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PDF LW020 Data sheet ( Hoja de datos )
| Número de pieza | LW020 | |
| Descripción | Single-Output-Series Power Modules | |
| Fabricantes | Lineage Power | |
| Logotipo |  |
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Data Sheet
April 2008
LW020 Single-Output-Series Power Modules:
36 Vdc to 75 Vdc Inputs; 20 W
The LW020 Single-Output-Series Power Modules use
advanced, surface-mount technology and deliver high-qual-
ity, compact, dc-dc conversion at an economical price.
Applications
n Distributed power architectures
n Communication equipment
n Computer equipment
Options
n Choice of remote on/off configuration
n Case ground pin
n Synchronization
n Short pins: 2.79 mm ± 0.25 mm
(0.110 in. ± 0.010 in.)
n Short pins: 3.68 mm ± 0.25 mm
(0.145 in. ± 0.010 in.)
Features
n Low profile: 9.91 mm (0.390 in.) with 0.38 mm
(0.015 in.) standoffs, 9.53 mm (0.375 in.) with
standoffs recessed
n Wide input voltage range: 36 Vdc to 75 Vdc
n Overcurrent protection
n Output overvoltage protection
n Input-to-output isolation: 1500 Vdc
n Operating case temperature range: –40 °C to
+110 °C
n Remote on/off
n Output voltage adjustment: 90% to 110% of VO, nom
n JQA Certified to EN60950
n UL* 1950 Recognized, CSA† C22.2 No. 950-95
Certified, VDE‡ 0805 (EN60950, IEC950) Licensed
n CE mark meets 73/23/EEC and 93/68/EEC
directives§
n Within FCC Class A radiated limits
Description
The LW020 Single-Output-Series Power Modules are
low-profile dc-dc converters that operate over an
input voltage range of 36 Vdc to 75 Vdc and provide
precisely regulated outputs. The outputs are isolated
from the input, allowing versatile polarity configura-
tions and grounding connections. Built-in filtering for
both input and output minimizes the need for external
filtering. The modules have a maximum power rating
of 20 W at a typical full-load efficiency of up to 85%.
* 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.)
Free Datasheet http://www.datasheet4u.com/
1 page  
Data Sheet
April 2008
LW020 Single-Output-Series Power Modules:
36 Vdc to 75 Vdc Inputs; 20 W
Feature Specifications (continued)
Parameter
Device Symbol Min Typ Max Unit
Turn-on Delay and Rise Times
(at 80% of IO, max; TA = 25 °C):
Case 1: On/Off Input Is Set for Unit On and then
Input Power Is Applied (delay from point at
which VI = 48 V until VO = 10% of VO, nom).
Case 2: 48 V Input 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 VO, nom to 90% of VO, nom)
Output Voltage Overshoot (at 80% of IO, max;
TA = 25 °C)
All
All
All
All
Tdelay
Tdelay
—
—
Trise
—
—
—
27 50
2 10
1.5 3.0
—5
ms
ms
ms
%
Output Voltage Set-point Adjustment Range
LW020B
All others
—
—
83 — 110 %VO, nom
90 — 110 %VO, nom
Output Overvoltage Protection (clamp)
LW020G VO, clamp
2.9
—
3.8
LW020F VO, clamp
3.9
—
5.0
LW020A VO, clamp
5.6
—
7.0
LW020B VO, clamp 13.2 — 16.5
LW020C VO, clamp 16.5 — 20.0
V
V
V
V
V
Lineage Power
5
Free Datasheet http://www.datasheet4u.com/
5 Page 
Data Sheet
April 2008
LW020 Single-Output-Series Power Modules:
36 Vdc to 75 Vdc Inputs; 20 W
Feature Descriptions (continued)
Synchronization (Optional)
The unit is capable of external synchronization from an
independent time base with a switching rate of
256 kHz. The amplitude of the synchronizing pulse
train is TTL compatible and the duty cycle ranges
between 40% and 60%. Synchronization is referenced
to VI(+).
Thermal Considerations
Introduction
The LW020 Single-Output-Series power module oper-
ates in a variety of thermal environments; however, suf-
ficient cooling should be provided to help ensure
reliable operation of the unit. Heat-dissipating compo-
nents inside the unit are thermally coupled to the case.
Heat is removed by conduction, convection, and radia-
tion to the surrounding environment. Proper cooling
can be verified by measuring the case temperature.
Peak case temperature (TC) occurs at the position indi-
cated in Figure 15.
power of the module should not exceed the rated
power for the module as listed in the Ordering Informa-
tion table.
Heat Transfer
Increasing airflow over the module enhances the heat
transfer via convection. Figure 16 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 3.0 ms–1 (600 ft./min.).
Systems in which these power modules may be used
typically generate natural convection airflow rates of
0.3 ms–1 (60 ft./min.) due to other heat-dissipating com-
ponents in the system. Therefore, the natural convec-
tion condition represents airflow rates of up to 0.3 ms–1
(60 ft./min.). Use of Figure 16 is shown in the following
example.
Example
What is the minimum airflow necessary for a LW020A
operating at VI = 48 V, an output current of 3.6 A, and a
maximum ambient temperature of 85 °C?
Solution:
Given: VI = 48 V, IO = 3.6 A, TA = 85 °C
Determine PD (Figure 18): PD = 4.5 W
Determine airflow (Figure 16): v = 1.0 ms–1
(200 ft./min.)
8-1265(C)
Note: Dimensions are in millimeters and (inches). Pin locations are
for reference only.
Figure 15. Case Temperature Measurement
Location
Note that the view in Figure 15 is of the metal surface
of the module—the pin locations shown are for refer-
ence. The temperature at this location should not
exceed the maximum case temperature indicated in
the derating curve shown in Figure 16. The output
7
MAX CASE
TEMPERATURE
6
5
4
NATURAL
3
CONVECTION
1.0 ms-1 (200 ft./min.)
2.0 ms-1 (400 ft./min.)
2 3.0 ms-1 (600 ft./min.)
1
0
40 50 60 70 80 90 100 110 120
MAX AMBIENT TEMPERATURE, TA (˚C)
8-1264(C).a
Note: Conversion factor for linear feet per minute to meters per
second: 200 ft./min. = 1 ms–1.
Figure 16. Forced Convection Power Derating;
Either Orientation
Lineage Power
11
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11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LW020.PDF ] | |
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