Data Sheet
May 1998
JC050C, JC075C, JC100C Power Modules: dc-dc Converters;
18 Vdc to 36 Vdc Input, 15 Vdc Output; 50 W to 100 W
The JC050C, JC075C, JC100C Power Modules use advanced,
surface-mount technology and deliver high-quality, efficient,
compact dc-dc conversion.
Applications
■Distributed power architectures
■Workstations
■EDP equipment
■Telecommunications
■Wireless
Options
■Choice of remote on/off logic configuration
■Heat sink available for extended operation
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: 88% typical
■Low output noise
■Constant frequency
■Industry-standard pinout
■Metal baseplate
■2:1 input voltage range
■Overtemperature protection (100 W only)
■Remote sense
■Remote on/off
■Adjustable output voltage
■Case ground pin
■
UL
*
Recognized,
CSA
† Certified, VDE Licensed
*
UL
is a registered trademark of Underwriters Laboratories, Inc.
†
CSA
is a registered trademark of Canadian Standards Assn.
Description
The JC050C, JC075C, JC100C Power Modules are dc-dc converters that operate over an input voltage range
of 18 Vdc to 36 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 maximum power ratings
from 50 W to 100 W at typical full-load efficiency of 88%.
The sealed modules offer metal baseplate for excellent thermal performance. Threaded-through holes are pro-
vided 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.
2Tyco Electronics Corp.
Data Sheet
May 199818 Vdc to 36 Vdc Input, 15 Vdc Output; 50 W to 100 W
JC050C, JC075C, JC100C Power Modules: dc-dc Converters;
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; however, to achieve maximum safety and system protection, always use an input line fuse. The
safety agencies require a normal-blow, dc f use 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 VI—50Vdc
I/O Isolation Voltage — — 1500 Vdc
Operating Case Temperature
(See Thermal Considerations section.)
TC–40 100 °C
Storage Temperature Tstg –55 125 °C
Parameter Symbol Min Typ Max Unit
Operating Input Voltage VI18 28 36 Vdc
Maximum Input Current
(VI = 0 V to 36 V; IO = IO, max):
JC050C (See Figure 1)
JC075C
JC100C (See Figure 2.)
II, max
II, max
II, max
—
—
—
—
—
—
3.5
5.2
6.9
A
A
A
Inrush Transient i2t——1.0A
2s
Input Reflected-ripple Current, Peak-to-peak
(5 Hz to 20 MHz, 12 µH source impedance;
see Figure 11.)
—— 5 —mAp-p
Input Ripple Rejection (120 Hz) — — 60 — dB
Tyco Electronics Corp. 3
Data Sheet
May 1998 18 Vdc to 36 Vdc Input, 15 Vdc Output; 50 W to 100 W
JC050C, JC075C, JC100C Power Modules: dc-dc Converters;
Electrical Specifications (continued)
Table 2. Output Specifications
Table 3. Isolation Specifications
Parameter Device Symbol Min Typ Max Unit
Output Voltage
(Over all operating input voltage, resistive load,
and temperature conditions until end of life; see
Figure 13.)
All VO14.55 — 15.45 Vdc
Output Voltage Set Point
(VI = 28 V; IO = IO, max; TC = 25 °C)
All VO, set 14.73 15.0 15.27 Vdc
Output Regulation:
Line (VI = 18 V to 36 V)
Load (IO = IO, min to IO, max )
Temperature (TC = –40 °C to +100 °C)
All
All
All
—
—
—
—
—
—
0.01
0.05
50
0.2
0.4
150
%
%
mV
Output Ripple and Noise Voltage
(See Figure 11.):
RMS
Peak-to-peak (5 Hz to 20 MHz)
All
All
—
—
—
—
—
—
60
250
mVrms
mVp-p
External Load Capacitance (electrolytic) All — 0 — 10,000 µF
Output Current
(At IO < IO, min, the module may exceed output
ripple specifications.)
JC050C
JC075C
JC100C
IO
IO
IO
0.3
0.3
0.3
—
—
—
3.33
5.0
6.7
A
A
A
Output Current-limit Inception
(VO = 90% of VO, nom)
JC050C
JC075C
JC100C
IO, cli
IO, cli
IO, cli
—
—
—
3.8
5.8
7.7
4.6
7.0
8.7
A
A
A
Output Short-circuit Current (VO = 250 mV) All — — 170 — %IO, max
Efficiency (VI = 28 V; IO = IO, max ; TC = 70 °C;
see Figure 13.)
JC050C
JC075C
JC100C
η
η
η
86
86
87
88
88
88
—
—
—
%
%
%
Dynamic Response
(∆IO/∆t = 1 A/10 µs, VI = 28 V, TC = 25 °C):
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
—
—
—
—
—
—
—
—
2
300
2
300
—
—
—
—
%VO, set
µs
%VO, set
µs
Parameter Min Typ Max Unit
Isolation Capacitance — 2500 — pF
Isolation Resistance 10 — — MΩ
4Tyco Electronics Corp.
Data Sheet
May 199818 Vdc to 36 Vdc Input, 15 Vdc Output; 50 W to 100 W
JC050C, JC075C, JC100C Power Modules: dc-dc Converters;
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
Calculated MTBF (IO = 80% of IO, max; TC = 40 °C) 2,600,000 hr.
Weight — — 100 (3.5) g (oz.)
Parameter Symbol Min Typ Max Unit
Remote On/Off Signal Interface
(VI = 0 V to 36 V; open collector or equivalent compatible;
signal referenced to VI(–) terminal; see Figure 14 and
Feature Descriptions.):
JCxxxC1 Preferred Logic:
Logic Low—Module On
Logic High—Module Off
JCxxxC 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 10)
(IO = 80% of IO, max; VO within ±1% of steady state)
Von/off
Ion/off
Von/off
Ion/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)
(Note: Ensure that the combination of remote-sense and trim
do not exceed 15.5 V on the output.)
—
—
—
50
—
—
0.5
103
V
%VO, nom
Output Overvoltage Clamp VO, clamp 16.5 — 20.0 V
Overtemperature Shutdown
(100 W only; see Feature Descriptions.)
Tc — 105 — °C
Tyco Electronics Corp. 5
Data Sheet
May 1998 18 Vdc to 36 Vdc Input, 15 Vdc Output; 50 W to 100 W
JC050C, JC075C, JC100C Power Modules: dc-dc Converters;
Characteristic Curves
The following figures provide typical characteristics for the JC050C, JC075C, JC100C power modules. The figures
are identical for both on/off configurations.
8-2053 (C)
Figure 1. Typical JC050C Input Characteristics at
Room Temperature
8-2054 (C)
Figure 2. Typical JC100C Input Characteristics at
Room Temperature
8-1579 (C)
Figure 3. Typical JC050C Input Characteristics at
Room Temperature
8-1580 (C)
Figure 4. Typical JC100C Output Characteristics at
Room Temperature
INPUT CURRENT, II (A)
20 25 30 35
0
2.5
INPUT VOLTAGE, VI (V)
2
1.5
3.5
400
3
0.5
51510
1
IO = 3.33 A
IO = 1.67 A
IO = .33 A
4
INPUT CURRENT, II (A)
20 25 30 35
0
5
INPUT VOLTAGE, VI (V)
4
3
7
400
6
1
51510
2
IO = 6.67 A
IO = 3.34 A
IO = .67 A
8
14
4
0
8
12
16
2
6
10
1234560
OUTPUT CURRENT, IO (A)
VI = 18 V
VI = 28 V
VI = 36 V
OUTPUT VOLTAGE, VO (V)
14
4
0
8
12
16
2
6
10
1 3 5 87 90
OUTPUT CURRENT, IO
(
A
)
2 4 6
VI = 18 V
VI = 28 V
VI = 36 V
OUTPUT VOLTAGE, VO (V)
Data Sheet
May 1998
66 Tyco Electronics Corp.
18 Vdc to 36 Vdc Input, 15 Vdc Output; 50 W to 100 W
JC050C, JC075C, JC100C Power Modules: dc-dc Converters;
Characteristic Curves (continued)
8-1581 (C)
Figure 5. Typical JC050C Converter Efficiency vs.
Output Current at Room Temperature
8-1582 (C)
Figure 6. Typical JC100C Converter Efficiency vs.
Output Current at Room Temperature
8-1958 (C)
Figure 7. Typical JC100C Output Ripple Voltage at
Room Temperature and 6.7 A Output
8-1956 (C)
Figure 8. Typical JC100C Transient Response to
Step Decrease in Load from 50% to 25%
of Full Load at Room Temperature and 28
V Input (Waveform Averaged to Eliminate
Ripple Component.)
86.0
84.5
81.5
1.5 2.0 2.5 3.0 3.5
80.0
83.5
OUTPUT CURRENT, IO (A)
82.0
83.0
81.0
80.5
85.0
1.0
86.5
EFFICIENCY, η (%)
85.5
84.0
82.5
VI = 18 V
VI = 28 V
VI = 36 V
87.0
84.0
78.0
2 3 5 6 7
76.0
82.0
OUTPUT CURRENT, IO (A)
79.0
77.0
85.0
1
EFFICIENCY, η (%)
86.0
83.0
80.0
4
81.0
VI = 18 V
VI = 28 V
VI = 36 V
TIME, t (1 ms/div)
OUTPUT VOLTAGE, VO (V)
(50 mV/div)
18 V
28 V
36
V
TIME, t (200 ms/div)
OUTPUT CURRENT, IO (A)
(1 A/div)
OUTPUT VOLTAGE, VO (V)
(100 mV/div)
Tyco Electronics Corp. 7
Data Sheet
May 1998 18 Vdc to 36 Vdc Input, 15 Vdc Output; 50 W to 100 W
JC050C, JC075C, JC100C Power Modules: dc-dc Converters;
Characteristic Curves (continued)
8-1957 (C)
Figure 9. Typical JC100C Transient Response to
Step Increase in Load From 50% to 75%
of Full Load at Room Temperature and 28
V Input (Waveform Averaged to Eliminate
Ripple Component.)
8-2055 (C)
Figure 10.Typical Start-Up from Remote On/Off
JC100C1; IO = Full Load
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
battery impedance. Measure current as shown above.
Figure 11. Input Reflected-Ripple Test Setup
8-513 (C).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 7 6mm ( 2in .an d 3in.) from the module.
Figure 12. 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 13. Output Voltage and Efficiency
Measurement Test Setup
TIME, t (200 ms/div)
OUTPUT CURRENT, IO (A)
(1 A/div)
OUTPUT VOLTAGE, VO (V)
(100 mV/div)
TIME, t (5 µs/div)
REMOTE ON/OFF,
VOLTAGE, VON/OFF (V)
OUTPUT VOLTAGE, VO (V)
(5 V/div)
9 V
0 V
15 V
0 V
TO OSCILLOSCOPE
12 µH
C
S
220 µF
ESR < 0.1 Ω
@ 20 ˚C, 100 kHz
V
I
(+)
V
I
(–)
BATTERY 33 µF
CURRENT
PROBE
L
TEST
ESR < 0.7 Ω
@ 100 kHz
VO(+)
VO(–)
1.0 µF RESISTIVE
LOAD
SCOPE
COPPER STRIP
10 µF
VI(+)
IIIO
SUPPLY
CONTACT
RESISTANCE
CONTACT AND
DISTRIBUTION LOSSES
LOAD
SENSE(+)
VI(–)
VO(+)
VO(–)
SENSE(–)
η[Vo(+) – Vo(-)]Io
[Vi(+) – Vi(-)]Ii
-------------------------------------------
100×=
Data Sheet
May 1998
88 Tyco Electronics Corp.
18 Vdc to 36 Vdc Input, 15 Vdc Output; 50 W to 100 W
JC050C, JC075C, JC100C Power Modules: dc-dc Converters;
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 11, 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.
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
22.2-950, and EN60950.
For the converter output to be considered meeting the
requirements of safety extra-low voltage (SELV), the
input must meet SELV requirements.
If the input meets extra-low voltage (ELV) require-
ments, then the converter’s output is considered ELV.
The input to these units is to be provided with a maxi-
mum 20 A normal-blow fuse in the ungrounded lead.
Electrical Descriptions
Current Limit
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 exhibit either foldback or tai-
lout characteristics (output current decrease or
increase). The unit operates normally once the output
current is brought back into its specified range.
Feature Descriptions
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 VI(-) terminal (Von/off). The
switch can be an open collector or equivalent (see
Figure 14). A logic low is Von/off = 0 V to 1.2 V. The max-
imum Ion/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 Von/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 feature, do one of the fol-
lowing:
■For negative logic, short ON/OFF pin to VI(-)
■For positive logic, leave ON/OFF pin open.
8-720 (C).c
Figure 14. 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(–)] ≤ 1.2 V
The voltage between the VO(+) and VO(–) terminals
must not exceed 5.9 V. This limit includes any increase
in voltage due to remote-sense compensation and out-
put voltage set-point adjustment (trim), see Figure 15.
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.
SENSE(+)
VO(+)
SENSE(–)
VO(–)
VI(–)
+
–
Ion/off
ON/OFF
VI(+)
LOAD
Von/off
Tyco Electronics Corp. 9
Data Sheet
May 1998 18 Vdc to 36 Vdc Input, 15 Vdc Output; 50 W to 100 W
JC050C, JC075C, JC100C Power Modules: dc-dc Converters;
Feature descriptions (continued)
Remote Sense (continued)
8-651 (C).h
Figure 15. 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. With an external resistor between the
TRIM and SENSE(–) pins (Radj-down), the output voltage
set point (Vo, adj) decreases (see Figure 16). The follow-
ing equation determines the required external-resistor
value to obtain a percentage output voltage change of
∆%.
The test results for this configuration are displayed in
Figure 17. 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 18).
Note: The output voltage of this module may be increased to a maxi-
mum of 0.5 V. The 0.5 V is the combination of both the remote-
sense and the output voltage set-point adjustment (trim). Do
not exceed 15.5 V between the V O(+) and VO(–) terminals.
The following equation determines the required exter-
nal-resistor value to obtain a percentage output voltage
change of ∆%.
Only trim up to 0.5 V maximum. See note above.
The test results for this configuration are displayed in
Figure 17. For applications requiring voltage between
15 V and 24 V, consider using the JC050H, JC075H,
JC100H (24 V) trimmed down.
The voltage between the VO(+) and VO(–) terminals
must not exceed 16.5 V. This limit includes any
increase in voltage due to remote-sense compensation
and output voltage set-point adjustment (trim). See
Figure 15.
If not using the trim feature, leave the TRIM pin open.
8-748 (C).c
Figure 16. Circuit Configuration to Decrease
Output Voltage
8-1237 (C).a
Figure 17. Resistor Selection for Decreased
Output Voltage
VO(+)
SENSE(+)
SENSE(–)
VO(–)
VI(+)
VI(–)
IOLOAD
CONTACT AND
DISTRIBUTION LOSSES
SUPPLY II
CONTACT
RESISTANCE
Radj-down 100
∆%
----------2–
kΩ=
Radj-up VO100 ∆%+()
1.225∆%
--------------------------------------100 2∆%+()
∆%
----------------------------------
–
kΩ=
VI(+)
VI(–)
ON/OFF
CASE
VO(+)
VO(–)
SENSE(+)
TRIM
SENSE(–)
Radj-down
RLOAD
010 20 30
1
10
100 k
% CHANGE IN OUTPUT VOLTAGE
40 50
100
1 k
10 k
ADJUSTMENT RESISTOR VALUE (½)
Data Sheet
May 1998
1010 Tyco Electronics Corp.
18 Vdc to 36 Vdc Input, 15 Vdc Output; 50 W to 100 W
JC050C, JC075C, JC100C Power Modules: dc-dc Converters;
Feature Descriptions(continued)
Output Voltage Set-Point Adjustment
(Trim) (continued)
8-715 (C).d
Figure 18. Circuit Configuration to Increase
Output Voltage
8-2056 (C)
Figure 19. Resistor Selection for Increased Output
Voltage
Output Overvoltage Clamp
The ouput 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.
Overtermperature Protection (Shutdown)
The 100 W module features an overtemperature pro-
tection 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.
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,a nd 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 20.
8-716 (C).f
Note: Top view, pin locations are for reference.
Measurements shown in millimeters and (inches).
Figure 20. 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.
V
I
(+)
V
I
(–)
ON/OFF
CASE
V
O
(+)
V
O
(–)
SENSE(+)
TRIM
SENSE(–)
R
adj-up
R
LOAD
268
ADJUSTMENT RESISTOR VALUE (Ω)
1004
% CHANGE IN OUTPUT VOLTAGE (∆%)
100k
1M
10M
100M
38.0 (1.50) MEASURE CASE
VI(–)
ON/OFF
CASE
+ SEN
TRIM
– SEN
VI(+)
VO(–)
VO(+)
7.6 (0.3)
TEMPERATURE HERE
Tyco Electronics Corp. 11
Data Sheet
May 1998 18 Vdc to 36 Vdc Input, 15 Vdc Output; 50 W to 100 W
JC050C, JC075C, JC100C Power Modules: dc-dc Converters;
Thermal Considerations (continued)
Introduction (continued)
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 21 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 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 Figur e21 is
shown in the following example.
Example
What is the minimum airflow necessary for a JC100C
operating at nominal line, an output current of 6 A, and
a maximum ambient temperature of 40 °C?
Solution
Given: VI = 28 V
IO = 6 A
TA = 40 °C
Determine PD (Use Figure 23.):
PD = 14.0 W
Determine airflow (v) (Use Figure 21.):
v = 1.5 m/s (300 ft./min.)
8-1150 (C).a
Figure 21. Forced Convection Power Derating with
No Heat Sink; Either Orientation
8-1583 (C)
Figure 22. JC050C Power Dissipation vs.
Output Current
0 10203040 100
0
35
LOCAL AMBIENT TEMPERATURE, TA (˚C)
POWER DISSIPATION, PD (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
0.5 1.0 1.5 2.52.0 3.0
0
6
OUTPUT CURRENT, IO (A)
4
3
5
8
3.5
0.0
7
2
1
9
10
POWER DISSIPATION, PD (W)
VI = 18 V
VI = 28 V
VI = 36 V
Data Sheet
May 1998
1212 Tyco Electronics Corp.
18 Vdc to 36 Vdc Input, 15 Vdc Output; 50 W to 100 W
JC050C, JC075C, JC100C Power Modules: dc-dc Converters;
Thermal considerations (continued)
Heat Transfer Without Heat Sinks (continued)
8-1584 (C)
Figure 23. JC100C Power Dissipation vs.
Output Current
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.-lbs.).
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 20. Case-to-ambient thermal resis-
tance vs. airflow is shown, for various heat sink config-
urations and heights, in Figure 24. These curves were
obtained by experimental testing of heat sinks, which
are offered in the product catalog.
8-1153
Figure 24. 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 Figur e24 had a
thermal-conductive dry pad between the case and the
heat sink to minimize contact resistance. The use of
Figure 24 is shown in the following example
Example
If an 8 5°C case temperature is desired, what is the
minimum airflow necessary? Assume the JC100C
module is operating at nominal line and an output cur-
rent of 6 A, maximum ambient air temperature of 40 °C,
and the heat sink is 0.5 in.
14
6
1 2 3 54 6
0
12
OUTPUT CURRENT, IO (A)
8
10
4
2
16
70
POWER DISSIPATION, PD (W)
18
VI = 18 V
VI = 28 V
VI = 36 V
θca ∆TCmax,
PD
---------------------TCTA
–()
PD
------------------------
==
00.5
(100)
1.0
(200)
1.5
(300)
2.0
(400)
2.5
(500)
3.0
(600)
0
1
5
6
7
8
AIR VELOCITY MEASURED IN m/s (ft./min.)
4
3
2
CASE-TO-AMBIENT THERMAL
RESISTANCE, RCA (°C/W)
1 1/2 IN HEAT SINK
1 IN HEAT SINK
1/2 IN HEAT SINK
1/4 IN HEAT SINK
NO HEAT SINK
Tyco Electronics Corp. 13
Data Sheet
May 1998 18 Vdc to 36 Vdc Input, 15 Vdc Output; 50 W to 100 W
JC050C, JC075C, JC100C Power Modules: dc-dc Converters;
Thermal considerations (continued)
Heat Transfer with Heat Sinks (continued)
Solution
Given: VI = 28 V
IO = 6 A
TA = 40 °C
TC = 85 °C
Heat sink = 0.5 in.
Determine PD by using Figure 23:
PD = 14.0 W
Then solve the following equation:
Use Figure 24 to determine air velocity for the0.5 inch
heat sink.
The minimum airflow necessary for the JC100C
module is 1.0 m/s (200 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) shown below (Figure 25).
8-1304
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.
Layout Considerations
Copper paths must not be routed beneath the power
module mounting inserts.
θca TCTA
–()
PD
------------------------=
θca 85 40–()
14.0
------------------------
=
θca 3.2 °C/W=
PD
TCTSTA
θcs θsa
→
θsa TCTA
–()
PD
-------------------------θcs–=
Data Sheet
May 1998
1414 Tyco Electronics Corp.
18 Vdc to 36 Vdc Input, 15 Vdc Output; 50 W to 100 W
JC050C, JC075C, JC100C Power Modules: dc-dc Converters;
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
8-1945 (C).b
* Side labels include 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 PLCS
SIDE LABELS*
10.16
(0.400)
–SEN
TRIM
+SEN
CASE
ON/OFF
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)
VI (–)V
O (–)
VO (+)VI (+)
15 Tyco Electronics Corp.
Data Sheet
May 199818 Vdc to 36 Vdc Input, 15 Vdc Output; 50 W to 100 W
JC050C, JC075C, JC100C Power Modules: dc-dc Converters;
Recommended Hole Pattern
Component-side footprint.
Dimensions are in millimeters and (inches).
8-1945 (C).b
Ordering Information
Input
Voltage
Output
Voltage
Output
Power
Remote On/
Off Logic
Device
Code Comcode
28 V 15.0 V 50 W negative JC050C1 107314676
28 V 15.0 V 75 W negative JC075C1 TBD
28 V 15.0 V 100 W negative JC100C1 107314692
28 V 15.0 V 50 W positive JC050C 107309874
28 V 15.0 V 75 W positive JC075C TBD
28 V 15.0 V 100 W positive JC100C 107309965
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
–SEN
TRIM
+SEN
CASE
ON/OFF
VI (+) VO (+)
VO (–)
VI (–)
3.30 ± 0.15 (0.130 ± 0.005)
4 PLCS
Data Sheet
May 199818 Vdc to 36 Vdc Input, 15 Vdc Output; 50 W to 100 W
JC050C, JC075C, JC100C Power Modules: dc-dc Converters;
Printed on
Recycled Paper
World Wide Headquarters
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)
www.power.tycoelectronics.com
e-mail: techsupport1@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 Power Systems, Inc. (Mesquite, Texas) All International Rights Reserved.
Printed in U.S.A.
May 1998
DS97-551EPS
Europe, Middle-East and Africa Headquarters
Tyco Electronics (UK) Ltd
Tel: +44 (0) 1344 469 300, Fax: +44 (0) 1344 469 301
Central America-Latin America Headquarters
Tyco Electronics Power Systems
Tel: +54 11 4316 2866, Fax: +54 11 4312 9508
Asia-Pacific Headquarters
Tyco Electronics Singapore Pte Ltd
Tel: +65 482 0311, Fax: 65 480 9299
