VISHAY LW020B

Data Sheet
April 2008
LW020 Single-Output-Series Power Modules:
36 Vdc to 75 Vdc Inputs; 20 W
Features
n
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
The LW020 Single-Output-Series Power Modules use
advanced, surface-mount technology and deliver high-quality, compact, dc-dc conversion at an economical price.
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
n
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.)
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
Applications
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
n
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
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 configurations 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 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.)
LW020 Single-Output-Series Power Modules:
36 Vdc to 75 Vdc Inputs; 20 W
Data Sheet
April 2008
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
Symbol
Min
Max
Unit
VI
VI, trans
0
0
80
100
Vdc
V
Operating Case Temperature
(See Thermal Considerations section.)
TC
–40
110*
°C
Storage Temperature
Tstg
–40
120
°C
I/O Isolation Voltage
—
—
1500
Vdc
Input Voltage:
Continuous
Transient (100 ms)
* 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
Symbol
Min
Typ
Max
Unit
VI
36
48
75
Vdc
II, max
—
—
1.1
A
Inrush Transient
i 2t
—
—
0.1
A2s
Input Reflected-ripple Current
(50 Hz to 20 MHz; 12 µH source impedance,
TC = 25 °C; see Figure 11 and Design Considerations
section.)
II
—
3
—
mAp-p
Input Ripple Rejection (100 Hz—120 Hz)
—
—
60
—
dB
Operating Input Voltage
Maximum Input Current
(VI = 0 V to VI, max; IO = IO, max; see Figure 1.)
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 fusing 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
Lineage Power
LW020 Single-Output-Series Power Modules:
36 Vdc to 75 Vdc Inputs; 20 W
Data Sheet
April 2008
Electrical Specifications (continued)
Table 2. Output Specifications
Parameter
Device
Symbol
Min
Typ
Max
Unit
Output Voltage Set Point
(VI = 48 V; IO = IO, max; TC = 25 °C)
LW020G
LW020F
LW020A
LW020B
LW020C
VO, set
VO, set
VO, set
VO, set
VO, set
2.46
3.25
4.92
11.81
14.76
2.5
3.3
5.0
12.0
15.0
2.54
3.35
5.08
12.19
15.24
Vdc
Vdc
Vdc
Vdc
Vdc
Output Voltage
(Over all line, load, and temperature
conditions until end of life; see Figure 13.)
LW020G
LW020F
LW020A
LW020B
LW020C
VO
VO
VO
VO
VO
2.4
3.20
4.85
11.64
14.55
—
—
—
—
—
2.6
3.40
5.15
12.36
15.45
Vdc
Vdc
Vdc
Vdc
Vdc
All
All
All
—
—
—
—
—
—
0.01
0.05
0.5
0.1
0.2
1.0
%VO
%VO
%VO
LW020A, F,
G
LW020B, C
LW020A, F,
G
LW020B, C
—
—
—
—
—
—
—
—
—
—
20
50
20
50
100
150
mVrms
mVrms
mVp-p
mVp-p
LW020A, F,
G
LW020B
LW020C
IO
IO
IO
0.4
0.17
0.13
—
—
—
4.0
1.67
1.33
A
A
A
All
IO
103
—
150
%IO, max
LW020C
LW020B
LW020A, F,
G
IO
IO
IO
—
—
—
150
150
150
250
220
200
%IO, max
%IO, max
%IO, max
LW020G
LW020F
LW020A
LW020B
LW020C
η
η
η
η
η
71
74
77
82
82
75
77
81
85
85
—
—
—
—
—
%
%
%
%
%
All
—
—
256
—
kHz
All
All
—
—
—
—
2
1.0
—
—
%VO, set
ms
All
All
—
—
—
—
2
1.0
—
—
%VO, set
ms
Output Regulation:
Line (VI = 36 V to 75 V)
Load (IO = IO, min to IO, max)
Temperature (TC = –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 IO < IO, min, the modules may exceed
output ripple specifications.)
Output Current-limit Inception
(VO = 90% x VO, set; see Figure 2.)
Output Short-circuit Current
(VO = 250 mV)
Efficiency
(VI, nom; IO = IO, max; TC = 25 °C; see Figures
3—7 and 13.)
Switching Frequency
Dynamic Response
(ýIO/ýt = 1 A/10 µs, VI = VI, nom, TA = 25 °C):
Load Change from IO = 50% to 75% of
IO, max:
Peak Deviation
Settling Time (VO < 10% peak
deviation)
Load Change from IO = 50% to 25% of
IO, max:
Peak Deviation
Settling Time (VO < 10% peak
deviation)
Lineage Power
3
LW020 Single-Output-Series Power Modules:
36 Vdc to 75 Vdc Inputs; 20 W
Data Sheet
April 2008
Electrical Specifications (continued)
Table 3. Isolation Specifications
Parameter
Min
Typ
Max
Unit
Isolation Capacitance
—
0.002
—
µF
Isolation Resistance
10
—
—
M¾
Min
Typ
Max
Unit
54 (1.9)
g (oz.)
General Specifications
Parameter
Calculated MTBF (IO = 80% of IO, max; TC = 40 °C)
4,500,000
Weight
—
hours
—
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:
(VI = 0 V to VI, max; open collector or equivalent
compatible; signal referenced to VI(–) 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 (Ion/off = 0)
Open Collector Switch Specifications:
Leakage Current During Logic High
(Von/off = 10 V)
Output Low Voltage During Logic Low
(Ion/off = 1 mA)
4
Device
Symbol
Min
Typ
Max
Unit
All
Ion/off
—
—
1.0
mA
All
All
Von/off
Von/off
–0.7
—
—
—
1.2
10
V
V
All
Ion/off
—
—
50
µA
All
Von/off
—
—
1.2
V
Lineage Power
Data Sheet
April 2008
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 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)
Output Voltage Set-point Adjustment Range
Output Overvoltage Protection (clamp)
Lineage Power
Device
Symbol
Min
Typ
Max
Unit
All
Tdelay
—
27
50
ms
All
Tdelay
—
2
10
ms
All
Trise
—
1.5
3.0
ms
All
—
—
—
5
%
LW020B
All others
LW020G
LW020F
LW020A
LW020B
LW020C
—
—
83
90
2.9
3.9
5.6
13.2
16.5
—
—
—
—
—
—
—
110
110
3.8
5.0
7.0
16.5
20.0
%VO, nom
%VO, nom
V
V
V
V
V
VO, clamp
VO, clamp
VO, clamp
VO, clamp
VO, clamp
5
LW020 Single-Output-Series Power Modules:
36 Vdc to 75 Vdc Inputs; 20 W
Data Sheet
April 2008
Characteristics Curves
76
74
EFFICIENCY, η (%)
1.0
INPUT CURRENT, II (A)
0.9
0.8
PO = 20 W
0.7
PO = 10 W
PO = 2 W
0.6
0.5
72
70
68
66
VI = 36 V
VI = 48 V
VI = 75 V
64
0.4
62
0.3
60
0.4
0.2
0.9
1.4
1.9
2.4
2.9
3.4
3.9
0.1
OUTPUT CURRENT, IO (A)
0.0
0
10
20
30
40
50
60
70
8-1483(C).a
80
INPUT VOLTAGE, V I (V)
8-1481(C).a
Figure 3. LW020G Typical Converter Efficiency vs.
Output Current, TA = 25 °C
Figure 1. LW020 Typical Input Characteristics,
TA = 25 °C
80
100%
VO, nom
78
EFFICIENCY, η (%)
NORMALIZED OUTPUT VOLTAGE, VO (V)
79
80%
VO, nom
60%
VO, nom
VI = 75
VI = 54
VI = 36
40%
VO, nom
77
76
75
74
VI = 75
73
VI = 54
72
VI = 36
71
20%
VO, nom
70
0.0
0
0
50%
IO, max
100%
IO, max
150%
IO, max
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
OUTPUT CURRENT, IO (A)
8-1483(C)
NORMALIZED OUTPUT CURRENT, IO (A)
8-1258(C).a
Figure 2. LW020A, B, C, F, and G Typical Output
Characteristics, TA = 25 °C
6
Figure 4. LW020F Typical Converter Efficiency vs.
Output Current, TA = 25 °C
Lineage Power
LW020 Single-Output-Series Power Modules:
36 Vdc to 75 Vdc Inputs; 20 W
Data Sheet
April 2008
Characteristics Curves (continued)
88
86
82
81
EFFICIENCY, η (%)
84
EFFICIENCY, η (%)
80
79
78
77
VI = 36
VI = 54
VI = 75
76
75
82
80
78
VI = 75
76
VI = 54
74
VI = 36
72
70
0.0
74
0.2
0.4
0.6
0.8
1.0
1.2
73
OUTPUT CURRENT, IO (A)
72
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
8-1485(C)
4.0
OUTPUT CURRENT, IO (A)
8-1260(C).a
Figure 7. LW020C Typical Converter Efficiency vs.
Output Current, TA = 25 °C
NORMALIZED
OUTPUT VOLTAGE, V O (V)
Figure 5. LW020A Typical Converter Efficiency vs.
Output Current
86
82
80
100%
VO, nom
99%
VO, nom
78
VI = 75
76
VI = 54
74
VI = 36
72
70
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
OUTPUT CURRENT, IO (A)
NORMALIZED
OUTPUT CURRENT, IO (A)
EFFICIENCY, η (%)
84
75%
IO, max
50%
IO, max
8-1484(C)
Figure 6. LW020B Typical Converter Efficiency vs.
Output Current, TA = 25 °C
TIME, t (100 µs/div)
8-1262(C).a
Figure 8. LW020A, B, C, F, and G Typical Output
Voltage for a Step Load Change from 50%
to 75%
Lineage Power
7
LW020 Single-Output-Series Power Modules:
36 Vdc to 75 Vdc Inputs; 20 W
Test Configurations
TO OSCILLOSCOPE
LTEST
101%
VO, nom
CURRENT
PROBE
VI(+)
12 µH
100%
VO, nom
CS 220 µF
IMPEDANCE < 0.1 Ω
@ 20 ˚C, 100 kHz
BATTERY
33 µF
VI(-)
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.
50%
IO, max
25%
IO, max
(A)
NORMALIZED
OUTPUT CURRENT, IO
NORMALIZED
OUTPUT VOLTAGE, VO (V)
Characteristics Curves (continued)
Data Sheet
April 2008
Figure 11. Input Reflected-Ripple Test Setup
TIME, t (100 µs/div)
8-1261(C).b
Figure 9. LW020A, B, C, F, and G Typical Output
Voltage for a Step Load Change from 50%
to 25%
COPPER STRIP
V O (+)
0.1 µF
RESISTIVE
LOAD
SCOPE
NORMALIZED
OUTPUT VOLTAGE, VO
(1 V/div)
REMOTE ON/OFF,
Von/off (V) (2 V/div)
V O (-)
8-513(C)
Note: Use a 0.1 µF ceramic capacitor. Scope measurement should
be made using a BNC socket. Position the load between
50 mm and 75 mm (2 in. and 3 in.) from the module.
5V
Figure 12. Peak-to-Peak Output Noise
Measurement Test Setup
0
100%
VO, nom
50%
VO, nom
CONTACT AND
DISTRIBUTION LOSSES
V I (+)
V O (+)
IO
II
0
LOAD
SUPPLY
TIME, t (1 ms/div)
V I (-)
8-1263(C).b
V O (-)
CONTACT RESISTANCE
8-204(C)
Figure 10. LW020A, B, C, F, and G Typical Output
Voltage Start-Up when Signal Applied to
Remote On/Off
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.
[ V O (+) – V O (–) ]I O
η = ⎛ ------------------------------------------------⎞ × 100
⎝ [ V I (+) – V I (–) ]I I ⎠
%
Figure 13. Output Voltage and Efficiency
Measurement Test Setup
8
Lineage Power
Data Sheet
April 2008
LW020 Single-Output-Series Power Modules:
36 Vdc to 75 Vdc Inputs; 20 W
Design Considerations
The power module has extra-low voltage (ELV) outputs
when all inputs are ELV.
Grounding Considerations
The input to these units is to be provided with a maximum 5 A normal-blow fuse in the ungrounded lead.
For standard units, the case is connected internally to
VI(+). For units with the case ground pin option, the
case is not connected internally allowing the user flexibility in grounding.
Feature Descriptions
Overcurrent Protection
Input Source Impedance
The power module should be connected to a low acimpedance input source. Highly inductive source
impedances can affect the stability of the power module. For the test configuration in Figure 11, a 33 µF
electrolytic capacitor (ESR < 0.7 ¾ at 100 kHz)
mounted close to the power module helps ensure stability of the unit. For other highly inductive source
impedances, consult the factory for further application
guidelines.
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., 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), for the module's output to be considered
meeting the requirements of safety extra-low voltage
(SELV), all of the following must be true:
n
n
n
n
The input source is to be provided with reinforced
insulation from any other hazardous voltages, including 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 accessible.
Another 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 pins and ground.
Lineage Power
To provide protection in a fault (output overload) condition, the unit is equipped with internal current-limiting
circuitry and can endure current limiting for an unlimited 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 fault,
the current-limit circuit 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 circuitry, independent of the primary regulation loop, that
monitors the voltage on the output terminals. The control loop of the protection circuit has a higher voltage
set point than the primary loop (see Feature Specifications 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.
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 REMOTE ON/OFF pin, and off during a
logic low. Negative logic remote on/off, device code
suffix “1,” turns the module off during a logic high and
on 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(–) terminal (Von/off). The
switch can be an open collector or equivalent (see Figure 14). A logic low is Von/off = –0.7 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 6 V. The maximum allowable leakage current of the switch at Von/off = 6 V is 50 µA.
9
LW020 Single-Output-Series Power Modules:
36 Vdc to 75 Vdc Inputs; 20 W
Data Sheet
April 2008
Feature Descriptions (continued)
Remote On/Off (continued)
The module has internal capacitance to reduce noise at the ON/OFF pin. Additional capacitance is not generally
needed and may degrade the start-up characteristics of the module.
VI(+)
VI(-)
Von/off
+
Ion/off
REMOTE
ON/OFF
8-758(C).a
Figure 14. Remote On/Off Implementation
Output Voltage Adjustment
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 VO(+) or VO(–) pins. With an external resistor between the TRIM and VO(+) pins (Radj-down), the output voltage set point (VO, adj) decreases. With an
external resistor between the TRIM pin and VO(–) pin (Radj-up), VO, adj increases.
The following equations determine the required external resistor value to obtain an output voltage change of ý%:
c [ d • ( 1 – Δ% ) – 1 ]
R adj-down = ---------------------------------------------------- – b kΩ
Δ%
a
R adj-up = ------------------- – b kΩ
d • Δ%
Device
a
b
c
d
–5% VO Radj-down
+5% VO Radj-up
LW020G
LW020F
LW020A
LW020B
LW020C
14.0
14.0
4.02
15.40
21.50
51.10
51.10
16.90
15.40
16.90
7.02
5.19
2.01
1.58
1.76
2.0
2.70
2.0
9.80
12.24
75.3 k¾
110.9 k¾
19.3 k¾
246.5 k¾
356.3 k¾
88.9 k¾
52.8 k¾
23.3 k¾
16.0 k¾
18.2 k¾
The adjusted output voltage cannot exceed 110% of the nominal output voltage between the VO(+) and VO(–) terminal.
The modules have a fixed current-limit set point. Therefore, as the output voltage is adjusted down, the available
output power is reduced. In addition, the minimum output current is a function of the output voltage. As the output
voltage is adjusted down, the minimum required output current can increase.
10
Lineage Power
LW020 Single-Output-Series Power Modules:
36 Vdc to 75 Vdc Inputs; 20 W
Data Sheet
April 2008
Feature Descriptions (continued)
power of the module should not exceed the rated
power for the module as listed in the Ordering Information table.
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 operates 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 thermally coupled to the case.
Heat is removed by conduction, convection, and radiation to the surrounding environment. Proper cooling
can be verified by measuring the case temperature.
Peak case temperature (TC) occurs at the position indicated in Figure 15.
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 components in the system. Therefore, the natural convection 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.
POWER DISSIPATION, PD (W)
7
MAX CASE
TEMPERATURE
6
5
4
NATURAL
CONVECTION
1.0 ms-1 (200 ft./min.)
2.0 ms-1 (400 ft./min.)
3.0 ms-1 (600 ft./min.)
3
2
1
0
40
Figure 15. Case Temperature Measurement
Location
50
60
70
80
90
100
110
120
MAX AMBIENT TEMPERATURE, TA (˚C)
8-1264(C).a
Note that the view in Figure 15 is of the metal surface
of the module—the pin locations shown are for reference. The temperature at this location should not
exceed the maximum case temperature indicated in
the derating curve shown in Figure 16. The output
Lineage Power
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
11
LW020 Single-Output-Series Power Modules:
36 Vdc to 75 Vdc Inputs; 20 W
Data Sheet
April 2008
Thermal Considerations (continued)
6
POWER DISSIPATION, PD (W)
Heat Transfer (continued)
POWER DISSIPATION, PD (W)
4.5
4.0
3.5
3.0
2.5
VI = 36 V
VI = 48 V
VI = 75 V
1.0
0.5
0.4
0.9
1.4
1.9
2.4
2.9
4
VI = 75
3
2
VI = 54
VI = 36
1
0
0.0
2.0
1.5
5
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
OUTPUT CURRENT, IO (A)
8-1479(C)
3.4
3.9
Figure 19. LW020B Power Dissipation vs. Output
Current, TA = 25 °C
OUTPUT CURRENT, IO (A)
8-1478(C).a
POWER DISSIPATION, PD (W)
6
5
4
4.5
POWER DISSIPATION, PD (W)
Figure 17. LW020F and G Power Dissipation vs.
Output Current, TA = 25 °C
4.0
3.5
VI = 75
3.0
2.5
2.0
1.5
VI = 36
0.5
0.0
0.0
3
VI = 54
1.0
0.2
0.4
0.6
0.8
1.0
1.2
OUTPUT CURRENT, IO (A)
2
VI = 75
VI = 48
VI = 36
1
8-1477(C)
0
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
Figure 20. LW020C Power Dissipation vs. Output
Current, TA = 25 °C
OUTPUT CURRENT, IO (A)
8-1275(C).a
Figure 18. LW020A Power Dissipation vs. Output
Current
12
Lineage Power
LW020 Single-Output-Series Power Modules:
36 Vdc to 75 Vdc Inputs; 20 W
Data Sheet
April 2008
Thermal Measurements
The derating curves in Figure 16 were derived from measurements obtained in an experimental apparatus shown
in Figure 21. Note that the module and the printed-wiring board (PWB) that it is mounted on are vertically oriented.
The passage has a rectangular cross section.
FACING PWB
PWB
MODULE
AIR VELOCITY
AND AMBIENT
TEMPERATURE
MEASURED
BELOW THE
MODULE
AIRFLOW
76 (3.0)
13 (0.5)
Note: Dimensions are in millimeters and (inches).
8-1126(C).d
Figure 21. Experimental Test Setup
Layout Considerations
Copper paths must not be routed beneath the power module standoffs.
Lineage Power
13
LW020 Single-Output-Series Power Modules:
36 Vdc to 75 Vdc Inputs; 20 W
Data Sheet
April 2008
Outline Diagram
Dimensions are in millimeters and (inches). Copper paths must not be routed beneath the power module standoffs.
Tolerances: x.x ± 0.5 mm (0.02 in.), x.xx ± 0.25 mm (0.010 in.). Pin-to-pin tolerances are not cumulative.
Note: For standard modules, VI(+) is internally connected to the case.
Top View
Pin
Function
1
REMOTE
ON/OFF
2
No Connection (sync feature optional)
3
VI(–)
4
VI(+)
5
CASE Pin
(pin optional)
6
TRIM
7
VO(–)
8
VO(+)
Side View
Bottom View
8-1198(C).g
14
Lineage Power
LW020 Single-Output-Series Power Modules:
36 Vdc to 75 Vdc Inputs; 20 W
Data Sheet
April 2008
Recommended Hole Pattern
Component-side footprint.
Dimensions are in millimeters and (inches).
2.5
(0.10)
12.7
(0.50)
20.32
(0.800)
15.24
(0.600)
50.8 (2.00)
45.72 (1.800)
12.4
(0.49)
5.08
(0.200)
2.54 (0.100)
7.62 (0.300)
10.16
(0.400)
50.8
(2.00)
17.78
(0.700)
37.8
(1.49)
3.43
(0.135)
38.86
(1.530)
CASE OUTLINE
DRILL HOLE OF APPROX.
2.54 (0.100) DIAMETER
TO RECESS STANDOFFS
IF LOWER HEIGHT IS NEEDED
8-1198(C).g
Ordering Information
Table 4. Device Codes
Input Voltage
Output Voltage
Output Power
Device Code
Comcode
48 V
2.5 V
10 W
LW020G
108258195
48 V
3.3 V
13.2 W
LW020F
107640807
48 V
5V
20 W
LW020A
107314304
48 V
12 V
20 W
LW020B
107681033
48 V
15 V
20 W
LW020C
107640799
Optional features may be ordered using the device code suffixes shown. To order more than one option, list suffixes in numerically descending order. Please contact your Lineage Power Account Manager or Field Application Engineer for pricing and availability.
Table 5. Device Options
Option
Short pins: 2.79 mm ± 0.25 mm
(0.110 in. ± 0.010 in.)
Case ground pin
Short pins: 3.68 mm ± 0.25 mm
(0.145 in. ± 0.010 in.)
Synchronization
Negative remote on/off logic
Lineage Power
Device Code Suffix
8
7
6
3
1
15
LW020 Single-Output-Series Power Modules:
36 Vdc to 75 Vdc Inputs; 20 W
Data Sheet
April 2008
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T el: +65 6 41 6 4283
World W ide Headq u arters
Lin eag e Po wer Co rp oratio n
30 00 Sk yline D riv e, Mesquite, T X 75149, U SA
+1-800-526-7819
(Outs id e U .S.A .: +1- 97 2-2 84 -2626)
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e-m ail: tech sup [email protected] lin ea gep ower.co m
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T el: +49 8 9 6089 286
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applic ation. No rights under any patent acc ompany the sale of any s uc h pr oduct(s ) or information.
© 2008 Lineage Power Corpor ation, (Mesquite, Texas ) All International Rights Res er ved.
April 2008
DS00-059EPS (Replaces DS00-058EPS)