Advance Data Sheet
April 2008
JAHW050G, JAHW075G, and JAHW100G Power Modules:
dc-dc Converters; 36 to 75 Vdc Input, 2.5 Vdc Output; 25 W to 50 W
Applications
nDistributed power architectures
nCommunications equipment
nComputer equipment
Options
nChoice of remote on/off logic configuration
nLatching protection features
Features
nSmall size: 61.0 mm x 57.9 mm x 12.7 mm
(2.40 in. x 2.28 in. x 0.50 in.)
nHigh power density
nVery high efficiency: 89% typical
nLow output noise
nConstant frequency
nIndustry-standard pinout
nMetal baseplate
n2:1 input voltage range
nOvertemperature protection (hiccup mode)
nOvercurrent protection (hiccup mode)
nOutput overvoltage protection (hiccup mode)
nRemote sense
nRemote on/off
nAdjustable output voltage
nCase ground pin
nISO* 9001 Certified manufacturing facilities
nMeets the voltage and current requirements for
ETSI 300-132-2 and complies with and is Licensed
for Basic Insulation rating per EN60950 (-B version
only)
nUL†60950 Recognized, CSA‡ C22.2 No. 60950-00
Certified, and VDE § 0805 (IEC60950, IEC950)
Licensed
nCE mark meets 73/23/EEC and 93/68/EEC direc-
tives**
The JAHW Series Power Modules use advanced, surface-
mount technology and deliver high-quality, efficient, and
compact dc-dc conversion.
Description
The JAHW050G, JAHW075G, and JAHW100G Power Modules are dc-dc converters that operate over 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 25 W to 50 W at a typical full-load efficiency of 89%.
The sealed modules offer a metal baseplate for excellent thermal performance. Threaded-through holes are
provided to allow easy mounting or addition of a heat sink for high-temperature applications. The standard fea-
ture set includes remote sensing, output trim, and remote on/off for convenient flexibility in distributed power
applications.
* ISO is a registered trademark of the International Organization for Standardization.
† UL is a registered trademark of Underwriters Laboratories, Inc.
‡ CSA is a registered trademark of Canadian Standards Aisne.
§ VDE is a trademark of Verband Deutscher Elektrotechniker e.V.
** This product is intended for integration into end-use equipment. All the required procedures for CE marking of end-use equipment should be followed. (The CE mark is placed on
selected products.)
2Lineage Power
Advance Data Sheet
April 2008
dc-dc Converters; 36 to 75 Vdc Input, 2.5 Vdc Output; 25 W to 50 W
JAHW050G, JAHW075G, and JAHW100G 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; however, to achieve maximum safety and system protection, always use an input line fuse. The
safety agencies require a normal-blow fuse with a maximum rating of 15 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 (Input to Output and
Input to Case ground pin)
— — 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):
JAHW050G (See Figure 1.)
JAHW075G (See Figure 2.)
JAHW100G (See Figure 3.)
II, max
II, max
II, max
—
—
—
—
—
—
1.2
1.8
2.4
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 17.)
II —5—mAp-p
Input Ripple Rejection (120 Hz) — — 60 — dB
Lineage Power 3
Advance Data Sheet
April 2008 dc-dc Converters; 36 to 75 Vdc Input, 2.5 Vdc Output; 25 W to 50 W
JAHW050G, JAHW075G, and JAHW100G Power Modules:
Electrical Specifications (continued)
Table 2. Output Specifications
* Stability consideration, (See Design Considerations, Output Capacitance Section)
† These are manufacturing test limits. In some situations, results may differ.
‡ Some characteristic are specified with 10 μF aluminum and 1 μF ceramic.
Table 3. Isolation Specifications
Parameter Device Symbol Min Typ Max Unit
Output Voltage Set Point
(VI = 48 V; IO = IO, max; TC = 25 °C)
All VO, set 2.46 2.5 2.54 Vdc
Output Voltage
(Over all operating input voltage, static resistive
load, and temperature conditions until end of
life. See Figure 19.)
All VO2.4 — 2.6 Vdc
Output 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 18.):
RMS
Peak-to-peak (5 Hz to 20 MHz)
All
All
—
—
—
—
—
—
50
100
mVrms
mVp-p
External Load Capacitance All — 0‡—*µF
Output Current
(At IO < IO, min, the modules may exceed output
ripple specifications.)
JAHW050G
JAHW075G
JAHW100G
IO
IO
IO
0.5
0.5
0.5
—
—
—
10
15
20
A
A
A
Output Current-limit Inception
(VO = 90% of VO, nom)
JAHW050G
JAHW075G
JAHW100G
IO, cli
IO, cli
IO, cli
—
—
—
15
20
27
†
†
†
A
A
A
Output Short-circuit Current (VO = 250 mV) All — — 120 — %IO, max
Efficiency (VI = 48 V; IO = IO, max; TC = 70 °C) JAHW050G
JAHW075G
JAHW100G
η
η
η
—
—
—
85
88
89
—
—
—
%
%
%
Switching Frequency All — — 330 — kHz
Dynamic Response
(ΔIO/Δt = 1 A/10 µs, VI = 48 V, TC = 25 °C;
tested with a 10 µF aluminum and a 1.0 µF
tantalum capacitor across the load.):
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
—
—
—
—
—
—
—
—
4
200
4
200
—
—
—
—
%VO, set
µs
%VO, set
µs
Parameter Min Typ Max Unit
Isolation Capacitance — 2500 — pF
Isolation Resistance 10 — — MΩ
4Lineage Power
Advance Data Sheet
April 2008
dc-dc Converters; 36 to 75 Vdc Input, 2.5 Vdc Output; 25 W to 50 W
JAHW050G, JAHW075G, and JAHW100G 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.
Table 4. Feature Specifications
* These are manufacturing test limits. In some situations, results may differ.
Solder, Cleaning, and Drying Considerations
Post solder cleaning is usually the final circuit-board assembly process prior to electrical testing. The result of inad-
equate circuit-board cleaning and drying can affect both the reliability of a power module and the testability of the
finished circuit-board assembly. For guidance on appropriate soldering, cleaning, and drying procedures, refer to
the Board-Mounted Power Modules Soldering and Cleaning Application Note (AP97-021EPS).
Parameter Min Typ Max Unit
Calculated MTBF (IO = 80% of IO, max; TC = 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(–) terminal; see Figure 20 and
Feature Descriptions.):
JAHWxxxD1 Preferred Logic:
Logic Low—Module On
Logic High—Module Off
JAHWxxxD 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 16.)
(IO = 80% of IO, max; VO within ±1% of steady state)
Von/off
Ion/off
Von/off
Ion/off
—
0
—
—
—
—
—
—
—
—
25
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
%VO, nom
Output Overvoltage Protection VO, sd 3.1* — 4.0* V
Overtemperature Protection
(See Feature Descriptions.)
TC—110— °C
Advance Data Sheet
April 2008
Lineage Power 5
dc-dc Converters; 36 to 75 Vdc Input, 2.5 Vdc Output; 25 W to 50 W
JAHW050G, JAHW075G, and JAHW100G Power Modules:
Characteristic Curves
The following figures provide typical characteristics for the power modules. The figures are identical for both on/off
configurations.
8-3104 (F)
Figure 1. Typical JAHW050G Input Characteristics
at Room Temperature
8-3105 (F)
Figure 2. Typical JAHW075G Input Characteristics
at Room Temperature
8-3106 (F)
Figure 3. Typical JAHW100G Input Characteristics
at Room Temperature
8-3107 (F)
Figure 4. Typical JAHW050G Converter Efficiency
vs. Output Current at Room Temperature
0.6
0.5
0
INPUT VOLTAGE, V
I
(V)
INPUT CURRENT, I
I
(A)
0.4
0.3
0.2
0.1
0
10 20 30 40 50 60 70 80
0.9
0.8
0.7
I
O
= 10 A
I
O
= 5.25 A
I
O
= 0.5 A
0.8
0.6
0
INPUT VOLTAGE, V
I
(V)
INPUT CURRENT, I
I
(A)
0.4
0.2
0
10 20 30 40 50 60 70 80
1.4
1.2
1
I
O
= 15 A
I
O
= 7.75 A
I
O
= 0.5 A
1.2
1
0
INPUT VOLTAGE, V
I
(V)
INPUT CURRENT, I
I
(A)
0.8
0.6
0.4
0.2
0
10 20 30 40 50 60 70 80
1.8
1.6
1.4
I
O
= 20 A
I
O
= 10.25 A
I
O
= 0.5 A
OUTPUT VOLTAGE, I
O
(A)
EFFICIENCY,
η
(
%
)
012345678
88
86
84
82
80
78
76
74
72
70
68
66
64
62
60 910
V
I
= 36 V
V
I
= 48 A
V
I
=75 A
6Lineage Power
Advance Data Sheet
April 2008
dc-dc Converters; 36 to 75 Vdc Input, 2.5 Vdc Output; 25 W to 50 W
JAHW050G, JAHW075G, and JAHW100G Power Modules:
Characteristic Curves (continued)
8-3108 (F)
Figure 5. Typical JAHW075G Converter Efficiency
vs. Output Current at Room Temperature
8-3109 (F)
Figure 6. Typical JAHW100G Converter Efficiency
vs. Output Current at Room Temperature
8-3110 (F)
Note: See Figure 18 for test conditions.
Figure 7. Typical JAHW050G Output Ripple Voltage
at Room Temperature and IO = IO, max
8-3111 (F)
Note: See Figure 18 for test conditions.
Figure 8. Typical JAHW075G Output Ripple Voltage
at Room Temperature and IO = IO, max
OUTPUT VOLTAGE, I
O
(A)
EFFICIENCY,
η
(
%
)
12345678
88
86
84
82
80
78
76
74
72
70
68
66
64
62
60 910 11 12 13 14 15
90
V
I
= 36 V
V
I
= 48 V
V
I
= 75 V
0
OUTPUT VOLTAGE, I
O
(A)
EFFICIENCY,
η
(
%
)
2 4 6 8 10 12 14 16
88
86
84
82
80
78
76
74
72
70
68
66
64
62
60 18 20
90
V
I
= 36 V
V
I
= 48 V
V
I
= 75 V
OUTPUT VOLTAGE, V
O
(V)
(20 mV/div)
TIME, t (1
μ
s/div)
V
I
= 36 V
V
I
= 48 V
V
I
= 75 V
OUTPUT VOLTAGE, V
O
(V)
(20 mV/div)
TIME, t (1
μ
s/div)
V
I
= 36 V
V
I
= 48 V
V
I
= 75 V
Advance Data Sheet
April 2008
Lineage Power 7
dc-dc Converters; 36 to 75 Vdc Input, 2.5 Vdc Output; 25 W to 50 W
JAHW050G, JAHW075G, and JAHW100G Power Modules:
Characteristic Curves (continued)
8-3112 (F)
Note: See Figure 18 for test conditions.
Figure 9. Typical JAHW100G Output Ripple Voltage
at Room Temperature and IO = IO, max
8-3113 (F)
Note: Tested with a 10 µF aluminum and a 1.0 µF tantalum capacitor
across the load.
Figure 10. Typical JAHW050G Transient Response
to Step Decrease in Load from 50% to
25% of Full Load at Room Temperature
and 48 Vdc Input (Waveform Averaged
to Eliminate Ripple Component.)
8-3114 (F)
Note: Tested with a 10 µF aluminum and a 1.0 µF tantalum capacitor
across the load.
Figure 11. Typical JAHW075G Transient Response
to Step Decrease in Load from 50% to
25% of Full Load at Room Temperature
and 48 Vdc Input (Waveform Averaged
to Eliminate Ripple Component.)
8-3115 (F)
Note: Tested with a 10 µF aluminum and a 1.0 µF tantalum capacitor
across the load.
Figure 12. Typical JAHW100G Transient Response
to Step Decrease in Load from 50% to
25% of Full Load at Room Temperature
and 48 Vdc Input (Waveform Averaged
to Eliminate Ripple Component.)
OUTPUT VOLTAGE, V
O
(V)
(20 mV/div)
TIME, t (1
μ
s/div)
V
I
= 36 V
V
I
= 48 V
V
I
= 75 V
OUTPUT VOLTAGE, V
O
(V)
(100 mV/div)
TIME, t (50
μ
s/div)
OUTPUT CURRENT, I
O
(A)
(1 A/div)
OUTPUT VOLTAGE, V
O
(V)
(100 mV/div)
TIME, t (50
μ
s/div)
OUTPUT CURRENT, IO(A)
(1 A/div)
OUTPUT VOLTAGE, V
O
(V)
(100 mV/div)
TIME, t (50
μ
s/div)
OUTPUT CURRENT, IO(A)
(1 A/div)
88 Lineage Power
Advance Data Sheet
April 2008
dc-dc Converters; 36 to 75 Vdc Input, 2.5 Vdc Output; 25 W to 50 W
JAHW050G, JAHW075G, and JAHW100G Power Modules:
Characteristic Curves (continued)
8-3116 (F)
Note: Tested with a 10 µF aluminum and a 1.0 µF tantalum capacitor
across the load.
Figure 13. Typical JAHW050G Transient 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.)
8-3117 (F)
Note: Tested with a 10 µF aluminum and a 1.0 µF tantalum capacitor
across the load.
Figure 14. Typical JAHW075G Transient 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.)
8-3118 (F)
Note: Tested with a 10 µF aluminum and a 1.0 µF tantalum capacitor
across the load.
Figure 15. Typical JAHW100G Transient 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.)
8-3119 (F)
Note: Tested with a 10 µF aluminum and a 1.0 µF tantalum capacitor
across the load.
Figure 16. JAHW100G Typical Start-Up from
Remote On/Off; IO = IO, max
OUTPUT VOLTAGE, V
O
(V)
(100 mV/div)
TIME, t (100
μ
s/div)
OUTPUT CURRENT, IO(A)
(1 A/div)
OUTPUT VOLTAGE, V
O
(V)
(100 mV/div)
TIME, t (50
μ
s/div)
OUTPUT CURRENT, I
O
(A)
(1 A/div)
OUTPUT VOLTAGE, V
O
(V)
(100 mV/div)
TIME, t (100
μ
s/div)
OUTPUT CURRENT, I
O
(A)
(1 A/div)
OUTPUT VOLTAGE, VO (V)
(1 V/div)
TIME, t (5 ms/div)
REMOTE ON/OFF
VON/OFF (V)
Lineage Power 9
Advance Data Sheet
April 2008 dc-dc Converters; 36 to 75 Vdc Input, 2.5 Vdc Output; 25 W to 50 W
JAHW050G, JAHW075G, and JAHW100G Power Modules:
Test Configurations
8-203 (F).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 (F).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 (F)
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.
Output Capacitance
High output current transient rate of change (high di/dt)
loads may require high values of output capacitance to
supply the instantaneous energy requirement to the
load. To minimize the output voltage transient drop dur-
ing this transient, low E.S.R. (equivalent series resis-
tance) capacitors may be required, since a high E.S.R.
will produce a correspondingly higher voltage drop dur-
ing the current transient.
Output capacitance and load impedance interact with
the power module’s output voltage regulation control
system and may produce and ‘unstable’ output condi-
tion for the required values of capacitance and E.S.R..
Minimum and maximum values of output capacitance
and of the capacitor’s associated E.S.R. may be dic-
tated, depending on the modules control system.
The process of determining the acceptable values of
capacitance and E.S.R. is complex and is load-depen-
dant. Lineage provides Web-based tools to assist the
power module end-user in appraising and adjusting the
effect of various load conditions and output capaci-
tances on specific power modules for various load con-
ditions.
1. Access the web at www.Lineagepower.com
2. Under Products, click on the DC-DC link
3. Under Design Tools, click on Application Tools Download
4. Various design tools will be found, including tools for determining
stability of power module systems§.
§Not available for all codes, Where not available, use minimum values in table
above
TO OSCILLOSCOPE
CURRENT
PROBE
BATTERY
LTEST
12 μH
CS 220 μF
ESR < 0.1 Ω
@ 20 °C, 100 kHz 33 μF
ESR < 0.7 Ω
@ 100 kHz
VI(+)
VI(–)
1.0 μFRESISTIVE
SCOPE
COPPER STRIP
10 μFLOAD
VO(+)
VO(–)
VI(+)
IIIO
SUPPLY
CONTACT
CONTACT AND
LOAD
SENSE(+)
VI(–)
VO(+)
VO(–)
SENSE(–)
RESISTANCE
DISTRIBUTION LOSSES
ηVO(+) – VO(–)[]IO
VI(+) – VI(–)[]II
------------------------------------------------
⎝⎠
⎛⎞
x 100 %=
1010 Lineage Power
Advance Data Sheet
April 2008
dc-dc Converters; 36 to 75 Vdc Input, 2.5 Vdc Output; 25 W to 50 W
JAHW050G, JAHW075G, and JAHW100G 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., UL60950, CSA C22.2 No. 60950-00, and VDE
0805 (IEC60950, 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:
nThe input source is to be provided with reinforced
insulation from any hazardous voltages, including the
ac mains.
nOne VI pin and one VO pin are to be grounded, or
both the input and output pins are to be kept floating.
nThe input pins of the module are not operator acces-
sible.
nAnother SELV reliability test is conducted on the
whole system, as required by the safety agencies, on
the combination of supply source and the subject
module to verify that under a single fault, hazardous
voltages do not appear at the module’s output.
Note: Do not ground either of the input pins of the
module without grounding one of the output pins.
This may allow a non-SELV voltage to appear
between the output pin and ground.
The power module has extra-low voltage (ELV) outputs
when all inputs are ELV.
The input to these units is to be provided with a maxi-
mum 15 A normal-blow fuse in the ungrounded lead.
Feature Descriptions
Overcurrent Protection
To provide protection in an output overload condition,
the unit is provided with internal shutdown and auto-
restart mechanism.
At the instance of current-limit inception, the module
enters a "hiccup" mode of operation whereby it shuts
down and automatically attempts to restart. As long as
the fault persists, the module remains in this mode.
The protection mechanism is such that the unit can
continue in this condition for a sufficient interval of time
until the fault is cleared.
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 20). A logic low is Von/off = 0 V to 1.2 V. The
maximum Ion/off during a logic low is 1 mA. The switch
should maintain a logic-low voltage while sinking 1 mA.
During a logic high, the maximum Von/off generated by
the power module is 15 V. The maximum allowable
leakage current of the switch at Von/off = 15 V is 50 µA.
If not using the remote on/off feature, do one of the
following to turn the unit on:
nFor negative logic, short ON/OFF pin to VI(–).
nFor positive logic, leave ON/OFF pin open.
8-720 (F).c
Figure 20. Remote On/Off Implementation
SENSE(+)
VO(+)
SENSE(–)
VO(–)
VI(–)
+
–
Ion/off
ON/OFF
VI(+)
LOAD
Von/off
Lineage Power 11
Advance Data Sheet
April 2008 dc-dc Converters; 36 to 75 Vdc Input, 2.5 Vdc Output; 25 W to 50 W
JAHW050G, JAHW075G, and JAHW100G 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.:
[VO(+) – VO(–)] – [SENSE(+) – SENSE(–)] ≤ 0.5 V
The voltage between the VO(+) and VO(–) terminals
must not exceed the minimum output overvoltage shut-
down value indicated in the Feature Specifications
table. 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
VO(+) and SENSE(–) to VO(–) at the module.
Although the output voltage can be increased by both
the remote sense and by the trim, the maximum
increase for the output voltage is not the sum of both.
The maximum increase is the larger of either the
remote sense or the trim. Consult the factory if you
need to increase the output voltage more than the
above limitation.
The amount of power delivered by the module is defined
as the voltage at the output terminals multiplied by the
output current. When using remote sense and trim, the
output voltage of the module can be increased, which at
the same output current would increase the power output
of the module. Care should be taken to ensure that the
maximum output power of the module remains at or
below the maximum rated power.
8-651 (F).m
Figure 21. Effective Circuit Configuration for
Single-Module Remote-Sense Operation
Output Voltage Set-Point Adjustment
(Trim)
Output voltage trim allows the user to increase or
decrease the output voltage set point of a module. This is
accomplished by connecting an external resistor between
the TRIM pin and either the SENSE(+) or SENSE(–) pins.
The trim resistor should be positioned close to the mod-
ule.
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 22). The following equa-
tion determines the required external-resistor value to
obtain a percentage output voltage change of Δ%.
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 (Radj-up), the output voltage set
point (VO, adj) increases (see Figure 24).
The following equation determines the required exter-
nal-resistor value to obtain a percentage output voltage
change of Δ%.
The test results for this configuration are displayed in
Figure 25.
The voltage between the VO(+) and VO(–) terminals
must not exceed the minimum output overvoltage shut-
down value indicated in the Feature Specifications
table. 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.
SENSE(+)
SENSE(–)
VI(+)
VI(–)
IOLOAD
CONTACT AND
SUPPLY II
CONTACT
VO(+)
VO(–)
DISTRIBUTION LOSSESRESISTANCE
Radj-down 1000
Δ%
-------------11–
⎝⎠
⎛⎞
kΩ=
Radj-up
VO nom,()1Δ%
100
--------
+()1.225–
1.225Δ%
--------------------------------------------------------------------------1000 11
–
⎝⎠
⎜⎟
⎜⎟
⎛⎞
kΩ=
1212 Lineage Power
Advance Data Sheet
April 2008
dc-dc Converters; 36 to 75 Vdc Input, 2.5 Vdc Output; 25 W to 50 W
JAHW050G, JAHW075G, and JAHW100G Power Modules:
Feature Descriptions (continued)
Output Voltage Set-Point Adjustment
(Trim) (continued)
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.
8-748 (F).b
Figure 22. Circuit Configuration to Decrease
Output Voltage
8-2470 (F)
Figure 23. Resistor Selection for Decreased
Output Voltage
8-715 (F).b
Figure 24. Circuit Configuration to Increase
Output Voltage
8-2469 (F)
Figure 25. Resistor Selection for Increased Output
Voltage
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, the module will shut down
and restart automatically. A latch-off option is also
available.*
Overtemperature Protection
To provide protection in a fault condition, the unit is
equipped with an overtemperature circuit. In the event
of such a fault, the module enters into an auto-restart
“hiccup” mode with low output voltage until the fault is
removed. Recovery from the overtemperature protec-
tion is automatic after the unit cools below the overtem-
perature protection threshold. A latch-off option is also
available.*
VI
(+)
VI(–)
ON/OFF
CASE
VO(+)
VO(–)
SENSE(+)
TRIM
SENSE(–)
Radj-down
RLOAD
10 20 30 40
10k
100k
0
1M
% CHANGE IN OUTPUT VOLTAGE (Δ%)
ADJUSTMENT RESISTOR VALUE (Ω)
VI
(+)
VI(–)
ON/OFF
CASE
VO(+)
VO(–)
SENSE(+)
TRIM
SENSE(–)
Radj-up
RLOAD
246810
100k
1M
10M
0
100M
% CHANGE IN OUTPUT VOLTAGE (Δ%)
ADJUSTMENT
RESISTOR
VALUE
(
Ω
)
Lineage Power 13
Advance Data Sheet
April 2008 dc-dc Converters; 36 to 75 Vdc Input, 2.5 Vdc Output; 25 W to 50 W
JAHW050G, JAHW075G, and JAHW100G 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 (TC)
occurs at the position indicated in Figure 26.
8-716 (F).h
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.
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
exceeding the maximum case temperature versus local
ambient temperature (TA) for natural convection
through 3 m/s (600 ft./min.).
Note that the natural convection condition was 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
JAHW100G operating at VI = 48 V, an output current of
20 A, and a maximum ambient temperature of 55 °C?
Solution
Given: VI = 48 V
IO = 20 A
TA = 55 °C
Determine PD (Use Figure 30.):
PD = 6.3 W
Determine airflow (v) (Use Figure 27.):
v = 0.36 m/s (70 ft./min.)
8-3120 (F)
Figure 27. Forced Convection Power Derating with
No Heat Sink; Either Orientation
MEASURE CASE
ON/OFF
CASE
+SEN
TRIM
–SEN
29.0
(1.14)
30.5
TEMPERATURE HERE
VO(+)
VO(–)
VI(+)
VI(–)
(1.20)
0
LOCAL AMBIENT TEMPERATURE, T
A
(
°
C)
POWER DISSIPATION, P
D
(W)
10 20 30 40 50 60 70 80
12
9
6
3
60 90 100
3.0 m/s (600 ft./min.)
2.0 m/s (400 ft./min.)
1.0 m/s (200 ft./min.)
0.1 m/s (20 ft./min.)
NATURAL CONVECTION
1414 Lineage Power
Advance Data Sheet
April 2008
dc-dc Converters; 36 to 75 Vdc Input, 2.5 Vdc Output; 25 W to 50 W
JAHW050G, JAHW075G, and JAHW100G Power Modules:
Thermal Considerations (continued)
Heat Transfer Without Heat Sinks (continued)
8-3121 (F)
Figure 28. JAHW050G Power Dissipation vs.
Output Current at 25 °C
8-3122 (F)
Figure 29. JAHW075G Power Dissipation vs.
Output Current at 25 °C
8- 3123 (F)
Figure 30. JAHW100G Power Dissipation vs.
Output Current at 25 °C
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 (ΔTC, 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 31. These curves were
obtained by experimental testing of heat sinks, which
are offered in the product catalog.
0
OUTPUT CURRENT, I
O
(A)
POWER DISSIPATION, P
D
(W)
2468
8
10
7
6
5
4
3
2
1
0
V
I
= 75 V
V
I
= 48 V
V
I
= 36 V
0
OUTPUT CURRENT, I
O
(A)
POWER DISSIPATION, P
D
(W)
2468
8
10
7
6
5
4
3
2
1
0
1 3 5 7 9 11 12 13 14 1
5
V
I
= 75 V
V
I
= 48 V
V
I
= 36 V
0
OUTPUT CURRENT, I
O
(A)
POWER DISSIPATION, P
D
(W)
4 8 12 16
8
20
7
6
5
4
3
2
1
0
2 6 10 14 18
9
V
I
= 75 V
V
I
= 48 V
V
I
= 36 V
θca ΔTCmax,
PD
---------------------TCTA–()
PD
------------------------
==
Lineage Power 15
Advance Data Sheet
April 2008 dc-dc Converters; 36 to 75 Vdc Input, 2.5 Vdc Output; 25 W to 50 W
JAHW050G, JAHW075G, and JAHW100G Power Modules:
Thermal Considerations (continued)
Heat Transfer with Heat Sinks (continued)
8-3124 (F)
Figure 31. 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 31 had a
thermal-conductive dry pad between the case and the
heat sink to minimize contact resistance. The use of
Figure 31 is shown in the following example.
Example
If an 85 °C case temperature is desired, what is the
minimum airflow necessary? Assume the JAHW100G
module is operating at VI = 48 V and an output current
of 20 A, maximum ambient air temperature of 55 °C,
and the heat sink is 1/4 inch.
Solution
Given: VI = 48 V
IO = 20 A
TA = 55 °C
TC = 85 °C
Heat sink = 1/4 inch.
Determine PD by using Figure 30:
PD = 6.3 W
Then solve the following equation:
Use Figure 31 to determine air velocity for the 1/4 inch
heat sink.
The minimum airflow necessary for the JAHW100G
module is 0.61 m/s (120 ft./min.).
6
5
0.0
AIR VELOCITY, m/s (ft./min.)
CASE-TO-AMVIENT THERMAL
4
3
2
1
0
0.5 1.0 1.5 2.0 2.5 3.0
9
8
7
1 IN. HEAT SINK
1/2 IN. HEAT SINK
1/4 IN. HEAT SINK
(0) (100) (200) (300) (400) (500) (600
)
RESISTANCE,
θ
ca
(
°
C/W)
NO HEAT SINK
T
CASE
(MAX) = 100
°
C
MEASURED AT CASE CENTER
θca TCTA–()
PD
------------------------
=
θca 85 55–()
6.3
------------------------
=
θca 4.8 °C/W=
1616 Lineage Power
Advance Data Sheet
April 2008
dc-dc Converters; 36 to 75 Vdc Input, 2.5 Vdc Output; 25 W to 50 W
JAHW050G, JAHW075G, and JAHW100G 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) as shown in Figure 32.
8-1304 (F).e
Figure 32. 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.
EMC Considerations
For assistance with designing for EMC compliance,
please refer to the FLTR100V10 data sheet
(DS99-294EPS).
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
(DS99-294EPS).
PD
TCTSTA
θcs θsa
θsa TCTA–()
PD
-------------------------θcs–=
Lineage Power 17
Advance Data Sheet
April 2008 dc-dc Converters; 36 to 75 Vdc Input, 2.5 Vdc Output; 25 W to 50 W
JAHW050G, JAHW075G, and JAHW100G 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 (F).m
* Side label includes Lineage name, product designation, safety agency markings, input/output voltage and current ratings, and bar code.
† The case pin may be 1.3(0.05) longer than the other pins.
57.9 (2.28)
61.0
(2.40)
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)
4.7
(0.19)
48.26 (1.900)
STANDOFF,
4 PLACES
7.1 (0.28)
7.1
(0.28)
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(–)
CASE
ON/OFF
VI(+)
VO(–)
VO(+)
–SEN
TRIM
+SEN
18 Lineage Power
Advance Data Sheet
April 2008
dc-dc Converters; 36 to 75 Vdc Input, 2.5 Vdc Output; 25 W to 50 W
JAHW050G, JAHW075G, and JAHW100G Power Modules:
Recommended Hole Pattern
Component-side footprint.
Dimensions are in millimeters and (inches).
8-716 (F).m
Ordering Information
Table 5. Device Codes
Optional features can be ordered using the suffixes shown in Table 6. The suffixes follow the last letter of the
device code and are placed in descending order. For example, the device codes for a JAHW075G module with the
following options are shown below:
Positive logic JAHW075G
Negative logic JAHW075G1
Table 6. Device Options
Input
Voltage
Output
Voltage
Output
Power
Remote On/Off
Logic
Device
Code Comcode
48 V 2.5 V 66 W Negative JAHW100G1 108593690
Option Suffix
Negative remote on/off logic 1
Positive remote on/off logic —
Latching Protection 5
10.16
(0.400)
10.16
(0.400)
12.7 (0.50)
4.7
(0.19)
MODULE OUTLINE
5.1 (0.20)
48.26 (1.900)
TERMINALS
48.3 (1.90)
MOUNTING HOLES
57.9 (2.28)
50.8
(2.00) 25.40
(1.000)
35.56
(1.400)
61.0
(2.40)
35.56
(1.400)
25.40
(1.000)
17.78
(0.700)
TRIM
VI(+)
ON/OFF
CASE −SEN
+SEN
VO(+)
VI(−)VO(−)
Note: Legacy device codes may contain a -B option suffix to indicate 100% factory Hi-Pot tested to the isolation voltage specified in the Abso-
lute Maximum Ratings table. The 100% Hi-Pot test is now applied to all device codes, with or without the -B option suffix. Existing comcodes for
devices with the -B suffix are still valid; however, no new comcodes for devices containing the -B suffix will be created.
Advance Data Sheet
April 2008
dc-dc Converters; 36 to 75 Vdc Input, 2.5 Vdc Output; 25 W to 50 W
JAHW050G, JAHW075G, and JAHW100G Power Modules:
April 2008
FDS01-063EPS (Replaces FDS01-062EPS)
World Wide Headquarters
Lineage Power Corporation
3000 Skyline Drive, Mesquite, TX 75149, USA
+1-800-526-7819
(Outside U.S.A.: +1- 97 2-2 84 -2626)
www.line agepower.com
e-m ail: tech support1@ linea gep ower.com
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Tel: +65 6 41 6 4283
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Lineage Power reserves the right to make changes to the product(s) or information contained herein without notice. No liability is assumed as a result of their use or
application. No rights under any patent accompany the sale of any such product(s) or information.
© 2008 Lineage Power Corporation, (Mesquite, Texas) All International Rights Reserved.
