Data Sheet
January 2000
LW020 Single-Output-Series Power Modules:
36 Vdc to 75 Vdc Inputs; 20 W
Features
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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
Wide input voltage range: 36 Vdc to 75 Vdc
Overcurrent protection
Output overvoltage protection
Input-to-output isolation: 1500 Vdc
Operating case temperature range: –40
°C
to
+110
°C
Remote on/off
Output voltage adjustment: 90% to 110% of V
O, nom
JQA Certified to EN60950
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The LW020 Single-Output-Series Power Modules use
advanced, surface-mount technology and deliver high-quality,
compact, dc-dc conversion at an economical price.
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Applications
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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
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Distributed power architectures
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Communication equipment
Computer equipment
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.)
Options
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Choice of remote on/off configuration
Case ground pin
Synchronization
Short pins: 2.79 mm
±
0.25 mm
(0.110 in.
±
0.010 in.)
Short pins: 3.68 mm
±
0.25 mm
(0.145 in.
±
0.010 in.)
s
LW020 Single-Output-Series Power Modules:
36 Vdc to 75 Vdc Inputs; 20 W
Data Sheet
January 2000
Absolute Maximum Ratings
Stresses in excess of the absolute maximum ratings can cause permanent damage to the devices. These are
absolute stress ratings only. Functional operation of the devices 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.
Parameter
Input Voltage:
Continuous
Transient (100 ms)
Operating Case Temperature
(See Thermal Considerations section.)
Storage Temperature
I/O Isolation Voltage
Symbol
V
I
V
I, trans
T
C
T
stg
—
Min
0
0
–40
–40
—
Max
80
100
110*
120
1500
Unit
Vdc
V
°C
°C
Vdc
* Maximum case temperature varies based on power dissipation. See derating curve, Figure 16, for details.
Electrical Specifications
Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature
conditions.
Table 1. Input Specifications
Parameter
Operating Input Voltage
Maximum Input Current
(V
I
= 0 V to V
I, max
; I
O
= I
O, max
; see Figure 1.)
Inrush Transient
Input Reflected-ripple Current
(50 Hz to 20 MHz; 12
µH
source impedance,
T
C
= 25
°C;
see Figure 11 and Design
Considerations section.)
Input Ripple Rejection (100 Hz—120 Hz)
Symbol
V
I
I
I, max
i
2
t
I
I
Min
36
—
—
—
Typ
48
—
—
3
Max
75
1.1
0.1
—
Unit
Vdc
A
A
2
s
mAp-p
—
—
60
—
dB
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 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.
2
Lucent Technologies Inc.
Data Sheet
January 2000
LW020 Single-Output-Series Power Modules:
36 Vdc to 75 Vdc Inputs; 20 W
Electrical Specifications
(continued)
Table 2. Output Specifications
Parameter
Output Voltage Set Point
(V
I
= 48 V; I
O
= I
O, max
; T
C
= 25
°C)
Device
LW020G
LW020F
LW020A
LW020B
LW020C
LW020G
LW020F
LW020A
LW020B
LW020C
All
All
All
Symbol
V
O, set
V
O, set
V
O, set
V
O, set
V
O, set
V
O
V
O
V
O
V
O
V
O
—
—
—
Min
2.46
3.25
4.92
11.81
14.76
2.4
3.20
4.85
11.64
14.55
—
—
—
Typ
2.5
3.3
5.0
12.0
15.0
—
—
—
—
—
0.01
0.05
0.5
Max
2.54
3.35
5.08
12.19
15.24
2.6
3.40
5.15
12.36
15.45
0.1
0.2
1.0
Unit
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
%V
O
%V
O
%V
O
Output Voltage
(Over all line, load, and temperature
conditions until end of life; see Figure 13.)
Output Regulation:
Line (V
I
= 36 V to 75 V)
Load (I
O
= I
O, min
to I
O, max
)
Temperature (T
C
= –40
°C
to +100
°C)
Output Ripple and Noise Voltage
(See Figure 12.):
RMS
Peak-to-peak (5 Hz to 20 MHz)
Output Current
(At I
O
< I
O, min
, the modules may exceed
output ripple specifications.)
Output Current-limit Inception
(V
O
= 90% x V
O, set
; see Figure 2.)
Output Short-circuit Current
(V
O
= 250 mV)
Efficiency
(V
I, nom
; I
O
= I
O, max
; T
C
= 25
°C;
see Figures
3—7 and 13.)
LW020A, F, G
LW020B, C
LW020A, F, G
LW020B, C
LW020A, F, G
LW020B
LW020C
All
LW020C
LW020B
LW020A, F, G
LW020G
LW020F
LW020A
LW020B
LW020C
All
—
—
—
—
I
O
I
O
I
O
I
O
I
O
I
O
I
O
η
η
η
η
η
—
—
—
—
—
0.4
0.17
0.13
103
—
—
—
71
74
77
82
82
—
—
—
20
50
—
—
—
—
150
150
150
75
77
81
85
85
256
20
50
100
150
4.0
1.67
1.33
150
250
220
200
—
—
—
—
—
—
mVrms
mVrms
mVp-p
mVp-p
A
A
A
%I
O, max
%I
O, max
%I
O, max
%I
O, max
%
%
%
%
%
kHz
Switching Frequency
Dynamic Response
(∆I
O
/∆t = 1 A/10
µs,
V
I
= V
I, nom
, T
A
= 25
°C):
Load Change from I
O
= 50% to 75% of
I
O, max
:
Peak Deviation
Settling Time (V
O
< 10% peak
deviation)
Load Change from I
O
= 50% to 25% of
I
O, max
:
Peak Deviation
Settling Time (V
O
< 10% peak
deviation)
All
All
—
—
—
—
2
1.0
—
—
%V
O, set
ms
All
All
—
—
—
—
2
1.0
—
—
%V
O, set
ms
Lucent Technologies Inc.
3
LW020 Single-Output-Series Power Modules:
36 Vdc to 75 Vdc Inputs; 20 W
Data Sheet
January 2000
Electrical Specifications
(continued)
Table 3. Isolation Specifications
Parameter
Isolation Capacitance
Isolation Resistance
Min
—
10
Typ
0.002
—
Max
—
—
Unit
µF
MΩ
General Specifications
Parameter
Calculated MTBF (I
O
= 80% of I
O, max
; T
C
= 40
°C)
Weight
—
Min
Typ
4,500,000
—
54 (1.9)
Max
Unit
hours
g (oz.)
Feature Specifications
Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature
conditions. See Feature Descriptions and Design Considerations for further information.
Parameter
Remote On/Off Signal Interface:
(V
I
= 0 V to V
I, max
; open collector or equivalent
compatible; signal referenced to V
I
(–) terminal.
See Figure 14 and Feature Descriptions.):
Negative Logic: Device Code Suffix “1”:
Logic Low—Module On
Logic High—Module Off
Positive Logic: If Device Code Suffix “1” is not
specified:
Logic Low—Module Off
Logic High—Module On
Module Specifications:
On/Off Current—Logic Low
On/Off Voltage:
Logic Low
Logic High (I
on/off
= 0)
Open Collector Switch Specifications:
Leakage Current During Logic High
(V
on/off
= 10 V)
Output Low Voltage During Logic Low
(I
on/off
= 1 mA)
Device
Symbol
Min
Typ
Max
Unit
All
All
All
All
All
I
on/off
V
on/off
V
on/off
I
on/off
V
on/off
—
–0.7
—
—
—
—
—
—
—
—
1.0
1.2
10
50
1.2
mA
V
V
µA
V
4
Lucent Technologies Inc.
Data Sheet
January 2000
LW020 Single-Output-Series Power Modules:
36 Vdc to 75 Vdc Inputs; 20 W
Feature Specifications
(continued)
Parameter
Turn-on Delay and Rise Times
(at 80% of I
O, max
; T
A
= 25
°C):
Case 1: On/Off Input Is Set for Unit On and then
Input Power Is Applied (delay from point at
which V
I
= 48 V until V
O
= 10% of V
O, 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 V
O
= 10% of
V
O, nom
).
Output Voltage Rise Time (time for V
O
to rise
from 10% of V
O, nom
to 90% of V
O, nom
)
Output Voltage Overshoot (at 80% of I
O, max
;
T
A
= 25
°C)
Output Voltage Set-point Adjustment Range
Output Overvoltage Protection (clamp)
Device
Symbol
Min
Typ
Max
Unit
All
T
delay
—
27
50
ms
All
T
delay
—
2
10
ms
All
All
LW020B
All others
LW020G
LW020F
LW020A
LW020B
LW020C
T
rise
—
—
—
V
O, clamp
V
O, clamp
V
O, clamp
V
O, clamp
V
O, clamp
—
—
83
90
2.9
3.9
5.6
13.2
16.5
1.5
—
—
—
—
—
—
—
—
3.0
5
110
110
3.8
5.0
7.0
16.5
20.0
ms
%
%V
O, nom
%V
O, nom
V
V
V
V
V
Lucent Technologies Inc.
5
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