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Specifications subject to change without notice.

WRA_LS-3W

A/3-2012

Page 2 of 2

COMMON SPECIFICATIONS

Item

Test Conditions

Min

Typ

Max

Units

Storage humidity

95

%

Operating temperature

-40

85

Storage temperature

-55

125

Temp. rise at full load

15

Lead temperature

1.5mm from case for 10 seconds

300

°C

Cooling

Free air convection

Case material

Plastic (UL94-V0)

Short circuit protection

Continuous, automatic recovery

MTBF

1000

K hours

Weight

7

g

TYPICAL TEMPERATURE CURVE

Operating Temp.(

)

C

OUTLINE DIMENSIONS& PIN CONNECTIONS

12.40 [0.488]

6.40 [0.252]

1

2

3

9

GND

Vin

+Vo

NC

0V

7

8

6

CTRL

-Vo

1 2 3

6 7 89

2.54

[0.100]

23

1

78

6

9

26.00[1.024]

20.32[0.800]

0.50

[0.020]

MECHANICAL DIMENSIONS

RECOMMENDED FOOTPRINT

TUBE OUTLINE DIMENSIONS

Note:

Unit :mm[inch]

General tolerances:

± 0.50mm[± 0.020inch]

L=530mm[20.866inch] Tube Quantity: 18pcs

L=220mm[8.661inch]

Tube Quantity: 7pcs

Note:

Unit:mm[inch]

Pi n section tolerances:

± 0.10mm[± 0.004inch]

General tolerances:

± 0.25mm[± 0.010inch]

Pin

NC:N o Connection

Function

FOOTPRINT DETAILS

Short tube inner package dimensions: L*W*H= 255*170*80mm

Short tube outer package dimensions(with six inner package boxes):

L*W*H= 375*280*270mm

Long tube inner package dimensions:

L*W*H= 580*200*100mm

Long tube outer package dimensions(with two inner package boxes):

L*W*H= 600*215*220mm

Long tube outer package dimensions(with three inner package boxes):

L*W*H= 600*215*325mm

(Bottom View)

(Front View)

APPLICATION NOTE

Requirement On output Load

In order to ensure the product operate efficiently and reliably, in addition to a max load

(namely full load), a minimum load is specified for this kind of DC/DC converter. Make sure the

specified range of input voltage is not exceeded, the minimum output load no less than 10%

load. If the actual load is less than the specified minimum load, the output ripple may increase

sharply while its efficiency and reliability will reduce greatly. If the actual output power is very

small, please add an appropriate resistor as extra loading, or contact our company for other

lower output power products.

Recommended Circuit

All the WRA_LS-3W Series have been

tested according to the following recommended

testing circuit before leaving factory. This series

should be tested under load. Never be tested

under no load (see Figure 1).

Vin

GND

+Vo

0V

Cin

Co ut

DC

DC

-Vo

Cout

Dual output

(Figure 1)

If

you

want

to

further

decrease

the

input/output

ripple,

you

can

increase

capacitance properly or choose capacitors with

low ESR. However, the capacitance of the

output filter capacitor must be proper. If the

capacitance is too big, a startup problem might

arise. For every channel of output, provided the

safe and reliable operation is ensured, the

greatest capacitance of its filter capacitor sees

(Table 1). General:

Cin:

24V&48V

10

μF-100μF

Cout: 10

μF/100mA

Output External Capacitor Table(Table 1)

Dual Vo(VDC)

Cout(uF)

±12

330

±15

220

CTRL Terminal

When

open

or

high

impedance,

the

converter work well; When this pin is

‘high’; the

converter shutdown; It should be note that the

input

current

should

between

5-10mA,exceeding the maximum 20mA will

cause permanence damage to the converter.

Input current

When it is used in unregulated power supply,

be sure that the fluctuating range of the power

supply and the rippled voltage do not exceed

the module standard. Input current of power

supply should afford the startup current of this

kind of DC/DC module (See figure 2), General:

Ip

≤1.4*Iin-max

Input Voltage (V)

Input Voltage

Range

Ip

No parallel connection or plug and play.