit Inception
(VO = 90% of VO, nom)JAW050A1
JAW075A1 IO, cli
IO, cli —
—12.0
18.0 14†
21†A
A
Output Short-circuit Current (VO = 250 mV) All ——170 —%IO, max
Effi ciency (VI = 48 V; IO = IO, max; TC = 70 °C) JAW050A1
JAW075A1 η
η—
—84
84 —
—%
%
Switching Frequency All ——320 —kHz
Dynamic Response
(ýIO/ýt = 1 A/10 µs, VI = 48 V, TC = 2 5 °C;
tested without any load capacitance.):
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)
All
All
All
All
—
—
—
—
—
—
—
—
5
300
5
300
—
—
—
—
%VO, set
µs
%VO, set
µs
Parameter Min Typ Max Unit
Isolation Capacitance —2500 —pF
Isolation Resistance 10 ——M¾
4Tyco Electronics Corp.
Advance Dat a S heet
May 1999dc-dc Con verters; 36 Vdc to 75 Vdc Input, 5 Vdc Output; 50 W to 75 W
JAW050A and JAW075A Power Modules:
General Specifications
Feature Specifications
Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature
conditions. See Feature Descriptions for additional information.
* These are manuf acturing test limits. In some situations, results may differ.
Parameter Min Typ Max Unit
Calculated MTBF (IO = 80% of IO, max; T C = 40 °C) 3,000,000 hours
Weight ——100 (3.5) g (oz.)
Parameter Symbol Min Typ Max Unit
Remote On/Off Signal Interface
(VI = 0 V to 75 V; open collector or equivalent compatible;
signal referenced to VI(–) termi nal ; see Fi gu re 12 and
Feature Descriptions.):
JAWxxxA1 Preferred Logic:
Logic Low—Module On
Logic High—Module Off
JAWxxxA 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 8.)
(IO = 80% of IO, max; VO within ±1% of steady state)
Von/off
Ion/off
Von/off
Ion/off
—
0
—
—
—
—
—
—
—
—
40
1.2
1.0
15
50
80
V
mA
V
µA
ms
Output Voltage Adjustment (See Feature Descriptions.):
Output Voltage Remote-sense Range
Output Voltage Set-point Adjustment Range (trim) —
——
60 —
—0.5
110 V
%VO, nom
Output Overvoltage Protection (shutdown) VO, sd 5.9* 6.0 7.0* V
Overtemperature Protection (shutdown) TC—105 —°C
Advance Data Shee t
May 1999
Tyco Electronics Corp. 5
dc-dc C on verter s; 36 Vdc to 75 Vdc Input, 5 Vdc Output ; 50 W t o 75 W
JAW050A and JAW075A Power Modules:
Characteristic Curves
The following figures provide typical characteristics for the power modules. The figures are identical for both on/off
configurations.
8-2113(C)
Figure 1. Typical JAW050A1 Input Characteristics
at Room Temperature
8-1896(C)
Figure 2. Typical JAW075A1 Input Characteristics
at Room Temperature
8-2110(C)
Figure 3. Typical JAW050A1 Converter Efficiency
vs. Output Current at Room Temperature
8-1925(C)
Figure 4. Typical JAW075A1 Converter Efficiency
vs. Output Current at Room Temperature
5 10152025 70
0.0
INPUT V OLTA GE, VI (V)
1.2
1.0
1.4
1.8
750
1.6
0.8
0.2
IO = 10A
IO = 5A
IO = 0.5A
0.6
0.4
35 40 45 45 55 60 6530
INPUT CURRENT, II
(A)
2515 3020 5010 40 45 55
INPUT VOLT A GE, VI (V)
0.5
75560 65
2.5
3.0
35
IO = 15 A
0
2.0
1.5
1.0
0.0 70
IO = 7.5 A
IO = 1.5 A
INPUT CURRENT, II (A)
45678
76
82
80
79
81
EFFICIENCY, η (%)
84
103
83
78
9
77
75
74
VI = 36 V
VI = 55 V
VI = 75 V
OUTPUT CURRENT, I
O
(A)
515
75
81
82
83
84
85
OUTPUT CURRENT, I
O
(A)
80
79
78
77
76
6 7 8 9 10 11 12 13 1434
V
I
= 55 V
V
I
= 75 V
V
I
= 36 V
EFFICIENCY, η (%)
6Tyco Electronics Corp.
Advance Dat a S heet
May 1999dc-dc Con verters; 36 Vdc to 75 Vdc Input, 5 Vdc Output; 50 W to 75 W
JAW050A and JAW075A Power Modules:
Characteristic Curves (continued)
8-1968(C)
Figure 5. Typical JAW075A1 Output Ripple Voltage
at Room Temperature and 48 Vdc Input
8-1890(C)
Note: Tested without any load capacitance.
Figure 6. T ypical JA W075A1 T ransient Response to
Step Increase in Load from 50% to 75% of
Full Load at Room Temperature and
48 Vdc Input (Waveform Averaged to
Eliminate Ripple Component.)
8-1928(C)
Note: Tested without any load capacitance.
Figure 7. T ypical JA W075A1 T ransient Response to
Step Decrease in Load from 50% to 25%
of Full Load at Room Temperature and
48 Vdc Input (Waveform Av erag ed to
Eliminate Ripple Component.)
8-1892(C)
Note: Tested without any load capacitance.
Figure 8. JAW075A1 Typical Start-Up from Remote
On/Off; IO = IO, max
TIME, t (5 µs/div)
OUTPUT V OLTA GE, VO (V)
(50 mV/div)
IO = 1.0 A
IO = 7.5 A
IO = 15 A
TIME, t (200 µs/div)
OUTPUT VOLTAGE, V
O
(V)
(100 mV/div)
OUTPUT CURRENT, I
O
(A)
(1 A/div)
7.5
TIME, t (200 ms/div)
3.7
OUTPUT VOLTAGE, VO (V)
(100 mV/div)
OUTPUT CURRENT, IO (A)
(1 A/div)
TIME, t (5 ms/div)
OUTPUT VOLTAGE, VO (V)
(1 V/div)
0
0
REMOTE ON/OFF,
VON/OFF
(V)
Advance Data Shee t
May 1999
Tyco Electronics Corp. 7
dc-dc C on verter s; 36 Vdc to 75 Vdc Input, 5 Vdc Output ; 50 W t o 75 W
JAW050A and JAW075A Power Modules:
Test Configurations
8-203(C).l
Note: Measure input reflected-ripple current with a simulated source
inductance (LTEST) of 12 µH. Capacitor CS offsets possible bat-
tery impedance. Measure current as shown above.
Figure 9. Input Reflected-Ripple Test Setup
8-513(C).d
Note: Use a 1.0 µF ceramic capacitor and a 10 µF aluminum or tan-
talum capacitor. Scope measurement should be made using a
BNC socket. Position the load between 51 mm and 76 mm
(2 in. an d 3 in.) from the module.
Figure 10. Peak-to-Peak Output Noise
Measurement Test Setup
8-749(C)
Note: All measurements are taken at the module termin als. When
socket ing, place Kelvin connections at module terminals to
av oid measurement errors due to socket contact resistance.
Figure 11. Output Voltage and Efficiency
Measurement Test Setup
Design Considerations
Input Source Impedance
The power module should be connected to a low
ac-impedance input source. Highly inductive source
impedances can affect the stability of the power mod-
ule. For the test configuration in Figure 9, a 33 µF elec-
trolytic capacitor (ESR < 0.7 ¾ 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.
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
requir eme nts of the end-u se sa fety agency stan dard,
i.e.,
UL
1950,
CSA
C22.2 No. 950-95, and VDE 0805
(EN60950, IEC950).
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:
■The input source is to be provided with reinforced
insulation from any other hazardous voltages, includ-
in g the ac mains; and
■One VI pin and one VO pin are to be grounded or
bot h th e inp ut and o ut put pin s ar e to be k e pt f loa tin g;
and
■The input pins of the module are not operator acces-
sible; and
■Anothe r SELV reliabi li ty tes t is con ducted on the
whole system, as required by the saf ety 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 pins and ground.
The power module has ex tra-low voltage (ELV) outputs
when all inputs are ELV.
The input to these units is to be provided with a maxi-
mum 6 A normal-blow fuse in the ungrounded lead.
TO OSCILLOSCOPE
12 µH
CS 220 µF
ESR < 0.1 Ω
@ 20 ˚C, 100 kHz
VI(+)
VI(–)
BATTERY 33 µF
CURRENT
PROBE
LTEST
ESR < 0.7 Ω
@ 100 kHz
VO(+)
VO(–)
1.0 µF RESISTIVE
LOAD
SCOPE
COPPER STRIP
10 µF
V
I
(+)
I
I
I
O
SUPPLY
CONTACT
RESISTANCE
CONTA CT AND
DISTRIBUTION LOSSES
LOAD
SENSE(+)
V
I
(
–
)
V
O
(+)
V
O
(
–
)
SENSE(
–
)
ηVO(+) –VO(–)
[]
IO
VI(+) –VI(–)
[]
II
------------------------------------------------
x100=%
8Tyco Electronics Corp.
Advance Dat a S heet
May 1999
dc-dc C onverters ; 36 Vdc to 7 5 Vdc I nput, 5 V dc Output ; 50 W to 7 5 W
JAW050A and JAW075A Power Modules:
Feature Descriptions
Overcurrent Protection
To provide protection in a fault (output overload) condi-
tion, the unit is equipped with internal current-limiting
circuitry and can endure an ov ercurrent condition indef-
initely.
At the point of current- li mit in ce ption, the uni t shif ts
from voltage control to current control. If the output v olt-
age is pulled very low during a sev ere fault, the current-
limit circuit can exhibit either foldback or tailout charac-
teris tics (output current decrease or increase).
The unit will try to restart after an overcurrent shut
down. If the output overload condition still exists when
the unit restarts, it will shut down again. This operation
will continue indefinitely until the overcurrent condition
is corrected.
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 dur-
ing a logic high and on during a logic low. Negative
logic, device code suffix “1,” is the factory-preferred
configuration.
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 V to 1.2 V. The
maximum Ion/off during a logic low is 1 mA. The s witch
should maintain a logic-low voltage while sinking 1 mA.
During a logic high, the maximum Von/off generated by
the power module is 15 V. The maximum allowable
leakage cu rren t of the switch at Von/off = 15 V is 50 µA.
If not using the remote on/off feature, do one of the
following:
■For negative logic, short ON/OFF pin to VI(–).
■For positive logic, leave ON/OFF pin open.
8-720(C).c
Figure 12. Remote On/Off Implementation
Remote Sense
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 out-
put voltage sense range given in the Feature Specifica-
tions table, i.e.:
[VO(+) – VO(–)] – [SENSE(+) – SENSE(–)] ð 0.5 V
The voltage between the VO(+) and VO(–) ter mi nal s
must not exceed the minimum output overvoltage pro-
tection voltage as indicated in the Feature Specifica-
tions table. This limit includes any increase in voltage
due to remote-sense compensation and output voltage
set-point adju stment (trim). See Figure 13.
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.
8-651(C).m
Figure 13. Effective Circ uit Configuration for
Single-Module Remote-Sense Operat ion
SENSE(+)
VO(+)
SENSE(–)
VO(–)
VI(–)
+
–
Ion/off ON/OFF
VI(+)
LOAD
Von/off
VO(+)
SENSE(+)
SENSE(–)
VO(–)
VI(+)
VI(-)
IOLOAD
CONTACT AND
DISTRIBUTION LOSSES
SUPPLY II
CONTACT
RESISTANCE
Tyco Electronics Corp. 9
Advance Data Shee t
May 1999 dc-dc Con verters; 36 V dc to 75 Vdc Input, 5 Vdc Output; 50 W to 75 W
JAW050A and JAW075A Power Modules:
Feature Descriptions (continued)
Output Volta ge 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.
If not using the trim feature, leave the TRIM pin open.
With an external resistor between the TRIM and
SENSE(–) pins (Radj-down), the output voltage set point
(VO, adj) decreases (see Figure 14). The following equa-
ti on determines the required external-resistor value to
obtain a percentage output voltage change of ý%.
The test results for this configuration are displayed in
Figure 15. 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 16).
The following equation determines the required exter-
nal-resistor value to obtain a percentage output voltage
change of ý%.
The test results for this configuration are displayed in
Figure 17.
The voltage between the VO(+) and VO(–) terminals
must not ex c eed the minimum output overvoltage pro-
tection voltage as indicated in the Feature Specifica-
tions table. This limit includes any incr ease in voltage
due to remote-sense compensation and output voltage
set-point adjustment (tri m). See Figure 13.
8-748(C).b
Figure 14. Circuit Configuration to Decrease
Output Voltage
8-1783(C)
Figure 15. Resistor Selection for Decreased
Output Voltage
8-715(C).b
Figure 16. Circuit Configuration to Increase
Output Voltage
8-1784(C)
Figure 17. Resistor Selection for Increased Output
Voltage
Radj-down 1000
∆%
-------------11
–
kΩ
=
Radj-up VO nom
,
()
1∆%
100
--------
+
()
1.225
–
1.225∆%
--------------------------------------------------------------------------1000 11
–
kΩ
=
V
I
(+)
V
I
(–)
ON/OFF
CASE
V
O
(+)
V
O
(–)
SENSE(+)
TRIM
SENSE(–)R
adj-down
R
LOAD
010203040
10 M
PERCENT CHANGE IN OUTPUT VOLTAGE (∆%)
ADJUSTMENT RESISTOR V ALUE (Ω)
1 M
100 k
10 k
VI(+)
VI(–)
ON/OFF
CASE
VO(+)
VO(–)
SENSE(+)
TRIM
SENSE(–)
Radj-up RLOAD
12 910
100 M
PERCENT CHANGE IN OUTPUT VOLTAGE (∆%)
ADJUSTMENT RESISTOR VALUE (Ω)
10 M
1 M
100 k 3456780
10 Tyco Electronics Corp.
Advance Dat a S heet
May 1999
dc-dc C onverters ; 36 Vdc to 7 5 Vdc I nput, 5 V dc Output ; 50 W to 7 5 W
JAW050A and JAW075A Power Modules:
Feature Descriptions (continued)
Output Overvoltage Protection
The output overvoltage protection consists of circuitry
that monitors the voltage on the output terminals. If the
voltage on the output terminals exceeds the overvolt-
age protection threshold, then the module will shut
down and try to restart. The unit will continue in this
condition until the cause of the overvoltage condition is
removed.
Overtemp erature Protection
These modules feature an overtemperature protection
circuit to safeguard against thermal damage. The cir-
cuit shuts down when the maximum case temperature
is exceeded. The module will automatically restart
when the case temperature cools suffici ently.
Thermal Considerations
Introduction
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 ther-
mally coupled to the case. Heat is removed by conduc-
tion, convection, and radiation to the surrounding
environment. Proper cooling can be verified by mea-
suring the case temperature. Peak temperature (TC)
occurs at the position indicated in Figure 18.
8-716(C).h
Note: Top view, pin locations are for reference only. Measurements
shown in millimeters and (inches).
Figure 18. Case Temperature Measurement
Location
The temperature at this location 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.
Although the maximum case temperature of the power
modules is 100 °C, you can limit this temperature to a
lower value for extremely high reliability.
Heat Tra n sfer Without Heat Sinks
Increasing airflow over the module enhances the heat
transfer via convection. Figures 21 and 22 show the
maximum power that can be dissipated by the module
without e xceeding the maximum case temperature ver-
sus local ambient temperature (TA) for natural convec-
tion through 4 m/s (800 ft./min.). Note that the thermal
performance is orientation dependent. Longitudinal ori-
entation occurs when the long direction of the module
is parallel to the airflow, whereas transverse orientation
occurs when the short direction of the module is paral-
lel to the airflow.
Note that the natural convection condition was mea-
sured 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 typically generate natural convection airflow
rates of 0.3 m/s (60 ft./min.) due to other heat-dissipat-
ing components in the system. The use of Figure 21 is
shown in the following example.
Example
What is the minimum airflow necessary for a
JAW075A1 operating at VI = 55 V, an output current of
15 A, longitudinal orientation, and a maximum ambient
temperature of 55 °C?
Solution
Given: VI = 55 V
IO = 15 A
TA = 55 °C
Determine PD (Use Figure 20.):
PD = 14 W
Determine airflow (v) (Use Figure 21.):
v = 2.3 m/s (460 ft./min.)
MEASURE CASE
TEMPERATURE HERE
VI(–)
ON/OFF
CASE
+ SEN
TRIM
– SEN
VI(+)
VO(–)
VO(+)
30.5
(1.20)
29.0
(1.14)
Tyco Electronics Corp. 11
Advance Data Shee t
May 1999 dc-dc Con verters; 36 V dc to 75 Vdc Input, 5 Vdc Output; 50 W to 75 W
JAW050A and JAW075A Power Modules:
Thermal Considerations (continued)
Heat Transfer Without Heat Sinks (continued)
8-2112(C).a
Figure 19. JAW050A1 Power Dissipation vs.
Output Current
8-1897(C)
Figure 20. JAW075A1 Power Dissipation vs.
Output Current
8-2465(C)
Figure 21. Forced Convection Power Derating with
No Heat Sink; Longitudinal Orientation
8-2466(C)
Figure 22. Forced Convection Power Derating with
No Heat Sink; Transverse Orientation
45678 1019230
5
10
8
12
9
11
7
6
POWER DISSIPATION, PD (W)
4
3
OUTPUT CURRENT, IO (A)
VI = 75V
VI = 55V
VI = 36V
64 75 1139
10 12
5
OUTPUT CURRENT, IO (A)
9
1
5
2 13 14
13
14
81
12
11
10
8
7
6
4
VI = 75 V
VI = 55 V
VI = 36 V
15
16
POWER DISSIPATION, PD (W)
20
18
14
12
10
8
6
4
0010 405060708090100
POWER DISSIPATION, PD (W)
LOCAL AMBI EN T TE MPERATURE, TA (°C)
16
20
2
30
0.1 m/s
(20 ft./min.)
1.0 m/s
(200 ft./min.)
2.0 m/s
(400 ft./min.)
4.0 m/s
(800 ft./min.)
3.0 m/s
(600 ft./min.)
20
18
14
12
10
8
6
4
0010 405060708090100
POWER DISSIPATION, PD (W)
LOCAL AMBIENT TEMPERATURE, TA (°C)
16
20
2
30
0.1 m/s
(20 ft.min.)
1.0 m/s
(200 ft./min.)
2.0 m/s
(400 ft./min.)
4.0 m/s
(800 ft./min.)
3.0 m/s
(600 ft./min.)
12 Tyco Electronics Corp.
Advance Dat a S heet
May 1999
dc-dc C onverters ; 36 Vdc to 7 5 Vdc I nput, 5 V dc Output ; 50 W to 7 5 W
JAW050A and JAW075A Power Modules:
Thermal Considerations (continued)
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.).
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 max-
imum case temperature rise (∆TC, max) divided by the
module power dissipation (PD):
The location to measure case temperature (TC) is
shown in Figure 18. Case-to-ambient thermal resis-
tance vs. airflow is shown, f or various heat sink config-
urations and heights, in Figures 23 and 24. These
curves were obtained by experimental testing of heat
sinks, which are offered in the product catalog.
8-2164(C).a
Figure 23. Case-to-Ambient Thermal Resistance
Curves; Longitudinal Orientation
8-2165(C).a
Figure 24. Case- to-Ambie nt Ther mal Resis tan ce
Curves; Transverse 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 gener-
ally lower than the resistance of the heat sink by itself.
The module used to collect the data in Figures 23 and
24 had a thermal-conductive dry pad between the case
and the heat sink to minimize contact resistance. The
use of Figure 23 is shown in the following example.
Example
If an 82 °C case temperature is desired, what is the
minimum airflow necessary? Assume the JAW075A1
module is operating at VI = 55 V, an output current of
15 A, longitudinal orientation, maximum ambient air
temperature of 40 °C, and the heat sink is 1/4 inch.
θca ∆TCmax,
PD
--------------------- TCTA
–
()
PD
------------------------
==
0.5
(100) 1.0
(200) 1.5
(300) 2.0
(400) 2.5
(500)
0
1
AIR VELOCITY, m/s (ft./min.)
9
3.0
(600)
0
2
3
4
5
6
7
8
1 1/2 IN. HEAT SINK
1 IN. HEAT SINK
NO HEAT SINK
CASE-TO-AMBIENT THERMAL
RESISTANCE, θ
CA
(˚C/W)
1/2 IN. HEAT SINK
1/4 IN. HEAT SINK
0.5
(100) 1.0
(200) 1.5
(300) 2.0
(400) 2.5
(500)
0
1
AIR VELOCITY, m/s (ft./min.)
8
3.0
(600)
0
2
3
4
5
6
7
1 1/2 IN. HEAT SINK
1 IN. HEAT SINK
NO HEAT SINK
1/2 IN. HEAT SINK
1/4 IN. HEAT SINK
CASE-TO-AMBIENT THERMAL
RESISTANCE, θCA
(˚C/W)
Tyco Electronics Corp. 13
Advance Data Shee t
May 1999 dc-dc Con verters; 36 V dc to 75 Vdc Input, 5 Vdc Output; 50 W to 75 W
JAW050A and JAW075A Power Modules:
Thermal Considerations (continued)
Heat Tra nsfer with Heat Sinks (continued)
Solution
Given: VI = 55 V
IO = 15 A
TA = 40 °C
TC = 82 °C
Heat sink = 1/4 in.
Determine PD by using Figure 20:
PD = 14 W
Then solve the follo wing equation:
Use Figure 23 to determine air velocity for the 1/4 inch
heat sink.
The minimum airflow necessary for this module is
1.1 m/s (220 ft./min.).
Custom Heat Sinks
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) as shown in Figu re 25.
8-1304(C)
Figure 25. Resistance from Case-to-Sink and
Sink-to-Ambient
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:
This equation assumes that all dissipated power must
be shed by the heat sink. Depending on the user-
defined application environment, a more accurate
model, including heat transfer from the sides and bot-
tom of the module, can be used. This equation pro-
vides 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 board 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 dry-
ing procedures, refer to the
Board-Mounted Power
Modules: Soldering and Cleaning
Applic ation Note
(AP97-021EPS).
EMC Considerations
For assistance with designing for EMC compliance,
refer to the
FLTR100V10 F ilter Module
Data Sheet
(DS98-152EPS).
Layout Considerations
Copper paths must not be routed beneath the power
module standoffs . For additional lay out guidelines, ref er
to the
FLTR100V10 Filter Module
Data Sheet (DS98-
152EPS).
θca TCTA
–
()
PD
------------------------
=
θca 82 40
–
()
14
------------------------
=
θca 3.0 °C/W
=
PDTCTSTA
θcs θsa
∅
θsa TCTA
–
()
PD
------------------------ θcs
–=
14 Tyco Electronics Corp.
Advance Dat a S heet
May 1999dc-dc Con verters; 36 Vdc to 75 Vdc Input, 5 Vdc Output; 50 W to 75 W
JAW050A and JAW075A Power Modules:
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
Side View
Bottom View
8-716(C).i
* Side label includesTyco name, product designation, safety agency markings, input/output voltage and current ratings, and bar code.
57.9 (2.28)
61.0
(2.40)
0.51 (0.020)
12.7 (0.50) 2.06 (0.081) DIA
SOLDER-PLATED BRASS,
2 PLACES (– OUTPUT AND
+ OUTPUT)
1.02 (0.040) DIA
SOLDER-PLATED
BRASS, 7 PLACES
SIDE LABEL*
4.1 (0.16)
MIN
48.3 (1.90)
10.16
(0.400)
MOUNTING INSERTS
M3 x 0.5 THROUGH,
4 PLACES
10.16
(0.400)
5.1 (0.20)
12.7 (0.50)
4.8
(0.19)
48.26 (1.900)
STANDOFF,
4 PLACES
7.1 (0.28)
7.1
(0.28)
VO(–)
–SEN
TRIM
+SEN
CASE
ON/OFF
VI(+)
VI(–)
VO(+)
17.78
(0.700)25.40
(1.000)35.56
(1.400)
25.40
(1.000)
50.8
(2.00)
35.56
(1.400)
Tyco Electronics Corp. 15
Advance Data Shee t
May 1999 dc-dc C on verter s; 36 Vdc to 75 Vdc Input, 5 Vdc Output ; 50 W t o 75 W
JAW050A and JAW075A Power Modules:
Recommended Hole Patter n
Component-side footprint.
Dimensions are in millimeters and (inches).
8-716(C).i
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 JAW050A1 108209974
48 V 5.0 V 75 W Negative JAW075A1 108064353
48 V 5.0 V 50 W Positive JAW050A TBD
48 V 5.0 V 75 W Positive JAW075A TBD
10.16
(0.400)
10.16
(0.400)
25.40
(1.000)
35.56
(1.400)
12.7 (0.50)
4.8
(0.19)
MODULE OUTLINE
5.1 (0.20)
48.26 (1.900)
TERMINALS
48.3 (1.90)
61.0
(2.40)
VO(–)
VI(–)
–SEN
TRIM
+SEN
CASE
ON/OFF
VI(+) VO(+)
57.9 (2.28)
50.8
(2.00) 17.78
(0.700)
25.40
(1.000)
35.56
(1.400)
Advance Dat a S heet
May 1999dc-dc Con verters; 36 Vdc to 75 Vdc Input, 5 Vdc Output; 50 W to 75 W
JAW050A and JAW075A Power Modules:
Printed on
Recycled Paper
Tyco El ectronics Power Systems, I nc.
3000 Skyline Drive, Mesquite, TX 75149, USA
+1-800-526-7819 FAX: + 1-888-315-5182
(Outs ide U.S.A.: +1-972-284-2626, FAX: +1-972-2 84-29 0 0)
http://power.tycoelectronics.com
Tyco Electronics Corporation 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.
© 2001 Tyco Electronics Corporation, Harrisburg, PA. All International Rights Reserved.
Printed in U.S.A.
May 1999
DS97-472EPS
Ordering Information (continued)
Table 5. Device Accessories
Accessory Comcode
1/4 in. transverse kit (heat sink, thermal pad, and screws) 407243989
1/4 in. longitudinal kit (heat sink, thermal pad, and screws) 407243997
1/2 in. transverse kit (heat sink, thermal pad, and screws) 407244706
1/2 in. longitudinal kit (heat sink, thermal pad, and screws) 407244714
1 in. transverse kit (heat sink, thermal pad, and screws) 407244722
1 in. longitudinal kit (heat sink, thermal pad, and screws) 407244730
1 1/2 in. transverse kit (heat sink, thermal pad, and screws) 407244748
1 1/2 in. longitudinal kit (heat sink, thermal pad, and screws) 407244755
D000-c.cvs
Figure 26. Longitudinal Heat Sink
57.9 (2.28)
61
(2.4)
1 IN.
1 1/2 IN.
1/4 IN.
1/2 IN.
D000-d.cvs
Figure 27. Transverse Heat Sink
1 IN.
1 1/2 IN.
61 (2.4)
1/4 IN.
1/2 IN.
57.9
(2.28)
