Data Sheet
December 19 99
LC/LW005-Series Power Modules:
18 Vdc to 36 Vdc or 36 Vdc to 75 Vdc Inputs, 5 W
The LC/LW 005-Series Power Modules use advanced, surface-
mount technol ogy a nd de liver high-quality, compact , dc-dc
con version at an economical price.
Applications
■Computer equipment
■Communications equipment
■Distributed power architectures
Options
■Po sitive remote on-off logic
■Short pins: 2.8 mm ± 0.25 mm
(0.110 in. ± 0.010 in.)
■Synchronization
■Tight output voltage tolerance
Features
■Low profile: 10 .2 mm x 25.4 mm x 32 mm
(0.400 in. x 1 in. x 1.26 in.) with standoffs
(9.78 mm (0.385 in.) with standoffs recessed)
■Wide input voltage range: 18 Vdc to 36 Vdc or
36 Vdc to 75 Vdc
■Input-to-output isolation up to 1500 V
■Operating case temperature range: –40 °C to
+105 °C
■Overcurrent protection, unlimited duration
■Output overvoltage protection
■Undervoltage lockout
■
UL
*
1950 Recognized,
CSA
† C22.2 No . 950-95
Certified,
VDE
‡ 0805 (EN60950, IEC950) Licensed
■CE mark meets 73/23/EEC and 93/68/EEC
directives‡
■Within FCC Class A radiated limits
*
UL
is a registered trademark of Underwriters Laboratories, Inc.
†
CSA
is a registered trademark of Canadian Standards Associa-
tion.
‡
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 equip-
ment should be followed. (The CE mark is placed on selected
products.)
Description
The LC/LW005-Series Power Modules are low-profile, dc-dc converters that operate over an input voltage
range of 18 Vdc to 36 Vdc or 36 Vdc to 75 Vdc and provide a precisely regulated output. The output is isolated
from the input, allowing versatile polarity configurations and grounding connections. The modules have a maxi-
mum power rating of 5 W and efficiencies greater than 75%. Built-in filtering f or both input and output minimizes
the need for external filtering.
2Tyco Electronics Corp.
Data Sheet
December 1999
18 Vdc to 36 Vdc or 36 Vdc to 75 Vdc Inputs, 5 W
LC/LW005-Series 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 ex tended
periods can adversely affect device reliability.
Electrical Specifications
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 achiev e maximum safety and system protection, always use an input line fuse. The
safety agencies require a normal-blow fuse with a maximum rating of 5 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 Device Symbol Min Typ Max Unit
Input Voltage:
Continuous
Transi ent (100 m s)
LC
LW
LW
VI
VI
VI, trans
0
0
0
—
—
—
50
80
100
Vdc
Vdc
V
Operating Case Temperature All TC–40 —105 °C
Operating Ambient Temperature in
Natural Convection (See Thermal Con-
siderations section.)
All TA–40 —85 °C
Storage Temperature All Tstg –55 —125 °C
I/O Isolation Voltage (1 minute) All ———1500 Vdc
Parameter Device Symbol Min Typ Max Unit
Operating Input Voltage LC
LW VI
VI18
36 24
48 36
75 Vdc
Vdc
Maximum Input Current
(VI = 0 to VI, max; IO = IO, max; see Figures
1 and 2.)
LC
LW II, max
II, max —
——
—0.6
0.3 A
A
Inrush Transient All I2t——0.2 A2s
Input Reflected-ripple Current
(5 Hz to 20 MHz; 12 µH source
impedance; TC = 25 °C; see Figure 16.)
All II—5—mAp-p
Input Ripple Rejection
(100 Hz—120 Hz) All ——45 —dB
Tyco Electronics Corp. 3
Data Sheet
December 1999 18 Vdc to 36 Vdc or 36 Vdc to 75 Vdc Inputs, 5 W
LC/LW005-Series Power Modules:
Electrical Specifications (continued)
Table 2. Output Specifications
Parameter Device Code
or Suffix Symbol Min Typ Max Unit
Output Voltage Set Poi nt
(VI = VI, nom; IO = IO, m ax; TC = 25 °C) F
A
B
C
VO, set
VO, set
VO, set
VO, set
3.17
4.85
11.52
14.40
—
—
—
—
3.43
5.20
12.48
15.60
Vdc
Vdc
Vdc
Vdc
Output Voltage
(Over all line, load, and temperature
conditions until end of life; see
Figure 18.)
F
A
B
C
VO
VO
VO
VO
3.13
4.80
11.40
14.25
—
—
—
—
3.47
5.25
12.60
15.75
Vdc
Vdc
Vdc
Vdc
Output Regu la tion :
Line (VI = VI, min to VI, max)
Load (IO = IO, m in to IO, m ax; see
Figure 3.)
Temperature
(TC=–40 °C to +85 °C)
A, F
B, C
A, F
B, C
A, F
B, C
—
—
—
—
—
—
—
—
—
—
—
—
2
0.03
2
0.1
25
0.5
5
0.1
10
0.2
100
2.0
mV
%VO
mV
%VO
mV
%VO
Output Ripple and Noise Voltage:
With an External 0.1 µF Ceramic
Output Capacitor (See Figure 17.):
RMS
Peak-to-peak (5 Hz to 20 MHz)
With an External 3.3 µF Ceramic
Output Capaci tor:
RMS
Peak-to-peak (5 Hz to 20 MHz)
All
All
A, F
A, F
—
—
—
—
—
—
—
—
—
—
—
—
35
150
30
100
mVrms
mVp-p
mVrms
mVp-p
External Load Capacitance A, F
B, C —
—0
0—
—470
100 µF
µF
Output Curr ent
(At IO < IO, min, the modules may e xceed
output ripple specifications, but opera-
tion is guaranteed.)
F
A
B
C
IO
IO
IO
IO
0.12
0.1
0.08
0.06
—
—
—
—
1.21
1.0
0.42
0.33
A
A
A
A
Output Cur rent- limi t Ince pti on
(VO = 90% VO, set; see Figure 4.) F
A
B, C
IO
IO
IO
—
—
—
1.7
1.4
0.6
3.0
2
0.9
A
A
A
Output Sh ort-circu it Cur rent
(VO = 0.25 V) F
A
B, C
IO
IO
IO
—
—
—
2.4
2.2
1.0
4.5
4.0
2.5
A
A
A
Efficiency
(VI = VI, nom; IO = IO, max; TC = 25 °C;
see Figures 6 through 8.)
LC005F
LC005A
LC005B, C
LW005F
LW005A, B, C
η
η
η
η
η
69
73
71
71
75
72
76
74
74
78
—
—
—
—
—
%
%
%
%
%
Switching Frequency All ——300 —kHz
4Tyco Electronics Corp.
Data Sheet
December 1999
18 Vdc to 36 Vdc or 36 Vdc to 75 Vdc Inputs, 5 W
LC/LW005-Series Power Modules:
Electrical Specifications (continued)
Table 2. Output Specifications (continued)
Table 3. Isolation Specifications
Table 4. General Specifications
Parameter Device Code
or Suffix Symbol Min Typ Max Unit
Dynamic Response
(∆IO/∆t = 1 A/10 µs; VI = VI, nom;
TC = 25 °C; see Figures 12 and 13.) :
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
—
—
—
—
—
—
—
—
1.5
0.8
1.5
0.8
—
—
—
—
%VO, set
ms
%VO, set
ms
Parameter Min Typ Max Unit
Isolation Capacitance —2300 —pF
Isolation Resistance 10 ——M¾
Parameter Min Typ Max Unit
Calculated MTBF
(IO = 80% of IO, max; T C = 40 °C) —8,400,000 —hours
Weight ——17 (0.6) g (oz.)
Hand Soldering
(soldering iron 3 mm (0.125 in.) tip, 425 °C) ——12 s
Tyco Electronics Corp. 5
Data Sheet
December 1999 18 Vdc to 36 Vdc or 36 Vdc to 75 Vdc Inputs, 5 W
LC/LW005-Series Power Modules:
Electrical Specifications (continued)
Table 5. Feature Specification s
Parameter Device
Code Suffix Symbol Min Typ Max Unit
Remote On/Off Signal Interface (optional)
(VI = 0 V to VI, max; open collector or equiva-
lent compatible; signal referenced to VI(–)
terminal. See Feature Descriptions section
and Figure 19.):
Positive Logic—Device Code Suffix “4:”
Logic Low—Module Off
Logic High—Module On
Module Specifications:
On/Off Current—Logic Low
On/Off Voltage:
Logic Low
Logic High (Ion/off = 0)
Open Collector Switch Specifications:
Leakage Current During Logic High
(Von/off = 15 V)
Output Low Voltage During Logic Low
(Ion/off = 10 mA)
All
All
All
All
All
Ion/off
Von/off
Von/off
Ion/off
Von/off
—
–0.7
—
—
—
5.0
—
—
—
—
10
1.2
15
50
1.2
mA
V
V
µA
V
Turn-on Delay and Rise Times
(at 80% of IO, max; TC = 25 °C; see Figures 14
and 15.):
Case 1: On/Off Input Is Set for Unit On and
then Input Power Is Applied (delay from
point at which VI = VI, min until VO = 10% of
VO, nom).
Case 2: Input Power Is Applied for at Least
One Second, and then the On/Off Input Is
Set to Turn the Module On (delay from point
at which on/off input is toggled until
VO = 10% of VO, nom).
Output Voltage Rise Time
(time for VO to rise from 10% of V O, nom to
90% of VO, nom)
Output Voltage Overshoot
(at 80% of IO, max; TC = 25 °C)
All
All
All
All
Tdelay
Tdelay
Trise
—
—
—
—
—
5
4
0.3
0
20
10
5
5
ms
ms
ms
%
Output Overvoltage Protection (clam p) F
A
B
C
VO, clamp
VO, clamp
VO, clamp
VO, clamp
3.5
5.4
12.7
15.8
—
—
—
—
6.2
7.0
16.0
21.0
V
V
V
V
Undervoltage Lockout LCxxx
LWxxx Vuvlo
Vuvlo 11
20 14
27 —
—V
V
6Tyco Electronics Corp.
Data Sheet
December 1999
18 Vdc to 36 Vdc or 36 Vdc to 75 Vdc Inputs, 5 W
LC/LW005-Series Power Modules:
Characteristic Curves
8-2390(C)
Figure 1. LC005x Input Current vs. Input Voltage at
IO= IO, max and TC = 25 °C
8-2391(C)
Figure 2. LW005x Input Current vs. Input Voltage at
IO = IO, max and TC = 25 °C
8-2392(C)
Figure 3. LW005x Load Regulation, Normalized
Output Voltage vs. Normalized Output
Current at TC = 25 °C
8-2393(C)
Figure 4. Lx005x Normalized Output Current vs.
Normalized Output Voltage at TC = 25 °C
5 10 15 2520 30
0.00
0.30
INPUT V OLTA GE, VI (V)
0.20
0.15
0.25
35
0.40
400
0.35
0.10
0.05
0.45
INPUT CURRENT, II (A)
10 20 30 5040 60
0.00
0.12
INPUT V OLTAGE, V
I
(V)
0.08
0.06
0.10
70
0.16
800
0.14
0.04
0.02
0.18
0.20
INPUT CURRENT, I
I
(A)
0,2 0.6 0.7 0.8 0.9
0.9994
1.0004
OUTPUT CURRENT NORMALIZED TO FULL LOAD
1.0000
0.9998
1.0002
1.0008
1.00.1
1.0006
0.9996
0.4 0.50.3
NORMALIZED OUTPUT VOLTAGE,
(VO/VO, SET)
VI = LOWLINE
VI = NOMLINE
VI = HIGHLINE
0.4
0.5 1.0 1.5 2.0 2.5
0.0
0.6
0.8
0.0
1.0
0.2
NORMALIZED OUTPUT
VOLTAGE,
V
I
= HIGH LINE
V
I
= NOM LINE
V
I
= LOW LINE
OUTPUT CURRENT NORMALIZED TO
I
O, max
(I
O
/I
O, max
)
(V
O
/V
O,set
)
7
Tyco Electronics Corp.
Data Sheet
December 1999 18 Vdc to 36 Vdc or 36 Vdc to 75 Vdc Inputs, 5 W
LC/LW005-Series Power Modules:
Characteristics Curves (continued)
8-2396(C)
Figure 5. LC005F T ypical Efficiency vs. Normalized
Output Current at TC = 25 °C
8-2394(C)
Figure 6. LC005A Typical Efficiency vs. Normalized
Output Current at TC = 25 °C
8-2395(C)
Figure 7. LC005B Typical Efficiency vs. Normalized
Output Current at TC = 25 °C
8-2398(C)
Figure 8. LW005F Typical Efficiency vs.
Normalized Output Current at TC = 25 °C
64
60
68
72
74
62
66
70
EFFICIENCY, η (%)
OUTPUT CURRENT NORMALIZED T O
I
O, max
(I
O
/I
O, max
)
0.2 0.4 0.6 0.80.7 0.9 1.00.1 0.3 0.5
V
I
= 18 V
V
I
= 24 V
V
I
= 36 V
74
66
0.2 0.4 0.6 0.80.7 0.9
60
72
68
70
64
62
76
1.00.1
78
EFFICIENCY, η
(%)
0.3 0.5
V
I
= 18 V
V
I
= 36 V
V
I
= 24 V
OUTPUT CURRENT NORMALIZED TO
I
O, MAX
(I
O
/I
O, MAX
)
EFFICIENCY,
h
(%)
74
64
60
68
72
76
62
66
70
EFFICIENCY, η (%)
OUTPUT CURRENT NORMALIZED T O
IO, max (IO/IO, max)
0.2 0.4 0.6 0.80.7 0.9 1.00.1 0.3 0.5
VI = 18 V
VI = 24 V
VI = 36 V
74
64
60
68
72
76
62
66
70
OUTPUT CURRENT NORMALIZED T O
IO, max (IO/IO, max)
0.2 0.4 0.6 0.80.7 0.9 1.00.1 0.3 0.5
VI = 36 V
VI = 48 V
VI = 60 V
VI = 75 V
EFFICIENCY, η
(%)
8Tyco Electronics Corp.
Data Sheet
December 1999
18 Vdc to 36 Vdc or 36 Vdc to 75 Vdc Inputs, 5 W
LC/LW005-Series Power Modules:
Characteristics Curves (continued)
8-2397(C)
Figure 9. LW005A Typical Efficiency vs.
Normalized Output Current at TC = 25 °C
8-2977(C).a
Figure 10. LW005B Typical Efficiency vs.
Normalized Output Current at TC = 25 °C
8-2978(C).a
Figure 11. LW005C Typical Efficiency vs.
Normalized Output Current at TC = 25 °C
8-2399(C)
Figure 12. Typical Output Volta ge for Step Load
Change from 50% to 75% of IO= IO, max at
TC = 25 °C
76
68
0.2 0.4 0.6 0.80.7 0.9
60
74
70
72
66
62
78
1.00.1
80
EFFICIENCY, η (%)
0.3 0.5
VI = 24 V
64
VI = 48 V
VI = 60 V
VI = 75 V
OUTPUT CURRENT NORMALIZED TO
IO, MAX (IO/IO, MAX)
EFFICIENCY, η (%)
60
OUTPUT CURRENT NORMALIZED T O
I
O, max (
I
O/
I
O, max)
78
76
80
64
62
66
68
70
72
74
0.2 0.4 0.6 0.80.7 0.9 1.00.1 0.3 0.5
V
I
= 48 V
V
I
= 36 V
V
I
= 75 V
EFFICIENCY, η (%)
60
OUTPUT CURRENT NORMALIZED TO
I
O, max (
I
O/
I
O, max)
78
76
80
64
62
66
68
70
72
74
0.2 0.4 0.6 0.80.7 0.9 1.00.1 0.3 0.5
V
I
= 75 V
V
I
= 48 V
V
I
= 36 V
TIME, t (200 µs/div)
NORMALIZED
OUTPUT VOLTAGE,
(VO/VO, SET)
1.00
0.99
0.75
0.50
LOAD CURRENT,
(IO/IO,
MAX)
Tyco Electronics Corp. 9
Data Sheet
December 1999 18 Vdc to 36 Vdc or 36 Vdc to 75 Vdc Inputs, 5 W
LC/LW005-Series Power Modules:
Characteristics Curves (continued)
8-2400(C)
Figure 13. Typical Output Voltage for Step Load
Change from 50% to 25% of IO=IO, max at
TC = 25 °C
8-2401(C)
Figure 14. Typical Output Start-Up when Input
Voltage Is Applied; IO = IO, max,
VI = Nominal Line at TC = 25 °C
8-2402(C)
Figure 15. Typical Output Voltage Start-Up when
Signal Is Applied to Remote On/Off;
IO = IO, max VI = Nominal Line at TC = 25 °C
Test Configurations
8-203(C)
Note: Input reflected-ripple current is measured with a simulated
source impedance of 12 µH. Capacitor Cs offsets possible
battery impedance. Current is measured at the input of the
module.
Figure 16. Input Reflected-Ripple Test Setup
TIME, t (200 µs/div)
NORMALIZED
OUTPUT VOLTAGE,
(V
O
/V
O, SET
)
1.00
0.99
0.25
0.50
1.01
1.02
LOAD CURRENT,
(I
O
/I
O, MAX
)
TIME, t (2 ms/div)
NORMALIZED
OUTPUT V OLTA GE,
(VO/VO, SET)
INPUT V OLTA GE,
(VI/VI, NOM)
1.0
0.0
1.0
0.0
TIME, t (2 ms/div)
NORMALIZED
OUTPUT VOLTAGE,
(VO/VO, SET)
REMOTE ON/OFF,
VON/OFF, (V)
1.0
0.0
15
10
5
0
TO OSCILLOSCOPE
12 µH
C
S
220 µF
IMPEDANCE < 0.1 Ω
@ 20 ˚C, 100 kHz
V
I
(+)
V
I
(-)
BATTERY 33 µF
CURRENT
PROBE
L
TEST
1010 Tyco Electronics Corp.
Data Sheet
December 1999
18 Vdc to 36 Vdc or 36 Vdc to 75 Vdc Inputs, 5 W
LC/LW005-Series Power Modules:
Test Configurations (continued )
8-513(C)
Note: Use one external 0.1 µF ceramic capacitor. Scope meas ure-
ment should be made using a BNC socket . Position the load
between 50 mm and 75 mm (2 in. and 3 in.) from the module.
Figure 17. Peak-to-Peak Output Noise
Measurement Test Setup
8-204(C)
Note: All measurements are taken at the module terminals. When
socket ing, place Kelvin connections at module terminals to
avoid measu rement errors due to socket contact resistance.
Figure 18. 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 (see Figure 16). Highly
inductive sour ce imp eda nc es can af fect the stabilit y of
the power module. If the source inductance exceeds
5 µH, a 33 µF electrolytic capacitor (ESR < 0.7 ¾ at
100 kHz) mounted close to the power module helps
ensure stability of the unit.
Safety Considerations (LC Modules)
For safety-agency approval of the system in which the
power module is used, the power module must be
installed in compliance with the spacing and separation
requir eme nts of the end-u se sa fety agency stan dard,
i.e.,
UL
1950,
CSA
C22.2 No. 950-95, and
VDE
0805
(EN60950, IEC950).
For the converter output to be considered meeting the
requir eme nts of safety ex tra-l ow vo lta ge (S ELV), the
input must meet SELV requirements.
The power module has e xtra-low voltage (ELV) outputs
when all inputs are ELV.
The input to these units is to be provided with a maxi-
mum 5 A normal-blow fuse in the ungrounded lead.
Safety Considerations (LW Modules)
For safety-agency approval of the system in which the
power module is used, the power module must be
installed in compliance with the spacing and separation
requir eme nts of the end-u se sa fety agency stan dard,
i.e.,
UL
1950,
CSA
C22.2 No. 950-95, and
VDE
0805
(EN60950, IEC950).
If the input source is non-SELV (ELV or a hazardous
voltage greater than 60 Vdc and less than or equal to
75 Vdc), f or the module's output to be considered
meeting the requirements of safety extra-low voltage
(SELV), all of the f ollowing must be true:
■The input source is to be provided with reinforced
insulation from any other hazardous voltages, includ-
ing the ac mains.
■One VI pin and one VO pin are to be grounded or
both the input and output pins are to be kept floating.
■The input pins of the module are not operator acces-
sible.
■Another SELV reliability test is conducted on the
whole system, as required by the saf ety agencies, on
the combination of supply source and the subject
module to verify that under a single fault, hazardous
voltages do not appear at the module's output.
Note: Do not ground either of the input pins of the
module without grounding one of the output
pins. This may allow a non-SELV voltage to
appear between the output pins and ground.
The power module has e xtra-low voltage (ELV) outputs
when all inputs are ELV.
The input to these units is to be provided with a maxi-
mum 5 A normal-blow fuse in the ungrounded lead.
VO(+)
VO(–)
RESISTIVE
LOAD
SCOPE
COPPER STRIP
0.1 µF
VI(+)
VI(-)
VO(+)
VO(-)
IIIO
SUPPLY
CONTACT RESISTANCE
CONTACT AND
DISTRIBUTION LOSSES
LOAD
ηVO(+) VO(–)–
[]
IO
VI(+) VI(–)
–
[]
II
------------------------------------------------
100
×
=%
Tyco Electronics Corp. 11
Data Sheet
December 1999 18 Vdc to 36 Vdc or 36 Vdc to 75 Vdc Inputs, 5 W
LC/LW005-Series Power Modules:
Feature Descriptions
Overcurrent Protection
To provide protection in a fault (output overload) condi-
tion, the unit is equipped with internal current-limiting
circuitry and can endure 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 f ault,
the current-limit cir cuit can exhibit either foldback or
tailout characteristics (output-current decrease or
increase). The unit operates normally once the output
current is brought back into its specified range.
Output Overvoltage Protection
The output overvoltage clamp consists of control cir-
cuitry, almost entirely independent of the secondary
regulation circuitry, that monitors the voltage on the
output terminals. This control loop has a higher voltage
set point than the primary loop (see Feature Specifica-
tions table). In a fault condition, the overvoltage clamp
ensures that the output voltage does not exceed
VO, clamp, max. This provides a redundant voltage-
control that reduces the risk of output overvoltage.
If totally redundant overvoltage protection is needed in
the user application, it is recommended that an exter-
nal ov ervoltage protection circuitry be used on the user
application board assembly for additional protection.
F or e x ternal ov ervoltage protection circuit suggestions,
contact technical support.
Input Undervoltage Lockout
At input voltages below the input undervoltage lockout
limit, the module operation is disabled. The module will
begin to operate at an input voltage between the under-
voltage lockout limit and the minimum operating input
voltage.
Remote On/Off (Optional)
Positive logic, device code suffix “4,” remote on/off
turns the module on during a logic-high voltage on the
REMOTE ON/OFF pin, and off during a logic low.
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(–) ter mi nal (Von/off). The
switch may be an open collector or equivalent
(see Figure 19). A logic low is Von/off = –0.7 V to 1.2 V.
The maximum Ion/off during a logic low is 10 mA. The
s witch should maintain a logic-low v oltage while sinking
10 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.
8-758(C).a
Figure 19. Remote On/Off Implementation
Synchronization (Optional)
With external circuitry, the unit is capable of synchroni-
zation at 300 kHz from an independent time base with
a s witching rate of 600 kHz. The synchronization signal
should be applied when the unit is operating to ensure
the unit functions properly.
8-2712(C)
Figure 20. Synchronization Information
+
Ion/off
-
Von/off
REMOTE
ON/OFF
VI(+)
VI(-)
ISYNC SYNC
VI(-)
348 Ω
BAS16
ISYNC =
1.67 µs
9 mA ± 1 mA
0 mA
ISYNC = 25% DUTY CYCLE, 600 kHz
A 600 kHz SYNCHRONIZATION SIGNAL
WILL CAUSE THE POWER MODULE TO
HAVE A SWITCHING FREQUENCY OF
300 kHz.
OR
EQUIVALENT
1212 Tyco Electronics Corp.
Data Sheet
December 1999
18 Vdc to 36 Vdc or 36 Vdc to 75 Vdc Inputs, 5 W
LC/LW005-Series Power Modules:
Thermal Considerations
Sufficient cooling should be provided to help ensure
reliable operation of the power module. Heat-dissipat-
ing components inside the unit are thermally coupled to
the case. Heat is removed by conduction, conv ection,
and radiation to the surrounding environment. Proper
cooling can be verified by measuring the case temper-
ature. The case temperature (TC) should be measured
at the position indicated in Figure 21.
8-1363(C).a
Note: Dimensions are in millimeters and (inches). Pin locations are
for reference only.
Figure 21. Case Temperature Measurement
Location
Note that the view in Figure 21 is of the surface of the
module—the pin locations shown are for reference.
The temperature at this location should not exceed a
maximum case temperature of 105 °C. The output
power of the module should not exceed the rated
power for the module as listed in the Ordering Informa-
tion table.
The LC/LW005-Series Power Modules operate at
IO = IO, max in an 85 °C ambient temperature with
0.25 ms–1 (50 ft./min.) airflow. This airflow is present in
a typical circuit pack environment in a natural cooled
equipment rack, with other components causing airflow
through the chimney effect. In very low airflow en viron-
ments, such as small enclosures, the module should
be derated approximately 10 °C at full load. Note that
these are approximations and that actual case temper-
ature measu re men ts in the equipm ent rack should be
taken to verify the case temperature does not exceed
105 °C.
Heat Transfer Characte ristics
Increasing airflow over the module enhances the heat
transfer via convection. Figure 22 shows the maximum
power that can be dissipated by the module without
ex ceeding the maximum case temperature versus local
ambient temperature (TA) for natural convection
through 3.0 ms–1 (6 00 ft./min.) .
Systems in which these power modules are used typi-
cally generate natural convection airflow rates of
0.25 ms–1 (50 ft./min.) due to other heat dissipating
components in the system. Therefore, the natural con-
vection condition represents airflow rates of approxi-
mately 0.25 ms–1 (50 ft./min.). Use of Figure 22 is
shown in the following example.
Example
What is the minimum airflow necessary for an LW005A
operating at 75 V, an output current of 1 A, and a maxi-
mum ambient temperature of 90 °C?
Solution:
Given: VI = 7 5 V, IO = 1 A (IO, ma x), TA = 90 °C
Determine PD (Figure 27): PD = 1.75 W
Determine airflow (Figure 22): v = 1.0 ms–1
(200 ft./min.)
8-2623(C)
Figure 22. LC/LW005-Series Forced Convection
Power Derating
dc-dc POWER MODULE
16.0 (0.63)
+
-
+
-
OUTIN
10.0
(0.40)
85 90 95 100 105 110
0.0
2.5
1.5
1.0
2.0
80
3.0
0.5
MAX AMBIENT TEMPERATURE,TA (
˚
C)
POWER DISSIPATION, PD (W)
NATURAL CONVECTION
3.0 ms-1(600 ft/min)
2.0 ms-1(400 ft/min)
1.5 ms-1(300 ft/min)
1.0 ms-1(200 ft/min)
MAX CASE
TEMPERATURE
Tyco Electronics Corp. 13
Data Sheet
December 1999 18 Vdc to 36 Vdc or 36 Vdc to 75 Vdc Inputs, 5 W
LC/LW005-Series Power Modules:
Thermal Considerations (continued)
8-2627(C)
Figure 23. LC005F Power Dissipation vs. Output
Current
8-2629(C)
Figure 24. LC005A P ower Dissipation vs. Output
Current
8-2624(C)
Figure 25. LC005B Power Dissipation vs. Output
Current
8-2626(C)
Figure 26. LW005F Power Dissipation vs. Output
Current
NORMALIZED OUTPUT CURRENT, IO/IO, max (%)
1.7
0.7
0.3
1.1
1.5
1.9
0.5
0.9
1.3
30 40 60502010
POWER DISSIPATION, PD (W)
70 80 10090
VI = 24 V
VI = 36 V
VI = 18 V
NORMALIZED OUTPUT CURRENT, I
O
/I
O, max
(%)
1.7
0.9
20 30 40 6050 70
0.3
1.5
1.1
1.3
0.7
0.5
80 9010
1.9
POWER DISSIPAPTION, P
D
(W)
100
V
I
= 24 V
V
I
= 36 V
V
I
= 18 V
1.9
1.1
0.5
1.7
NORMALIZED OUTPUT CURRENT, IO/IO, max (%)
1.3
1.5
0.9
0.7
2.1
20
2.3
POWER DISSIPATION, PD (W)
VI = 36 V
VI = 24 V
VI = 18 V
100806040
NORMALIZED OUTPUT CURRENT, IO/IO, max (%)
1.7
0.7
0.3
1.1
1.5
1.9
0.5
0.9
1.3
20 30 40 50 70 9010
POWER DISSIPATION, PD (W)
VI = 48 V
VI = 75 V
VI = 36 V
60 80 100
1414 Tyco Electronics Corp.
Data Sheet
December 1999
18 Vdc to 36 Vdc or 36 Vdc to 75 Vdc Inputs, 5 W
LC/LW005-Series Power Modules:
Thermal Considerations (continued )
8-2625(C)
Figure 27. LW005A Power Dissipation vs. Output
Current
8-2628(C)
Figure 28. LW005B Power Dissipation vs. Output
Current
8-2812(C)
Figure 29. LW005C Power Dissipation vs. Output
Current
Module Derating
The derating curves in Figure 22 were derived by mea-
surements obtained in an experimental apparatus
shown in Figure 30. Note that the module and the
printed-wiring board (PWB) that it is mounted on are
both vertically oriented. The passage has a rectangular
cross section.
8-1126(C).a
Note: Dimensions are in millimeters and (inches).
Figure 30. Experimental Test Setup
NORMALIZED OUTPUT CURRENT, IO/IO, max (%)
20 30 40 50 60 70
0.0
1.2
0.8
0.6
1.0
1.6
10010
1.4
0.4
80 90
0.2
1.8
2.0
VI = 48 V
VI = 75 V
POWER DISSIPATION, PD (W)
VI = 36 V
NORMALIZED OUTPUT CURRENT, I
O
/I
O, max
(%)
0.4
1.6
1.2
1.0
1.4
1.8
0.8
0.6
2.0
2.2
POWER DISSIPATION, P
D
(W)
30 40 60502010 70 80 10090
V
I
= 48 V
V
I
= 75 V
V
I
= 36 V
1.9
0.9
0.5
1.3
1.7
2.1
0.7
1.1
1.5
20 30 40 50 60 10010
NORMALIZED OUTPUT CURRENT , I
O
/I
O, max
(%)
POWER DISSIPATION, P
D
(W)
9070 80
V
I
= 75 V
V
I
= 48 V
V
I
= 36 V
AIR VELOCITY
AND AMBIENT
TEMPERATURE
MEASURED
BELOW THE
MODULE AIRFLOW
12.7 (0.50)
FACING PWB
MODULE
76 (3.00)
PWB
Tyco Electronics Corp. 15
Data Sheet
December 1999 18 Vdc to 36 Vdc or 36 Vdc to 75 Vdc Inputs, 5 W
LC/LW005-Series Power Modules:
Outline Diagram
Dimensions are in millimeters and (inches).
Tolerance: x.x ± 0.5 mm (0.020 in.); x.xx ± 0.38 mm (0.015 in.).
If slightly lower height is needed, the four standoffs can be dropped through holes on the user’s PWB. By dropping
the standoffs through the PWB, the module height will be decreased to 9.8 mm (0.385 in.) typical height.
8-1329(C).f
* An optional short pin dimension is 2.8 mm ± 0.25 mm (0.110 in. ± 0. 010 in.).
Top View
Side View
Bottom View
Pin Function
1V
I(–)
2V
I(+)
3 ON/OFF or SYNC (optional)
Pin is not present unless one of these
options is specified.
4V
O(+)
5V
O(–)
0.38
(0.015)
10.16 (0.400)
5.84 (0.230)*
MIN
DIAMETER 0.63(0.025)
TYP, 4 PLACES
STANDOFF 0.63 (0.025) x 0.63 (0.025)
SQUARE PIN
5.8
(0.23)
20.32
(0.800)
12.7
(0.500)
0.64 (0.025)
TYP
5.3 (0.21)
10.2
(0.40) 25.6 (1.01)
9.5
(0.38)
7.62
(0.300)
24.1
(0.95)
5.08
(0.200)
2
1
3
4
5
+
-
+
-
OUT
INLW005A84
DC-DC Power Module
MADE IN USA
32.0 (1.26)
25.4
(1.00)
OUT
IN:DC 36-75V, 0.18A OUT:DC 5V,1A
ON/OFF
16 Tyco Electronics Corp.
Data Sheet
December 1999
18 Vdc to 36 Vdc or 36 Vdc to 75 Vdc Inputs, 5 W
LC/LW005-Series Power Modules:
Recommended Hole Patter n
Component-side footprint.
Dimensions are in millimeters and (inches).
8-1329(C).f
Ordering Information
Table 6. Device Codes
* Please contact your Ty co Elect ronics’ Account Manager or Field Application Engineer for pricing and availability.
Optional features may be ordered using the device code suffixes shown below. The feature suffixes are listed
numerically in descending order . Please contact your Tyco Electronics’ Account Manager or Field Application Engi-
neer for pricing and availability.
Table 7. Device Options
* Customized option. May not be available on all codes.
Input Voltage Output Voltage Output Power Device Code Comcode
24 V 3.3 V 4 W LC005F 108122201
24 V 5 V 5 W LC005A 108122185
24 V 12 V 5 W LC005B 108122193
24 V 15 V 5 W LC005C TBD*
48 V 3.3 V 4 W LW005F 108122177
48 V 5 V 5 W LW005A 108122136
48 V 12 V 5 W LW005B 108122169
48 V 15 V 5 W LW005C 108407024
Option Device Code Suffix
Short pins: 2.8 mm ± 0.25 mm (0.110 in. ± 0.010 in.) 8
Positive logic remote on/off
(cannot be ordered on units with the synchronization option) 4
Synchronization*
(cannot be ordered on units with the remote on/off option) 3
CASE OUTLINE
STANDOFF
5.8
(0.23) 20.32
(0.800)
5.3 (0.21)
10.2
(0.40)
32.0 (1.26)
9.5
(0.38)
7.62
(0.300)5.08
(0.200)
25.4
(1.00)
24.1
(0.95)
20.32
(0.800)
25.6 (1.01)
Tyco Electronics Corp. 17
Data Sheet
December 1999 18 Vdc to 36 Vdc or 36 Vdc to 75 Vdc Inputs, 5 W
LC/LW005-Series Power Modules:
Notes
1818 Tyco Electronics Corp.
Data Sheet
December 1999
18 Vdc to 36 Vdc or 36 Vdc to 75 Vdc Inputs, 5 W
LC/LW005-Series Power Modules:
Notes
Tyco Electronics Corp. 19
Data Sheet
December 1999 18 Vdc to 36 Vdc or 36 Vdc to 75 Vdc Inputs, 5 W
LC/LW005-Series Power Modules:
Data Sheet
December 1999
18 Vdc to 36 Vdc or 36 Vdc to 75 Vdc Inputs, 5 W
LC/LW005-Series Power Modules:
Printed on
Recycled Paper
Ty co Electronics Power System s, Inc.
3000 Skyline Drive, Mesquite, TX 75149, USA
+1-800-526-7819 FAX: +1-888-315-5182
(Outs ide U.S.A.: +1-972-284-2626, FAX: +1-972-284-2900)
http://power.tycoelectronics.com
Tyco Electronics Corporation reserves the right to make changes to the product(s) or information contained herein without notice. No liability is assumed as a result of their use or application.
No rights under any patent accompany the sale of any such product(s) or information.
© 2001 Tyco Electronics Corporation, Harrisburg, PA. All International Rights Reserved.
Printed in U.S.A.
December 1999
DS99-038EPS (Replaces DS98-037EP S)
