Data Sheet
April 2008
JAHW050A, JAHW075A and JAHW100A Power Modules:
dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 to 100 W
Applications
nDistributed power architectures
nWorkstations
nComputer equipment
nCommunications 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
nHigh efficiency: 90% typical
nLow output noise
nConstant frequency
nIndustry-standard pinout
nMetal baseplate
n2:1 input voltage range
nOvercurrent protection (hiccup mode)
nRemote on/off
nAdjustable output voltage
nRemote sense
nOutput overvoltage protection (hiccup mode)
nOvertemperature protection (hiccup mode)
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‡ 22.2 No. 60950-00
Certified, and VDE § 0805 (IEC60950, IEC950)
Licensed
nCE mark meets 73/23/EEC and 93/68/EEC
directives**
The JAHW Series Power Modules use advanced, surface-
mount technology and deliver high-quality, efficient, and
compact dc-dc conversion.
Description
The JAHW050A, JAHW075A and JAHW100A 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 50 W to 100 W at a typical full-load efficiency of 90%.
The sealed modules offer a 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.
* 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 Association.
§ 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
Data Sheet
April 2008
dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 to 100 W
JAHW050A, JAHW075A and JAHW100A 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 (for 1 minute) — — 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):
JAHW050A (See Figure 1.)
JAHW075A (See Figure 2.)
JAHW100A (See Figure 3.)
II, max
II, max
II, max
—
—
—
—
—
—
1.7
2.6
3.5
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 19.)
II—5—mAp-p
Input Ripple Rejection (120 Hz) — — 60 — dB
Lineage Power 3
Data Sheet
April 2008 dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 to 100 W
JAHW050A, JAHW075A and JAHW100A 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 4.92 5.0 5.08 Vdc
Output Voltage
(Over all operating input voltage, resistive load,
and temperature conditions until end of life. See
Figure 21.)
All VO4.85 — 5.15 Vdc
Output Regulation:
Line (VI = 36 V to 75 V)
Load (IO = IO, min to IO, max)
Temperature (TC = –40 °C to +100 °C)
All
All
All
—
—
—
—
—
—
0.01
0.05
15
0.1
0.2
50
%VO
%VO
mV
Output Ripple and Noise Voltage
(See Figure 20.):
RMS
Peak-to-peak (5 Hz to 20 MHz)
All
All
—
—
—
—
—
—
50
100
mVrms
mVp-p
External Load Capacitance (electrolytic) All — 0‡—* µF
Output Current
(At IO < IO, min, the modules may exceed output
ripple specifications.)
JAHW050A
JAHW075A
JAHW100A
IO
IO
IO
0.5
0.5
0.5
—
—
—
10
15
20
A
A
A
Output Current-limit Inception
(VO = 90% of VO, nom)
JAHW050A
JAHW075A
JAHW100A
IO, cli
IO, cli
IO, cli
—
—
—
12
18
22
—
—
—
A
A
A
Output Short-circuit Current (VO = 250 mV) All — 0 — 23 A
Efficiency (VI = 48 V; IO = IO, max; TC = 70 °C) JAHW050A
JAHW075A
JAHW100A
η
η
η
—
—
—
89.5
90.4
91
—
—
—
%
%
%
Switching Frequency All — — 340 — kHz
Dynamic Response
(ΔIO/Δt = 1 A/10 µs, VI = 48 V, TC = 25 °C;
tested with a 10 µF tantalum and a 1.0 µF
ceramic 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
—
—
—
—
—
—
—
—
5
200
5
200
—
—
—
—
%VO, set
µs
%VO, set
µs
Parameter Min Typ Max Unit
Isolation Capacitance — 2500 — pF
Isolation Resistance 10 — — MΩ
4Lineage Power
Data Sheet
April 2008
dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 to 100 W
JAHW050A, JAHW075A and JAHW100A Power Modules:
General Specifications
Feature Specifications
Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature
conditions. See Feature Descriptions for additional information.
* These are 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 (AP01-056EPS).
Parameter Min Typ Max Unit
Calculated MTBF (IO = 80% of IO, max; TC = 40 °C) 2,000,000 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 22 and
Feature Descriptions.):
JAHWxxxA1 Preferred Logic:
Logic Low—Module On
Logic High—Module Off
JAHWxxxA 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
—
—
—
—
—
—
—
—
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
%VO, nom
Output Overvoltage Protection VO, sd 5.9* — 7.0* V
Overtemperature Protection
(See Feature Descriptions.)
TC—110— °C
Data Sheet
April 2008
Lineage Power 5
dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 to 100 W
JAHW050A, JAHW075A and JAHW100A Power Modules:
Characteristic Curves
The following figures provide typical characteristics for the power modules. The figures are identical for both on/off
configurations.
8-2241 (F)
Figure 1. Typical JAHW050A Input Characteristics
at Room Temperature
8-2075 (F)
Figure 2. Typical JAHW075A Input Characteristics
at Room Temperature
1-0462
Figure 3. Typical JAHW100A Input Characteristics
at Room Temperature
8-2242 (F)
Figure 4. Typical JAHW050A Converter Efficiency
vs. Output Current at Room Temperature
1.8
10
INPUT VOLTAGE, VI (V)
INPUT CURRENT, II (A)
15 20 25 30 35 40 45 50
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
55 65 70 75
05 60
IO = 10 A
IO = 5 A
IO = 0.5 A
3
10
INPUT VOLTAGE, VI (V)
INPUT CURRENT, II (A)
15 20 25 30 35 40 45 50
2.5
2
1.5
1
0.5
0
55 65 70 75
05 60
IO = 15 A
IO = 7.5 A
IO = 0.75 A
0
0.5
1
1.5
2
2.5
3
3.5
4
0 10203032333545556575
INPUT VOLTAGE
,
V
I
(
V
)
INPUT CURRENT, I
I
(A)
I
O
= 20 A
I
O
= 10 A
I
O
= 1 A
91
4
OUTPUT CURRENT, IO (A)
EFFICIENCY, η (%)
5678 1039
89
88
87
86
85
84
83
82
81
90
VI = 75 V
VI = 48 V
VI = 36 V
6Lineage Power
Data Sheet
April 2008
dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 to 100 W
JAHW050A, JAHW075A and JAHW100A Power Modules:
Characteristic Curves (continued)
8-2076 (F)
Figure 5. Typical JAHW075A Converter Efficiency
vs. Output Current at Room Temperature
1-0463
Figure 6. Typical JAHW100A Converter Efficiency
vs. Output Current at Room Temperature
8-3201 (F)
Note: See Figure 20 for test conditions.
Figure 7. Typical JAHW050A Output Ripple Voltage
at Room Temperature, IO = IO, max
8-1884 (F)
Note: See Figure 20 for test conditions.
Figure 8. Typical JAHW075A Output Ripple Voltage
at Room Temperature, IO = IO, max
91
4
OUTPUT CURRENT, IO (A)
EFFICIENCY, η (%)
5678 10
39
89
88
87
86
85
84
83
82
81
90
11 12 13 14 15
VI = 75 V
VI = 48 V
VI = 36 V
50
55
60
65
70
75
80
85
90
95
1 2 3 4 5 6 7 8 9 1011121314151617181920
OUTPUT CURRENT, I
O
= (A)
EFFICIENCY, η (%)
V
I
= 36 V
V
I
= 48 V
V
I
= 75 V
OUTPUT VOLTAGE, VO (V)
(50 mV/div)
TIME, t (2 μs/div)
VI = 36 V
VI = 48 V
VI = 75 V
OUTPUT VOLTAGE, VO (V)
(50 mV/div)
TIME, t (2 μs/div)
VI = 36 V
VI = 48 V
VI = 75 V
Data Sheet
April 2008
Lineage Power 7
dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 to 100 W
JAHW050A, JAHW075A and JAHW100A Power Modules:
Characteristic Curves (continued)
1-0461
Note: See Figure 20 for test conditions.
Figure 9. Typical JAHW100A Output Ripple Voltage
at Room Temperature, IO = IO, max
8-3203 (F)
Note: Tested with a 10 µF tantalum and a 1.0 µF ceramic capacitor
across the load.
Figure 10. Typical JAHW050A Transient Response
to Step Increase in Load from 50% to 75%
of IO, max at Room Temperature and 48 Vdc
Input (Waveform Averaged to Eliminate
Ripple Component.)
8-1886 (F)
Note: Tested with a 10 µF tantalum and a 1.0 µF ceramic capacitor
across the load.
Figure 11. Typical JAHW075A Transient Response
to Step Increase in Load from 50% to 75%
of IO, max at Room Temperature and 48 Vdc
Input (Waveform Averaged to Eliminate
Ripple Component.)
1-0456
Note: Tested with a 10 µF tantalum and a 1.0 µF ceramic capacitor
across the load.
Figure 12.Typical JAHW100A Transient Response
to Step Increase in Load from 50% to 75%
of IO, max at Room Temperature and 48 Vdc
Input (Waveform Averaged to Eliminate
Ripple Component.)
2
2 µs
50 mV
A:M1
2 µs
50 mV
B:M2
2 µs
50 mV
2 µs BWL
500 MS / s
B VIN =
3
A VIN =
4
2 VIN =
7
OUTPUT VOLTAGE, VO (V)
(100 mV/div)
TIME, t (50 μs/div)
OUTPUT CURRENT, IO (A)
(5 A/div)
7.5 A
5.0 A
OUTPUT VOLTAGE, VO (V)
(100 mV/div)
TIME, t (100 μs/div)
OUTPUT CURRENT, IO (A)
(5 A/div)
OUTPUT VOLTAGE,
V
O
(V) (0.5 V/
d
OUTPUT CURRENT,
I
O
(A) (2 A/div)
TIME, t (0.1 ms/div)
88 Lineage Power
Data Sheet
April 2008
dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 to 100 W
JAHW050A, JAHW075A and JAHW100A Power Modules:
Characteristic Curves (continued)
8-3205 (F)
Note: Tested with a 10 µF tantalum and a 1.0 µF ceramic capacitor
across the load.
Figure 13. Typical JAHW050A Transient Response
to Step Decrease in Load from 50% to
25% of IO, max at Room Temperature and
48 Vdc Input (Waveform Averaged to
Eliminate Ripple Component.)
8-1885 (F)
Note: Tested with a 10 µF tantalum and a 1.0 µF ceramic capacitor
across the load.
Figure 14. Typical JAHW075A Transient Response
to Step Decrease in Load from 50% to
25% of IO, max at Room Temperature and
48 Vdc Input (Waveform Averaged to
Eliminate Ripple Component.)
1-0457
Note: Tested with a 10 µF tantalum and a 1.0 µF ceramic capacitor
across the load.
Figure 15.Typical JAHW100A Transient Response
to Step Decrease in Load from 75% to
50% of IO, max at Room Temperature and
48 Vdc Input (Waveform Averaged to
Eliminate Ripple Component.)
8-1143 (F).a
Note: Tested with a 10 µF tantalum and a 1.0 µF ceramic capacitor
across the load.
Figure 16. Typical Start-Up from Remote On/Off;
IO = IO, max
OUTPUT VOLTAGE, VO (V)
(100 mV/div)
TIME, t (50 μs/div)
OUTPUT CURRENT, IO (A)
(5 A/div)
5.0 A
2.5 A
OUTPUT VOLTAGE, VO (V)
(100 mV/div)
TIME, t (50 μs/div)
OUTPUT CURRENT, IO (A)
(5 A/div)
OUTPUT VOLTAGE,
V
O
(V) (0.5 V/
d
OUTPUT CURRENT,
I
O
(A) (2 A/div)
TIME, t (0.1 ms/div)
REMOTE ON/OFF PIN,
VON/OFF (V)
TIME, t (2 μs/div)
OUTPUT VOLTAGE, VO (V)
(1 V/div)
0
0
Lineage Power 9
Data Sheet
April 2008 dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 to 100 W
JAHW050A, JAHW075A and JAHW100A Power Modules:
Characteristic Curves (continued)
1-0458
Figure 17.Typical JAHW100A Startup at applied VIN
1-0459
Figure 18.Typical JAHW100A Remote Startup
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 19. 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 20. 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 21. Output Voltage and Efficiency
Measurement Test Setup
INPUT VOLTAGE,
V
I
(V) (10 V/d
i
OUTPUT VOLTAGE,
V
O
(V) (1 V/div)
TIME, t (20 ms/div)
REMOTE ON/OFF,
V
ON/OFF
(V) (1 V/div)
OUTPUT VOLTAGE,
V
O
(V) (1 V/div)
TIME, t (5 ms/div)
V
IN
= 48 V
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
------------------------------------------------
⎝⎠
⎛⎞
x100=%
1010 Lineage Power
Data Sheet
April 2008
dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 to 100 W
JAHW050A, JAHW075A and JAHW100A Power Modules:
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 19, 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
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 shut down 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.
A latch-off option is also available
Lineage Power 11
Data Sheet
April 2008 dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 to 100 W
JAHW050A, JAHW075A and JAHW100A Power Modules:
Feature Descriptions (continued)
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 22). 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 22. 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(–)] ≤ 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).
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 23. Effective Circuit Configuration for
Single-Module Remote-Sense Operation
SENSE(+)
VO(+)
SENSE(–)
VO(–)
VI(–)
+
–
Ion/off
ON/OFF
VI(+)
LOAD
Von/off
SENSE(+)
SENSE(–)
VI(+)
VI(–)
IOLOAD
CONTACT AND
SUPPLY II
CONTACT
VO(+)
VO(–)
DISTRIBUTION LOSSESRESISTANCE
1212 Lineage Power
Data Sheet
April 2008
dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 to 100 W
JAHW050A, JAHW075A and JAHW100A Power Modules:
Feature Descriptions (continued)
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 24). 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 25. 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 26).
The following equation determines the required exter-
nal-resistor value to obtain a percentage output voltage
change of Δ%.
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).
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.
8-748 (F).b
Figure 24. Circuit Configuration to Decrease
Output Voltage
8-3207 (F)
Figure 25. Resistor Selection for Decreased
Output Voltage
8-715 (F).b
Figure 26. Circuit Configuration to Increase
Output Voltage
Radj-down 1000
Δ%
-------------11–
⎝⎠
⎛⎞
kΩ=
Radj-up
VO nom,()1Δ%
100
--------
+()1.225–
1.225Δ%
--------------------------------------------------------------------------1000 11
–
⎝⎠
⎜⎟
⎜⎟
⎛⎞
kΩ=
VI
(+)
VI(–)
ON/OFF
CASE
VO(+)
VO(–)
SENSE(+)
TRIM
SENSE(–)
Radj-down
RLOAD
1M
10
% CHANGE IN OUTPUT VOLTAGE (Δ%)
ADJUSTMENT RESISTOR VALUE (Ω)
20 30 40
100k
10k
0
VI
(+)
VI(–)
ON/OFF
CASE
VO(+)
VO(–)
SENSE(+)
TRIM
SENSE(–)
Radj-up
RLOAD
Lineage Power 13
Data Sheet
April 2008 dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 to 100 W
JAHW050A, JAHW075A and JAHW100A Power Modules:
Feature Descriptions (continued)
Output Overvoltage Protection
The output overvoltage protection consists of circuitry
that monitors the voltage on the output terminals. If the
voltage on the output terminals exceeds the overvolt-
age protection threshold, then the module will shut
down and attempt to restart. A latch-ff option is also
available.*
Overtemperature Protection
To provide protection in a fault condition, the unit is
equipped with an overtemperature circuit. In a 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-ff option is also
available.*
* Protection latch-off causes the ouput to be disabled until input
power is recyeled or until the remote on-off is recycled off-on.
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 27.
8-716 (F).h
Note: Top view, pin locations are for reference only. Measurements
shown in millimeters and (inches).
Figure 27. 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 28 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 Figure 28 is
shown in the following example.
Example
What is the minimum airflow necessary for a
JAHW075A operating at VI = 55 V, an output current of
15 A, and a maximum ambient temperature of 55 °C?
Solution
Given: VI = 55 V
IO = 15 A
TA = 55 °C
Determine PD (Use Figure 31.):
PD = 8 W
Determine airflow (v) (Use Figure 28.):
v = 0.5 m/s (100 ft./min.)
MEASURE CASE
ON/OFF
CASE
+ SEN
TRIM
– SEN
29.0
(1.14)
30.5
TEMPERATURE HERE
V
O
(+)
V
O
(–)
V
I
(+)
V
I
(–)
(1.20)
1414 Lineage Power
Data Sheet
April 2008
dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 to 100 W
JAHW050A, JAHW075A and JAHW100A Power Modules:
Thermal Considerations (continued)
Heat Transfer Without Heat Sinks (continued)
8-2236 (F)
Figure 28. JAHW050A and JAHW075A Forced
Convection Power Derating with No Heat
Sink; Either Orientation
1-0464
Figure 29.JAHW100A Forced Convection Power
Derating with No Heat Sink; Either
Orientation
8-2243 (F)
Figure 30. JAHW050A Power Dissipation vs.
Output Current at 25 °C
8-2238 (F)
Figure 31. JAHW075A Power Dissipation vs.
Output Current at 25 °C
12
10
LOCAL AMBIENT TEMPERATURE, TA (°C)
POWER DISSIPATION, PD (W)
20 30 40 50 60 70 80 90
9
6
3
0
100
0
2.0 m/s (400 ft./min.)
3.0 m/s (600 ft./min.)
4.0 m/s (800 ft./min.)
1.0 m/s (200 ft./min.)
0.1 m/s (20 ft./min.)
NATURAL CONVECTION
0
2
4
6
8
10
12
14
16
18
20
0 102030405060708090100
LOCAL AMBIENT TEMPERATURE, T
A
(°C )
POWER DISSIPATION, P
D
(W )
4.0 m /s (800 ft./m in.)
3.0 m /s (600 ft./m in.)
2.0 m /s (400 ft./m in.)
1.0 m /s (200 ft./m in.)
0.5 m /s (100 ft./m in.)
NATURAL CONVECTION
4
OUTPUT CURRENT, I
O
(A)
POWER DISSIPATION, PD (W)
5678 103 9
8
7
6
5
4
3
210
V
I
= 36 V
V
I
= 48 V
V
I
= 75 V
10
4
OUTPUT CURRENT, IO (A)
POWER DISSIPATION, PD (W)
5678 103 9
8
7
6
5
4
3
9
11 12 13 14 15210
VI = 75 V
VI = 48 V
VI = 36 V
Lineage Power 15
Data Sheet
April 2008 dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 to 100 W
JAHW050A, JAHW075A and JAHW100A Power Modules:
Thermal Considerations (continued)
Heat Transfer without Heat Sinks (continued)
1-0465
Figure 32.JAHW100A 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 27. Case-to-ambient thermal resis-
tance vs. airflow is shown, for various heat sink config-
urations and heights, in Figure 33. These curves were
obtained by experimental testing of heat sinks, which
are offered in the product catalog.
8-2239 (F)
Figure 33. JAHW050A and JAHW075A 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 33 had a
thermal-conductive dry pad between the case and the
heat sink to minimize contact resistance. The use of
Figure 33 is shown in the following example.
0
2
4
6
8
10
12
14
1 2 3 4 5 6 7 8 9 101112131415 1617181920
OUTPUT CURRENT, I
O
(
A
)
POWER DISSIPATION, P (W)
V
I
= 36 V
V
I
= 48 V
V
I
= 75 V
θca ΔTCmax,
PD
---------------------TCTA–()
PD
------------------------
==
2.0
AIR VELOCITY, m/s (ft./min.)
CASE-TO-AMBIENT THERMAL
2.5 3.01.5
8.00
7.00
1.00.50
6.00
5.00
4.00
3.00
2.00
1.00
0.00
RESISTANCE,
θ
ca (
°
C/W)
(100) (200) (300) (400) (500) (600)
1 1/2 IN. HEAT SINK
1 IN. HEAT SINK
1/2 IN. HEAT SINK
1/4 IN. HEAT SINK
NO HEAT SINK
16 Lineage Power
Data Sheet
April 2008
dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 to 100 W
JAHW050A, JAHW075A and JAHW100A Power Modules:
Thermal Considerations (continued)
Heat Transfer with Heat Sinks (continued)
Example
If an 85 °C case temperature is desired, what is the
minimum airflow necessary? Assume the JAHW075A
module is operating at VI = 55 V and an output
current of 15 A, maximum ambient air temperature of
55 °C, and the heat sink is 1/2 inch.
Solution
Given: VI = 55 V
IO = 15 A
TA = 55 °C
TC = 85 °C
Heat sink = 1/2 inch
Determine PD by using Figure 31:
PD = 8 W
Then solve the following equation:
Use Figure 33 to determine air velocity for the 1/2 inch
heat sink.
The minimum airflow necessary for the JAHW075A
module is 0.5 m/s (100 ft./min.).
Custom Heat Sinks
A more detailed model can be used to determine the
required thermal resistance of a heat sink to provide
necessary cooling. The total module resistance can be
separated into a resistance from case-to-sink (θcs) and
sink-to-ambient (θsa) as shown in Figure 34.
8-1304 (F).e
Figure 34. 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
(FDS01-043EPS).
Layout Considerations
Copper paths must not be routed beneath the power
module standoffs. For additional layout guidelines,
refer to the FLTR100V10 data sheet (FDS01-043EPS).
θca TCTA–()
PD
------------------------
=
θca 85 55–()
8
------------------------
=
θca 3.8 °C/W=
PD
TCTSTA
θcs θsa
θsa TCTA–()
PD
-------------------------θcs–=
Lineage Power 17
Data Sheet
April 2008 dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 to 100 W
JAHW050A, JAHW075A and JAHW100A 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).k
* 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
1818 Lineage Power
Data Sheet
April 2008
dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 to 100 W
JAHW050A, JAHW075A and JAHW100A Power Modules:
Recommended Hole Pattern
Component-side footprint.
Dimensions are in millimeters and (inches).
8-716 (F).k
Ordering Information
Table 4. Device Codes
Optional features can be ordered using the suffixes shown in Table 5. The suffixes follow the last letter of the
device code and are placed in descending order. For example, the device codes for a JAHW075A module with the
following options are shown below:
Positive logic JAHW075A
Negative logic JAHW075A1
Table 5. Device Options
Input
Voltage
Output
Voltage
Output
Power
Remote On/Off
Logic
Device
Code Comcode
48 V 5 V 75 W Negative JAHW075A1 108219312
48 V 5 V 75 W Negative JAHW075A61 108600610
Option Device Code 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) 17.78
(0.700)
25.40
(1.000)
35.56
(1.400)
61.0
(2.40)
VI(+)
ON/OFF
CASE
VI(–) VO(–)
+SEN
TRIM
–SEN
VO(+)
35.56
(1.400)
25.40
(1.000)
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.
Data Sheet
April 2008
dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 to 100 W
JAHW050A, JAHW075A and JAHW100A Power Modules:
April 2008
FDS01-088EPS (Replaces FDS01-087EPS)
World W ide Headquarters
Lin eage Power Co rpor ation
30 00 Skyline Drive, Mesquite, TX 75149, USA
+1-800-526-7819
(Outsid e U.S.A .: +1- 97 2-2 84 -2626)
www.line agepower.com
e-m ail: techsupport1@lineagepower.com
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Tel: +65 641 6 4283
Eu rope, M iddle-East an d Afric a He adqu arters
Tel: +49 8 9 6089 286
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Tel: +91 80 28411633
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.
