Data Sheet
July 1999
JW050A, JW075A, JW100A, JW150A Power Modules:
dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 W to 150 W
Applications
■
Distributed power architectures
■
Workstations
■
Computer equipment
■
Communications equipment
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 baseplate
■
2:1 input voltage range
■
Overtemperature protection (100 W and 150 W only)
■
Overcurrent and overvoltage protection
■
Remote sense
■
Remote on/off
■
Adjustable output voltage: 60% to 110% of V
O, nom
■
Case ground pin
■
ISO9001 Certified manufacturing facilities
■
UL*
1950
Recognized,
CSA
†
C22.2 No. 950-95
Certified, and VDE 0805 (EN60950, IEC950)
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 equip-
ment should be followed. (The CE mark is placed on selected
products.)
Description
The JW050A, JW075A, JW100A, and JW150A P o wer Modules are dc-dc con verters that operate ov er an input
voltage range of 36 Vdc to 75 Vdc and provide a precisely regulated dc output. The outputs are fully isolated
from the inputs, allowing versatile polarity configurations and grounding connections. The modules have maxi-
mum power ratings from 50 W to 150 W at a typical full-load efficiency of 84%.
The sealed modules off er a metal baseplate for excellent thermal perf ormance. Threaded-through holes are pro-
vided to allow easy mounting or addition of a heat sink f or high-temperature applications . The standard f eature set
includes remote sensing, output trim, and remote on/off for con venient flexibility in distributed pow er applications .
The JW050A, JW075A, JW100A, and JW150A Power Modules
use advanced, surface-mount technology and deliver high-
quality, efficient, and compact dc-dc conversion.
2 Tyco Electronics Corp
Data Sheet
July 1999
dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 W to 150 W
JW050A, JW075A, JW100A, JW150A 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 flexibility, internal fus-
ing is not included; how ever, to achieve maxim um safety and system protection, always use an input line fuse. The
safety agencies require a normal-blow fuse with a maximum rating of 20 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:
JW050A, JW075A
JW100A, JW150A
Transient (100 ms; JW100A, JW150A only)
V
I
V
I
V
I, trans
—
—
—
75
80
100
Vdc
Vdc
V
I/O Isolation Voltage (for 1 minute) — — 1500 Vdc
Operating Case Temperature
(See Thermal Considerations section.) T
C
–40 100 °C
Storage Temper ature T
stg
–55 125 °C
Parameter Symbol Min Typ Max Unit
Operating Input Voltage V
I
36 48 75 Vdc
Maximum Input Current
(V
I
= 0 V to 75 V; I
O
= I
O, max
):
JW050A (See Figure 1.)
JW075A (See Figure 2.)
JW100A (See Figure 3.)
JW150A (See Figure 4.)
I
I, max
I
I, max
I
I, max
I
I, max
—
—
—
—
—
—
—
—
1.7
2.6
3.5
5.2
A
A
A
A
Inrush Transient i
2
t — — 1.0 A
2
s
Input Reflected-ripple Current, Peak-to-peak
(5 Hz to 20 MHz, 12 µH source impedance;
see Figure 17.)
I
I
— 5 — mAp-p
Input Ripple Rejection (120 Hz) — — 60 — dB
Tyco Electronics Corp 3
Data Sheet
July 1999 dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 W to 150 W
JW050A, JW075A, JW100A, JW150A Power Modules:
Electrical Specifications
(continued)
Table 2. Output Specifications
Parameter Device Symbol Min Typ Max Unit
Output Voltage Set Point
(V
I
= 48 V; I
O
= I
O, max
; T
C
= 25 °C) All V
O, set
4.92 5.0 5.08 Vdc
Output Voltage
(Over all oper ating input voltage, resistiv e load,
and temperature conditions until end of life.
See Figure 19.)
All V
O
4.85 — 5.15 Vdc
Output Regulation:
Line (V
I
= 36 V to 75 V)
Load (I
O
= I
O, min
to I
O, max
)
Temperature (T
C
= –40 °C to +100 °C)
All
All
All
—
—
—
—
—
—
0.01
0.05
15
0.1
0.2
50
%V
O
%V
O
mV
Output Ripple and Noise Voltage
(See Figure 18.):
RMS
Peak-to-peak (5 Hz to 20 MHz) All
All —
——
——
—40
150 mVrms
mVp-p
External Load Capacitance All — 0 — * µF
Output Current
(At I
O
< I
O , min
, the modules ma y exceed output
ripple specifications.)
JW050A
JW075A
JW100A
JW150A
I
O
I
O
I
O
I
O
0.5
0.5
0.5
0.5
—
—
—
—
10
15
20
30
A
A
A
A
Output Current-limit Inception
(V
O
= 90% of V
O, nom
)JW050A
JW075A
JW100A
JW150A
I
O, cli
I
O, cli
I
O, cli
I
O, cli
—
—
—
—
12.0
18.0
23.0
34.5
14
†
21
†
26
†
39
†
A
A
A
A
Output Short-circuit Current (V
O
= 250 mV) All — — 170 — %I
O, max
Efficiency (V
I
= 48 V; I
O
= I
O, max
; T
C
= 70 °C) JW050A
JW075A
JW100A
JW150A
η
η
η
η
—
—
—
—
84
84
84
84
—
—
—
—
%
%
%
%
Switching Frequency All — — 500 — kHz
Dynamic Response
(
∆
I
O
/
∆
t = 1 A/10 µs, V
I
= 48 V, T
C
= 25 °C;
tested with a 10 µF aluminum and a 1.0 µF
ceramic capacitor across the load):
Load Change from I
O
= 50% to 75% of I
O, max
:
Peak Deviation
Settling Time (V
O
< 10% of peak deviation)
Load Change from I
O
= 50% to 25% of I
O, max
:
Peak Deviation
Settling Time (V
O
< 10% of peak deviation)
All
All
All
All
—
—
—
—
—
—
—
—
2
300
2
300
—
—
—
—
%V
O, set
µs
%V
O, set
µs
* Consult your sales representative or the factory.
† These are manufacturing test limits. In some situations, results may differ.
4 Tyco Electronics Corp
Data Sheet
July 1999
dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 W to 150 W
JW050A, JW075A, JW100A, JW150A Power Modules:
Electrical Specifications
(continued)
Table 3. Isolation Specifications
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.
Parameter Min Typ Max Unit
Isolation Capacitance — 2500 — pF
Isolation Resistance 10 — — M
Ω
Parameter Min Typ Max Unit
Calculated MTBF (I
O
= 80% of I
O, max
; T
C
= 40 °C) 2,600,000 hr.
Weight — — 100 (3.5) g (oz.)
Parameter Symbol Min Typ Max Unit
Remote On/Off Signal Interface
(V
I
= 0 V to 75 V; open collector or equivalent compatible;
signal referenced to V
I
(–) terminal; see Figure 20 and
Feature Descriptions.):
JWxxxA1 Preferred Logic:
Logic Low—Module On
Logic High—Module Off
JWxxxA Optional Logic:
Logic Low—Module Off
Logic High—Module On Logic Low:
At I
on/off
= 1.0 mA
At V
on/off
= 0.0 V
Logic High:
At I
on/off
= 0.0 µA
Leakage Current
Turn-on Time (See Figure 16.)
(I
O
= 80% of I
O, max
; V
O
within ±1% of steady state)
V
on/off
I
on/off
V
on/off
I
on/off
—
0
—
—
—
—
—
—
—
—
20
1.2
1.0
15
50
35
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
%V
O, nom
Output Overvoltage Protection V
O, clamp
5.9* — 7.0* V
Overtemperature Protection (shutdown)
(100 W and 150 W only; see Feature Descriptions.) T
C
— 105 — °C
* These are manufacturing test limits. In some situations, results may differ.
Data Sheet
July 1999
Tyco Electronics Corp 5
dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 W to 150 W
JW050A, JW075A, JW100A, JW150A Power Modules:
Characteristic Curves
The following figures provide typical characteristics for the power modules. The figures are identical for both on/off
configurations.
8-1159 (C)
Figure 1. Typical JW050A Input Characteristics at
Room Temperature
8-1131 (C)
Figure 2. Typical JW075A Input Characteristics at
Room Temperature
8-1160 (C)
Figure 3. Typical JW100A Input Characteristics at
Room Temperature
8-1137 (C)
Figure 4. Typical JW150A Input Characteristics at
Room Temperature
0 4 8 121620 646872
0.0
0.5
1.0
1.5
2.0
INPUT VOLTAGE, V
I
(V)
24 28 32 36 40 44 48 52 56 60
INPUT CURRENT, I
I
(A)
10 20 30 40 50 60 70 80
0.0
2.5
3
.
0
INPUT VOLTAGE, V
I
(V)
INPUT CURRENT, I
I
(A)
2.0
1.5
1.0
0.5
0
0 4 8 121620 646872
0.0
2.0
2.5
3.0
3.5
4.0
INPUT VOLTAGE, V
I
(V)
INPUT CURRENT, I
I
(A)
1.5
1.0
0.5
24 28 32 36 40 44 48 52 56 60
10 20 30 40 50 8
0
0
5
6
INPUT VOLTAGE, V
I
(V)
INPUT CURRENT, I
I
(A)
4
3
2
1
0 60 70
6 Tyco Electronics Corp
Data Sheet
July 1999
dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 W to 150 W
JW050A, JW075A, JW100A, JW150A Power Modules:
Characteristic Curves
(continued)
8-1165 (C)
Figure 5. Typical JW050A Output Characteristics
at Room Temperature
8-1134 (C)
Figure 6. Typical JW075A Output Characteristics
at Room Temperature
8-1167 (C)
Figure 7. Typical JW100A Output Characteristics
at Room Temperature
8-1140 (C)
Figure 8. Typical JW150A Output Characteristics
at Room Temperature
0 2345 12
0
6
OUTPUT CURRENT, I
O
(A)
1
2
3
4
5
167891011
OUTPUT VOLTAGE, V
O
(V)
12345 161718
0
5
6
OUTPUT CURRENT, I
O
(A)
OUTPUT VOLTAGE, V
O
(V)
4
3
2
1
0 6 7 8 9 10 11 12 13 14 15
0 4 6 8 10 26
0
6
OUTPUT CURRENT, I
O
(A)
OUTPUT VOLTAGE, V
O
(V)
1
2
3
4
5
22412 14 16 18 20 22
5 10152025 40
0
5
6
OUTPUT CURRENT, I
O
(A)
OUTPUT VOLTAGE, V
O
(V)
4
3
2
1
0 30 35
Data Sheet
July 1999
Tyco Electronics Corp 7
dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 W to 150 W
JW050A, JW075A, JW100A, JW150A Power Modules:
Characteristic Curves
(continued)
8-1161 (C)
Figure 9. Typical JW050A Converter Efficiency vs.
Output Current at Room Temperature
8-1132 (C)
Figure 10. T ypical JW075A Con verter Efficiency vs.
Output Current at Room Temperature
8-1163 (C)
Figure 11. T ypical JW100A Con verter Efficiency vs.
Output Current at Room Temperature
8-1138 (C)
Figure 12. T ypical JW150A Con verter Efficiency vs.
Output Current at Room Temperature
012345 10
76
77
78
79
85
OUTPUT CURRENT, I
O
(A)
EFFICIENCY, (%)
6789
80
81
82
83
84
V
I
= 36 V
V
I
= 54 V
V
I
= 72 V
1234567 15
70
80
82
84
86
88
OUTPUT CURRENT, I
O
(A)
EFFICIENCY, (%)
78
76
8
74
72
0 9 10 11 12 13 14
V
I
= 36 V
V
I
= 54 V
V
I
= 72 V
0 4 6 8 10 12 20
76
78
79
80
86
OUTPUT CURRENT, I
O
(A)
EFFICIENCY, (%)
14 16 18
81
82
83
84
85
77
2
V
I
= 36 V
V
I
= 54 V
V
I
= 72 V
10 15 20 25 30
73
86
87
OUTPUT CURRENT, I
O
(A)
EFFICIENCY, (%)
85
84
83
82
0
81
80
79
78
77
76
75
74
V
I
= 36 V
V
I
= 54 V
V
I
= 72 V
5
88 Tyco Electronics Corp
Data Sheet
July 1999
dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 W to 150 W
JW050A, JW075A, JW100A, JW150A Power Modules:
Characteristic Curves
(continued)
8-2014 (C)
Figure 13. T ypical JW150A Output Ripple Voltage at
Room Temperature, 48 V Input, I
O
= Full
Load
8-2057 (C)
Note: Tested with a 10 µF aluminum and a 1.0 µF ceramic capacitor
across the load.
Figure 14. Typical JW150A 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.)
8-2058 (C)
Note: Tested with a 10 µF aluminum and a 1.0 µF ceramic capacitor
across the load.
Figure 15. Typical JW150A 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.)
8-1143 (C).b
Note: Tested with a 10 µF aluminum and a 1.0 µF ceramic capacitor
across the load.
Figure 16. Typical Start-Up from Remote On/Off
JW150A1; IO = IO, max
TIME, t
(
1
µ
s/div
)
OUTPUT VOLTAGE, V
O
(V)
(20 mV/div)
TIME, t
(
100
µ
s/div
)
OUTPUT VOLTAGE, V
O
(V)
(100 mV/div)
OUTPUT CURRENT, I
O
(A)
(5 A/div)
TIME, t
(
100
µ
s/div
)
OUTPUT VOLTAGE, V
O
(V)
(100 mV/div)
OUTPUT CURRENT, I
O
(A)
(5 A/div)
TIME, t (2 ms/div)
0
0
OUTPUT VOLTAGE, V
O
(V)
(1 V/div) REMOTE ON/OFF PIN,
V
ON/OFF
(V)
Tyco Electronics Corp 9
Data Sheet
July 1999 dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 W to 150 W
JW050A, JW075A, JW100A, JW150A 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 17. 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. and 3 in.) from the module.
Figure 18. Peak-to-Peak Output Noise
Measurement Test Setup
8-749 (C)
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 19. 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 17, a 33 µF
electrolytic capacitor (ESR < 0.7 Ω at 100 kHz)
mounted close to the power module helps ensure sta-
bility of the unit. For other highly inductive source
impedances, consult the factory for further application
guidelines.
TO OSCILLOSCOPE
12 µH V
I
(+)
V
I
(–)
CURRENT
PROBE
L
TEST
BATTERY C
S
220 µF
ESR < 0.1 Ω
@ 20 °C, 100 kHz 33 µF
ESR < 0.7 Ω
@ 100 kHz
V
O
(+)
V
O
(–)
1.0 µF RESISTIVE
LOAD
SCOPE
COPPER STRIP
10 µF
V
I
(+)
I
I
I
O
SUPPLY
CONTACT
RESISTANCE
CONTACT AND
DISTRIBUTION LOSSES
LOAD
SENSE(+)
V
I
(–)
V
O
(+)
V
O
(–)
SENSE(–)
ηVO(+)
–
V
O
(–)
[]
I
O
V
I
(+)
–
V
I
(–)
[]
I
I
------------------------------------------------
x
100 %=
1010 Tyco Electronics Corp
Data Sheet
July 1999
dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 W to 150 W
JW050A, JW075A, JW100A, JW150A Power Modules:
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. 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 meet-
ing 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 hazardous v oltages, including the
ac mains.
■
One V
I
pin and one V
O
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 acces-
sible.
■
Another SELV reliability test is conducted 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 pin and ground.
The power module has extra-low v oltage (ELV) outputs
when all inputs are ELV.
The input to these units is to be provided with a maxi-
mum 20 A normal-blow fuse in the ungrounded lead.
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 current limiting for an unlim-
ited 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 e xhibit either foldbac k or tai-
lout characteristics (output current decrease or
increase). The unit operates normally once the output
current is brought back into its specified range.
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 (code suffix “1”) is the factory-preferred configura-
tion.
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 V
I
(–) terminal (V
on/off
). The
switch can be an open collector or equivalent (see
Figure 20). A logic low is V
on/off
= 0 V to 1.2 V. The
maximum I
on/off
during a logic low is 1 mA. The switch
should maintain a logic-low voltage while sinking 1 mA.
During a logic high, the maximum V
on/off
generated by
the power module is 15 V. The maximum allowable
leakage current of the switch at V
on/off
= 15 V is 50 µA.
If not using the remote on/off f eature, do one of the
following:
■
F or negativ e logic , short ON/OFF pin to V
I
(–).
■
For positive logic, leave ON/OFF pin open.
8-720 (C).c
Figure 20. Remote On/Off Implementation
SENSE(+)
VO(+)
SENSE(–)
VO(–)
VI(–)
+
–
Ion/off ON/OFF
VI(+)
LOAD
Von/off
Tyco Electronics Corp 11
Data Sheet
July 1999 dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 W to 150 W
JW050A, JW075A, JW100A, JW150A Power Modules:
Feature Descriptions
(continued)
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.:
[V
O
(+) – V
O
(–)] – [SENSE(+) – SENSE(–)]
≤
0.5 V
The voltage between the V
O
(+) and V
O
(–) terminals
must not exceed the minimum value of the output over-
voltage protection. This limit includes any increase in
voltage due to remote-sense compensation and output
voltage set-point adjustment (trim). See Figure 21.
If not using the remote-sense feature to regulate the
output at the point of load, then connect SENSE(+) to
V
O
(+) and SENSE(–) to V
O
(–) 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.
8-651 (C).m
Figure 21. Effective Circuit Configuration for
Single-Module Remote-Sense Operation
Output Voltage Set-P oint 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 (R
adj-down
), the output voltage set point
(V
O, adj
) decreases (see Figure 22). The following equa-
tion determines the required external-resistor value to
obtain a percentage output voltage change of
∆
%.
The test results for this configuration are displayed in
Figure 23. This figure applies to all output voltages.
With an external resistor connected between the TRIM
and SENSE(+) pins (R
adj-up
), the output voltage set
point (V
O, adj
) increases (see Figure 24).
The following equation determines the required exter-
nal-resistor value to obtain a percentage output v oltage
change of
∆
%.
The test results for this configuration are displayed in
Figure 25.
The voltage between the V
O
(+) and V
O
(–) terminals
must not exceed the minimum value of the output over-
voltage protection. This limit includes any increase in
voltage due to remote-sense compensation and output
voltage set-point adjustment (trim). See Figure 21.
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.
V
O
(+)
SENSE(+)
SENSE(–)
V
O
(–)
V
I
(+)
V
I
(–)
I
O
LOAD
CONTACT AND
DISTRIBUTION LOSSES
SUPPLY I
I
CONTACT
RESISTANCE
Radj-down 100
∆%
----------2–
k
Ω
=
Radj-up VO100 ∆%+()
1.225∆%
-------------------------------------- 100 2∆%+()
∆%
----------------------------------
–
k Ω
=
1212 Tyco Electronics Corp
Data Sheet
July 1999
dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 W to 150 W
JW050A, JW075A, JW100A, JW150A Power Modules:
Feature Descriptions
(continued)
Output Voltage Set-Point Adjustment
(Trim)
(continued)
8-748 (C).b
Figure 22. Circuit Configuration to Decrease
Output V oltage
8-879 (C)
Figure 23. Resistor Selection for Decreased
Output V oltage
8-715 (C).b
Figure 24. Circuit Configuration to Increase
Output V oltage
8-880 (C).a
Figure 25. Resistor Selection for Increased Output
Voltage
Output Overvoltage Protection
The output overvoltage clamp consists of control cir-
cuitry, independent of the primary regulation loop, that
monitors the voltage on the output terminals. The con-
trol 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.
Overtemperature Protection
The 100 W and 150 W modules f eature an o vertemper-
ature protection circuit to safeguard against thermal
damage.
The circuit shuts down the module when the maximum
case temperature is exceeded. The module restarts
automatically after cooling.
V
I
(+)
V
I
(–)
ON/OFF
CASE
V
O
(+)
V
O
(–)
SENSE(+)
TRIM
SENSE(–) R
adj-down
R
LOAD
0 10203040
100
1k
100k
1M
% CHANGE IN OUTPUT VOLTAGE (∆%)
10k
ADJUSTMENT RESISTOR VALUE (Ω)
VI(+)
VI(–)
ON/OFF
CASE
VO(+)
VO(–)
SENSE(+)
TRIM
SENSE(–)
Radj-up RLOAD
0246 10
10k
100k
10M
% CHANGE IN OUTPUT VOLTAGE (∆%)
1M
ADJUSTMENT RESISTOR VALUE (Ω)
8
Tyco Electronics Corp 13
Data Sheet
July 1999 dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 W to 150 W
JW050A, JW075A, JW100A, JW150A Power Modules:
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 (T
C
)
occurs at the position indicated in Figure 26.
8-716 (C).f
Note: Top view, pin locations are for reference only.
Measurements shown in millimeters and (inches).
Figure 26. 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.
For additional information on these modules, refer to
the
Thermal Management JC-, JFC-, JW-, and JFW-
Series 50 W to 150 W Board-Mounted Power Modules
Technical Note
(TN97-008EPS).
Heat Transfer Without Heat Sinks
Increasing airflow over the module enhances the heat
transfer via convection. Figure 27 shows the maximum
power that can be dissipated by the module without
e xceeding the maximum case temperature v ersus local
ambient temperature (T
A
) for natural convection
through 4 m/s (800 ft./min.).
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 27 is
shown in the following example.
Example
What is the minimum airflow necessary for a JW100A
operating at V
I
= 54 V, an output current of 20 A, and a
maximum ambient temperature of 40 °C?
Solution
Given: V
I
= 54 V
I
O
= 20 A
T
A
= 40 °C
Determine P
D
(Use Figure 30.):
P
D
= 17 W
Determine airflow (v) (Use Figure 27.):
v = 2.0 m/s (400 ft./min.)
8-1150 (C).a
Figure 27. Forced Convection Power Derating with
No Heat Sink; Either Orientation
38.0 (1.50)
7.6 (0.3)
VI (–)
ON/OFF
CASE
+ SEN
TRIM
– SEN
VI (+)
VO (–)
VO (+)
MEASURE CASE
TEMPERATURE HERE
010203040 100
0
35
LOCAL AMBIENT TEMPERATURE, T
A
(°C)
POWER DISSIPATION, P
D
(W)
25
20
10
90
80706050
4.0 m/s (800 ft./min.)
0.1 m/s (NAT. CONV.)
(20 ft./min.)
0.5 m/s (100 ft./min.)
1.0 m/s (200 ft./min.)
1.5 m/s (300 ft./min.)
2.0 m/s (400 ft./min.)
2.5 m/s (500 ft./min.)
3.0 m/s (600 ft./min.)
3.5 m/s (700 ft./min.)
5
15
30
1414 Tyco Electronics Corp
Data Sheet
July 1999
dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 W to 150 W
JW050A, JW075A, JW100A, JW150A Power Modules:
Thermal Considerations
(continued)
Heat Transfer Without Heat Sinks (continued)
8-1182 (C)
Figure 28. JW050A Power Dissipation vs.
Output Current
8-1183 (C)
Figure 29. JW075A Power Dissipation vs.
Output Current
8-1184 (C)
Figure 30. JW100A Power Dissipation vs.
Output Current
8-1185 (C)
Figure 31. JW150A Power Dissipation vs.
Output Current
01234567 10
0
3
6
8
10
12
OUTPUT CURRENT, I
O
(
A
)
98
2
1
4
5
7
9
11
POWER DISSIPATION, P
D
(W)
V
I
= 54 V
V
I
= 36 V
V
I
= 72 V
0123 568910
0
2
4
8
16
20
OUTPUT CURRENT, IO
(
A
)
POWER DISSIPATION, PD (W)
47
6
14
18
12
10
11 13 1412 15
VI = 54 V
VI = 36 V
VI = 72 V
POWER DISSIPATION, P
D
(W)
0 2 4 6 8 14161820
0
4
8
12
16
20
OUTPUT CURRENT, I
O
(
A
)
12
10
2
6
10
14
18
V
I
= 54 V
V
I
= 36 V
V
I
= 72 V
POWER DISSIPATION, P
D
(W)
0 5 10 15 20 30
0
10
20
30
45
OUTPUT CURRENT, I
O
(
A
)
25
5
15
25
35
40
V
I
= 36 V
V
I
= 54 V
V
I
= 72 V
Tyco Electronics Corp 15
Data Sheet
July 1999 dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 W to 150 W
JW050A, JW075A, JW100A, JW150A Power Modules:
Thermal Considerations (continued)
Heat Transfer with Heat Sinks
The power modules have through-threaded, M3 x 0.5
mounting holes, which enab le 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 b y using
the ov er all thermal resistance of the module. Total mod-
ule thermal resistance (θca) is defined as the maximum
case temperature rise (∆TC, max) divided by the module
power dissipation (PD):
The location to measure case temperature (TC) is
shown in Figure 26. Case-to-ambient thermal resis-
tance vs. airflow is shown, for various heat sink config-
urations and heights, in Figure 32. These curves were
obtained by experimental testing of heat sinks, which
are offered in the product catalog.
8-1153 (C)
Figure 32. 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 gener-
ally lower than the resistance of the heat sink by itself.
The module used to collect the data in Figure 32 had a
thermal-conductive dry pad between the case and the
heat sink to minimize contact resistance. The use of
Figure 32 is shown in the following example.
Example
If an 85 °C case temperature is desired, what is the
minimum airflow necessary? Assume the JW100A
module is operating at VI = 54 V and an output current
of 20 A, maximum ambient air temperature of 40 °C,
and the heat sink is 1/2 inch.
Solution
Given: VI = 54 V
IO = 20 A
TA = 40 °C
TC = 85 °C
Heat sink = 1/2 in.
Determine PD by using Figure 30:
PD = 17 W
Then solve the following equation:
Use Figure 32 to determine air velocity for the 1/2 inch
heat sink.
The minimum airflow necessary for the JW100A mod-
ule is 1.3 m/s (260 ft./min.).
θca ∆TC max,
PD
---------------------TCTA–()
PD
------------------------
==
0 0.5
(100) 1.0
(200) 1.5
(300) 2.0
(400) 2.5
(500) 3.0
(600)
0
1
5
6
7
8
AIR VELOCITY, m/s
(
ft./min.
)
4
3
2
1 1/2 IN. HEAT SINK
1 IN. HEAT SINK
1/2 IN. HEAT SINK
1/4 IN. HEAT SINK
NO HEAT SINK
CASE-TO-AMBIENT THERMAL
RESISTANCE, θ
CA
(°C/W)
θca TCTA–()
PD
------------------------
=
θca 85 40–()
17
------------------------
=
θca 2.6 °C/W=
1616 Tyco Electronics Corp
Data Sheet
July 1999
dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 W to 150 W
JW050A, JW075A, JW100A, JW150A Power Modules:
Thermal Considerations (continued)
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) shown below (Figure 33).
8-1304 (C)
Figure 33. 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 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 dry-
ing procedures, refer to the
Board-Mounted Power
Modules Soldering and Cleaning
Application Note
(AP97-021EPS).
EMC Considerations
For assistance with designing for EMC compliance,
please refer to the FLTR100V10 data sheet
(DS98-152EPS).
Layout Considerations
Copper paths must not be routed beneath the power
module mounting inserts. For additional layout guide-
lines, refer to the FLTR100V10 data sheet
(DS98-152EPS).
PDTCTSTA
cs sa
θsa TCTA–()
PD
-------------------------θcs–=
Tyco Electronics Corp 17
Data Sheet
July 1999 dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 W to 150 W
JW050A, JW075A, JW100A, JW150A 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.)
T op View
Side View
Bottom View
8-1945 (C).a
* Side label includes Tyco name, product designation, safety agency markings, input/output voltage and current ratings, and bar code.
57.9 (2.28) MAX
61.0
(2.40)
MAX
5.1 (0.20) MIN
12.70 ± 0.5
(0.500 ± 0.020) 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*
10.16
(0.400)
VO (–)
–SEN
TRIM
+SEN
CASE
ON/OFF
VI (+)
VI (–)
VO (+)
MOUNTING INSERTS
M3 x 0.5 THROUGH,
4 PLACES
10.16
(0.400)
5.1 (0.20)
48.3 (1.90)
48.26
(1.900)
12.7 (0.50)
4.8
(0.19)
17.78
(0.700)25.40
(1.000)
35.56
(1.400)
25.40
(1.000)
50.8
(2.00)
35.56
(1.400)
1818 Tyco Electronics Corp
Data Sheet
July 1999
dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 W to 150 W
JW050A, JW075A, JW100A, JW150A Power Modules:
Recommended Hole Pattern
Component-side footprint.
Dimensions are in millimeters and (inches).
8-1945 (C).a
Ordering Information
Table 4. Device Codes
10.16
(0.400)
10.16
(0.400)
12.7 (0.50)
48.3 (1.90)
48.26
(1.900)
4.8
(0.19)
MOUNTING INSERTS
MODULE OUTLINE
5.1 (0.20)
57
.
9
(2
.
28)
MAX
17.78
(0.700)
25.40
(1.000)
35.56
(1.400)
25.40
(1.000)
50.8
(2.00)
35.56
(1.400)
61.0
(2.40)
MAX
VO (–)
VI (–)
–SEN
TRIM
+SEN
CASE
ON/OFF
VI (+) VO (+)
Input
Voltage Output
Voltage Output
Power Remote On/Off
Logic Device
Code Comcode
48 V 5.0 V 50 W Negative JW050A1 107361370
48 V 5.0 V 75 W Negative JW075A1 107071581
48 V 5.0 V 100 W Negative JW100A1 107361404
48 V 5.0 V 150 W Negative JW150A1 107361453
48 V 5.0 V 50 W P ositive JW050A 107304792
48 V 5.0 V 75 W P ositive JW075A 107361388
48 V 5.0 V 100 W P ositiv e JW100A 107002750
48 V 5.0 V 150 W P ositiv e JW150A 107361446
Tyco Electronics Corp 19
Data Sheet
July 1999 dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 W to 150 W
JW050A, JW075A, JW100A, JW150A Power Modules:
Ordering Information (continued)
Table 5. Device Accessories
Dimensions are in millimeters and (inches).
D000-c.cvs
Figure 34. Longitudinal Heat Sink D000-d.cvs
Figure 35. Transverse Heat Sink
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
57.9 (2.28)
61
(2.4)
1 IN.
1 1/2 IN.
1/4 IN.
1/2 IN.
1 IN.
1 1/2 IN.
61 (2.4)
1/4 IN.
1/2 IN.
57.9
(2.28)
Data Sheet
July 1999
dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 W to 150 W
JW050A, JW075A, JW100A, JW150A Power Modules:
Printed on
Recycled Paper
Tyco Electronics Power Systems, Inc.
3000 Skyline Drive, Mesquite, TX 75149, USA
+1-800-526-7819 FAX: +1-888-315-5182
(Outside U.S.A.: +1-972-284-2626, FAX: +1-972-284-2900
http://power.tycoeleectronics.com
Tyco Electronics Corportation 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.
July 1999
DS99-284EPS (Replaces DS98-088EPS)
