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Specifications subject to change without notice.

WRA_SP-3W & WRB_SP-3W

A/1-2008

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

No-load power consumption

0.2

W

Isolation voltage

Tested for 1 minute and 1 mA max 1500

VDC

Isolation resistance

Test at 500VDC

1000

M

Ω

Isolation Capacitance

Input/Output

100

pF

Cooling

Free air convection

Short circuit protection

Continuous, automatic recovery

Case material

Aluminium alloy

MTBF

1000

K hours

Weight

15

g

Note:

1. All specifications measured at TA=25

°C, humidity<75%, nominal input voltage and rated output load

unless otherwise specified.

2.See below recommended circuits for more details.

TYPICAL CHARACTERISTICS

Operating Temp.(

)

C

100

OUTLINE DIMENSIONS& PIN CONNECTIONS

FOOTPRINT DETAILS

Pin

Single

Dual

Note:

Unit:mm(inch)

Pin diameter:0.80m m(0.031inch)

Pin diameter toleranc es: 0.05mm( 0.002inc h)

General to lerances: 0.25mm( 0.010inch)

5

4

1

2

3

Vin

+Vo

0V

Vin

GND

+Vo

-Vo

No Pin

0V

GND

First Angle Projec tion

35.00

2.90

2

1

3

5

4

29.21(1.150)

(1.378)

(0.11 4)

0.50

(0.020)

(Bottom View)

(Side 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_SP-3W & WRB_SP-3W Series

have been tested according to the following

recommended testing circuit

before leaving

factory (Figure 1). This series should be tested

under load.

DC

DC

Vin

GND

+Vout

0V

Cin

Vin

GND

+Vout

0V

Cin

DC

DC

-Vout

Single 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:

5V&12V

100

μF

24V&48V

10

μF-47μF

Cout: 10

μF/100mA

Output External Capacitor Table(Table 1)

Single Vout

(VDC)

Cout

(uF)

Dual Vout

(VDC)

Cout

(uF)

5

1000

±5

680

9

680

±9

470

12

470

±12

330

15

330

±15

220

24

220

-

-

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. (Figure 2)

General: Ip

≤1.4*Iin-max

Input Voltage (V)

Input Voltage

Range

Ip

No parallel connection or plug and play.