LW020BC_技术文档

Data Sheet

April 2008

LW020 Single-Output-Series Power Modules:

36 Vdc to 75 Vdc Inputs; 20 W

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

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.

n UL* 1950 Recognized, CSA^†C22.2 No. 950-95

Certified, VDE^‡0805 (EN60950, IEC950) Licensed

Applications

n CE mark meets 73/23/EEC and 93/68/EEC

directives^§

n Distributed power architectures

n Communication equipment

n Computer equipment

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%.

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.)

* 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.)

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

Input Voltage:

Continuous

V^I

VI, trans

0

80

100

Vdc

V

Transient (100 ms)

Operating Case Temperature

T^C

–40

110*

°C

(See Thermal Considerations section.)

Storage Temperature

I/O Isolation Voltage

T^stg

—

–40

—

120

°C

1500

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

Symbol

V^I

Min

36

Typ

48

Max

75

Unit

Vdc

A

Maximum Input Current

I^{I, max}

—

1.1

(V^I= 0 V to VI, max; IO = IO, max; see Figure 1.)

Inrush Transient

i²t

I^I

—

3

0.1

—

A²s

Input Reflected-ripple Current

mAp-p

(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)

—

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

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

(V^I= 48 V; IO = IO, max; TC = 25 °C)

LW020G

LW020F

LW020A

LW020B

LW020C

V^{O, 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

Output Voltage

(Over all line, load, and temperature

conditions until end of life; see Figure 13.)

LW020G

LW020F

LW020A

LW020B

LW020C

V^O

VO

2.4

3.20

4.85

11.64

14.55

—

2.6

3.40

5.15

12.36

15.45

Vdc

Output Regulation:

Line (V^I= 36 V to 75 V)

Load (I^O= IO, min to IO, max)

Temperature (T^C= –40 °C to +100 °C)

All

—

0.01

0.05

0.5

0.1

0.2

1.0

%V^O

%VO

Output Ripple and Noise Voltage

(See Figure 12.):

RMS

LW020A, F,

G

LW020B, C

LW020A, F,

G

—

20

50

20

50

100

150

mVrms

mVp-p

Peak-to-peak (5 Hz to 20 MHz)

LW020B, C

Output Current

(At I^O< IO, min, the modules may exceed

output ripple specifications.)

LW020A, F,

G

LW020B

LW020C

I^O

IO

0.4

0.17

0.13

—

4.0

1.67

1.33

A

Output Current-limit Inception

All

I^O

103

—

150

%IO, max

(V^O= 90% x VO, set; see Figure 2.)

Output Short-circuit Current

(V^O= 250 mV)

LW020C

LW020B

LW020A, F,

G

I^O

IO

—

150

250

220

200

%IO, max

Efficiency

LW020G

LW020F

LW020A

LW020B

LW020C

η

71

74

77

82

75

77

81

85

—

%

(V^{I, nom}; IO = IO, max; TC = 25 °C; see Figures

3—7 and 13.)

Switching Frequency

All

—

256

—

kHz

Dynamic Response

(ýI^O/ýt = 1 A/10 µs, VI = VI, nom, TA = 25 °C):

Load Change from I^O= 50% to 75% of

I^{O, max}:

Peak Deviation

Settling Time (V^O< 10% peak

deviation)

All

—

2

1.0

—

%V^{O, set}

ms

Load Change from I^O= 50% to 25% of

I^{O, max}:

Peak Deviation

Settling Time (V^O< 10% peak

deviation)

All

—

2

1.0

—

%V^{O, set}

ms

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

Isolation Capacitance

Min

—

Typ

0.002

—

Max

—

Unit

µF

Isolation Resistance

10

—

M¾

General Specifications

Parameter

Calculated MTBF (I^O= 80% of IO, max; TC = 40 °C)

Weight

Min

Typ

4,500,000

—

Max

Unit

hours

g (oz.)

—

54 (1.9)

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

Device Symbol

Min

Typ

Max

Unit

Remote On/Off Signal Interface:

(V^I= 0 V to VI, 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:

All

I^on/off

—

1.0

mA

Logic Low

Logic High (I^on/off= 0)

All

Von/off

–0.7

—

1.2

10

V

Open Collector Switch Specifications:

Leakage Current During Logic High

(V^on/off= 10 V)

All

Ion/off

—

50

µA

V

Output Low Voltage During Logic Low

(I^on/off= 1 mA)

Von/off

1.2

4

Lineage Power

LW020 Single-Output-Series Power Modules:

36 Vdc to 75 Vdc Inputs; 20 W

Data Sheet

April 2008

Feature Specifications (continued)

Parameter

Device

Symbol

Min

Typ

Max

Unit

Turn-on Delay and Rise Times

(at 80% of I^{O, 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 V^I= 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 V^O= 10% of

V^{O, nom}).

All

T^delay

—

27

2

50

10

ms

Tdelay

Output Voltage Rise Time (time for V^Oto rise

from 10% of V^{O, nom}to 90% of VO, nom)

Output Voltage Overshoot (at 80% of I^{O, max};

T^A= 25 °C)

All

Trise

—

1.5

—

3.0

5

ms

%

—

Output Voltage Set-point Adjustment Range

LW020B

All others

—

83

90

—

110

%V^{O, nom}

%VO, nom

Output Overvoltage Protection (clamp)

LW020G V^{O, clamp}

2.9

3.9

5.6

13.2

16.5

—

3.8

5.0

7.0

16.5

20.0

V

LW020F

LW020A

LW020B

LW020C

VO, clamp

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5

LW020 Single-Output-Series Power Modules:

36 Vdc to 75 Vdc Inputs; 20 W

Data Sheet

April 2008

Characteristics Curves

76

74

1.0

0.9

72

70

68

66

64

PO = 20 W

PO = 10 W

PO = 2 W

0.8

0.7

0.6

0.5

0.4

0.3

0.2

VI = 36 V

VI = 48 V

VI = 75 V

62

60

0.4

0.9

1.4

1.9

2.4

2.9

3.4

3.9

0.1

0.0

OUTPUT CURRENT, I^O(A)

8-1483(C).a

0

10

20

30

40

50

60

70

80

INPUT VOLTAGE, V ^I(V)

Figure 3. LW020G Typical Converter Efficiency vs.

Output Current, T^A= 25 °C

8-1481(C).a

Figure 1. LW020 Typical Input Characteristics,

T^A= 25 °C

80

79

100%

78

77

76

75

74

V^O, nom

80%

V^O, nom

60%

V^O, nom

VI = 75

V

I = 75

V^I= 54

V^I= 36

73

72

I = 54

40%

V^O, nom

I =

36

71

70

0.0

20%

V^O, nom

0.5

1.0

1.5

2.0

2.5

(A)

3.0

3.5 4.0

0

OUTPUT CURRENT, I

O

50%

100%

150%

0

I^O, max

IO, max

8-1483(C)

NORMALIZED OUTPUT CURRENT, I^O(A)

8-1258(C).a

Figure 4. LW020F Typical Converter Efficiency vs.

Output Current, T^A= 25 °C

Figure 2. LW020A, B, C, F, and G Typical Output

Characteristics, T^A= 25 °C

6

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

84

82

80

78

80

79

78

V

I

= 75

= 54

= 36

76

74

VI

77

VI = 36

VI

76

75

74

VI = 54

VI = 75

72

70

0.0

0.2

0.4

0.6

0.8

(A)

1.0

1.2

73

72

OUTPUT CURRENT, I

O

8-1485(C)

0.0 0.5

1.0

1.5

2.0

2.5

3.0

3.5 4.0

OUTPUT CURRENT, IO (A)

Figure 7. LW020C Typical Converter Efficiency vs.

Output Current, T^A= 25 °C

8-1260(C).a

Figure 5. LW020A Typical Converter Efficiency vs.

Output Current

86

84

100%

VO, nom

99%

VO, nom

82

80

78

VI = 75

76

VI = 54

74

VI = 36

75%

IO, max

72

70

50%

IO, max

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4 1.6

OUTPUT CURRENT, IO (A)

8-1484(C)

TIME, t (100 µs/div)

Figure 6. LW020B Typical Converter Efficiency vs.

Output Current, T^A= 25 °C

8-1262(C).a

Figure 8. LW020A, B, C, F, and G Typical Output

Voltage for a Step Load Change from 50%

to 75%

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7

LW020 Single-Output-Series Power Modules:

36 Vdc to 75 Vdc Inputs; 20 W

Data Sheet

April 2008

Characteristics Curves (continued)

Test Configurations

TO OSCILLOSCOPE

CURRENT

PROBE

LTEST

101%

VO, nom

VI(+)

12 µH

100%

, nom

CS 220 µF

IMPEDANCE < 0.1 Ω

@ 20 ˚C, 100 kHz

V

O

33 µF

BATTERY

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%

I

O

, max

25%

I

O, max

Figure 11. Input Reflected-Ripple Test Setup

TIME, t (100 µs/div)

8-1261(C).b

COPPER STRIP

Figure 9. LW020A, B, C, F, and G Typical Output

Voltage for a Step Load Change from 50%

to 25%

V

O

(+)

(-)

RESISTIVE

LOAD

0.1 µF

SCOPE

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%

O, nom

V

CONTACT AND

DISTRIBUTION LOSSES

VI(+)

V^I(-)

V^O(+)

V^O(-)

I^I

IO

LOAD

0

SUPPLY

TIME, t (1 ms/div)

CONTACT RESISTANCE

8-1263(C).b

8-204(C)

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 10. LW020A, B, C, F, and G Typical Output

Voltage Start-Up when Signal Applied to

Remote On/Off

[VO(+) – VO(–)]IO

⎛

⎝

⎞

⎠

------------------------------------------------

η =

× 100

%

[VI(+) – VI(–)]II

Figure 13. Output Voltage and Efficiency

Measurement Test Setup

8

Lineage Power

LW020 Single-Output-Series Power Modules:

36 Vdc to 75 Vdc Inputs; 20 W

Data Sheet

April 2008

The power module has extra-low voltage (ELV) outputs

when all inputs are ELV.

Design Considerations

Grounding Considerations

The input to these units is to be provided with a maxi-

mum 5 A normal-blow fuse in the ungrounded lead.

For standard units, the case is connected internally to

V^I(+). For units with the case ground pin option, the

case is not connected internally allowing the user flexi-

bility in grounding.

Feature Descriptions

Overcurrent Protection

Input Source Impedance

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 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.

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 11, a 33 µF

electrolytic capacitor (ESR < 0.7 ¾ 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 Overvoltage Protection

Safety Considerations

The output overvoltage clamp consists of control cir-

cuitry, independent of the primary regulation loop, that

monitors the voltage on the output terminals. The con-

trol loop of the protection circuit 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

V^{O, clamp, max}. This provides a redundant voltage-control

that reduces the risk of output overvoltage.

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:

Remote On/Off

n The input source is to be provided with reinforced

insulation from any other hazardous voltages, includ-

ing the ac mains.

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.

n One VI pin and one VO pin are to be grounded or

both the input and output pins are to be kept floating.

n The input pins of the module are not operator acces-

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 V^I(–) terminal (Von/off). The

switch can be an open collector or equivalent (see Fig-

ure 14). A logic low is V^on/off= –0.7 V to 1.2 V. The max-

imum I^on/offduring a logic low is 1 mA. The switch

should maintain a logic-low voltage while sinking 1 mA.

sible.

n 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.

During a logic high, the maximum V^on/offgenerated by

the power module is 6 V. The maximum allowable leak-

age current of the switch at V^on/off= 6 V is 50 µA.

Lineage Power

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.

V^I(+)

V^I(-)

-

Von/off

+

REMOTE

ON/OFF

Ion/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 accom-

plished by connecting an external resistor between the TRIM pin and either the V^O(+) or VO(–) pins. With an exter-

nal resistor between the TRIM and V^O(+) pins (Radj-down), the output voltage set point (VO, adj) decreases. With an

external resistor between the TRIM pin and V^O(–) 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% V^ORadj-down

+5% VO Radj-up

LW020G

LW020F

LW020A

LW020B

LW020C

14.0

51.10

16.90

15.40

16.90

7.02

5.19

2.01

1.58

1.76

2.0

2.70

2.0

75.3 k¾

110.9 k¾

19.3 k¾

88.9 k¾

52.8 k¾

23.3 k¾

16.0 k¾

18.2 k¾

4.02

15.40

21.50

9.80

12.24

246.5 k¾

356.3 k¾

The adjusted output voltage cannot exceed 110% of the nominal output voltage between the V^O(+) and VO(–) ter-

minal.

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

power of the module should not exceed the rated

power for the module as listed in the Ordering Informa-

tion table.

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 V^I(+).

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 (T^A) for natural convection

through 3.0 ms^–1(600 ft./min.).

Thermal Considerations

Introduction

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.

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 (T^C) occurs at the position indi-

cated in Figure 15.

Example

What is the minimum airflow necessary for a LW020A

operating at V^I= 48 V, an output current of 3.6 A, and a

maximum ambient temperature of 85 °C?

Solution:

Given: V^I= 48 V, IO = 3.6 A, TA = 85 °C

Determine P^D(Figure 18): PD = 4.5 W

Determine airflow (Figure 16): v = 1.0 ms^–1

(200 ft./min.)

7

MAX CASE

TEMPERATURE

6

5

4

NATURAL

CONVECTION

3

-1

1.0 ms (200 ft./min.)

2.0 ms^-1(400 ft./min.)

2

3.0 ms^-1(600 ft./min.)

8-1265(C)

1

0

Note: Dimensions are in millimeters and (inches). Pin locations are

for reference only.

40

50

60

70

80

90

100

110 120

Figure 15. Case Temperature Measurement

Location

MAX AMBIENT TEMPERATURE, T^A(˚C)

8-1264(C).a

Note: Conversion factor for linear feet per minute to meters per

second: 200 ft./min. = 1 ms^–1

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

.

Figure 16. Forced Convection Power Derating;

Either Orientation

Lineage Power

11

LW020 Single-Output-Series Power Modules:

36 Vdc to 75 Vdc Inputs; 20 W

Data Sheet

April 2008

Thermal Considerations (continued)

Heat Transfer (continued)

6

5

4

3

4.5

4.0

VI = 75

3.5

3.0

2.5

2

1

0

VI = 54

VI = 36

2.0

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4 1.6

VI = 36 V

VI = 48 V

1.5

OUTPUT CURRENT, IO (A)

VI = 75 V

8-1479(C)

1.0

0.5

0.4

Figure 19. LW020B Power Dissipation vs. Output

Current, T^A= 25 °C

0.9

1.4

1.9

2.4

2.9

3.4

3.9

OUTPUT CURRENT, IO (A)

8-1478(C).a

4.5

4.0

Figure 17. LW020F and G Power Dissipation vs.

Output Current, T^A= 25 °C

3.5

VI = 75

3.0

2.5

2.0

1.5

1.0

6

5

VI = 54

VI

= 36

0.8

4

3

0.5

0.0

0.2

0.4

0.6

1.0

1.2

OUTPUT CURRENT, IO (A)

2

VI = 75

VI = 48

VI = 36

1

0

8-1477(C)

Figure 20. LW020C Power Dissipation vs. Output

Current, T^A= 25 °C

0.0 0.5

1.0

1.5

2.0

2.5

3.0

3.5 4.0

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

76 (3.0)

AIRFLOW

BELOW THE

MODULE

13 (0.5)

8-1126(C).d

Note: Dimensions are in millimeters and (inches).

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, V^I(+) is internally connected to the case.

Top View

Function

1

REMOTE

ON/OFF

2

No Connec-

tion (sync fea-

ture optional)

3

4

5

VI(–)

VI(+)

CASE Pin

(pin optional)

6

7

8

TRIM

VO(–)

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).

50.8 (2.00)

2.5

(0.10)

45.72 (1.800)

12.7

(0.50)

12.4

(0.49)

5.08

(0.200)

2.54 (0.100)

50.8

(2.00)

7.62 (0.300)

17.78

10.16

(0.400)

15.24

(0.600)

20.32

(0.800)

(0.700)

37.8

(1.49)

3.43

(0.135)

38.86

(1.530)

DRILL HOLE OF APPROX.

2.54 (0.100) DIAMETER

TO RECESS STANDOFFS

CASE OUTLINE

IF LOWER HEIGHT IS NEEDED

8-1198(C).g

Ordering Information

Table 4. Device Codes

Input Voltage

48 V

Output Voltage

Output Power

10 W

Device Code

LW020G

LW020F

Comcode

108258195

2.5 V

3.3 V

5 V

48 V

13.2 W

20 W

107640807

107314304

107681033

107640799

48 V

LW020A

48 V

12 V

15 V

20 W

LW020B

48 V

20 W

LW020C

Optional features may be ordered using the device code suffixes shown. To order more than one option, list suf-

fixes in numerically descending order. Please contact your Lineage Power Account Manager or Field Applica-

tion Engineer for pricing and availability.

Table 5. Device Options

Option

Device Code Suffix

Short pins: 2.79 mm ± 0.25 mm

(0.110 in. ± 0.010 in.)

8

Case ground pin

7

6

Short pins: 3.68 mm ± 0.25 mm

(0.145 in. ± 0.010 in.)

Synchronization

3

1

Negative remote on/off logic

Lineage Power

15

LW020 Single-Output-Series Power Modules:

36 Vdc to 75 Vdc Inputs; 20 W

Data Sheet

April 2008

Asia-Pacific Headquarters

Tel: +65 641 6 4283

Europe, Middle-East and Afric a He adquarters

Tel: +49 89 6089 286

World Wide Headquarters

Lineage Power Corporation

30 00 Skyline Drive, Mesquite, TX 75149, USA

+1-800-526-7819

India Headquarters

Tel: +91 80 28411633

(Outsid e U.S.A .: +1-97 2-2 84 -2626)

www.line agepower.com

e-m ail: techsupport1@linea gepower.com

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.

April 2008

DS00-059EPS (Replaces DS00-058EPS)


型号：	LW020BC
厂家：	VISHAY
描述：	LW020 Single-Output-Series Power Modules 36 Vdc to 75 Vdc inputs 20W LW020单路输出系列电源模块36 VDC至75 VDC输入20W 电源电路
文件：	总16页 (文件大小：426K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

LW020BC [VISHAY]

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