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Specifications subject to change without notice.

WRA_CKS-1W & WRB_CKS-1W

A/0-2008

Page 2 of 2

COMMON SPECIFICATION

APPLICATION NOTE

Item

Test Conditions

Min

Typ

Max

Units

Storage Humidity

95

%

Operating Temperature

-40

85

Storage Temperature

-50

125

Temp. Rise at Full Load

15

35

Lead Temperature

1.5mm from case for 10 seconds

300

°C

Isolation voltage

Tested for 1 minute and 1mA max

1500

VDC

Isolation resistance

Test at 500VDC

1000

M

Ω

Isolation Capacitance

100KHz,1V

35

PF

No-load power consumption

120

mW

Cooling

Free Air Convection

Short Circuit Protection

Continuous, Automatic recovery

Case Material

Plastic(UL94-V0)

MTBF

1000

K hours

Weight

5

g

Note:

otherwise specified.

2. Test ripple and noise by

“parallel cable” method. See detailed operation instructions at Testing of Power

Converter section, application notes.

3. Operation under 10% load will not damage the converter; However, they may not meet all specification listed.

4. See below recommended circuits for more details.

TYPICAL TEMPERATURE CURVE

Operating Temp.(

)

C

100

OUTLINE DIMENSIONS & FOOTPRINT DETAILS

FOOTPRINT DETAILS

RECOMMENDED FOOTPRINT

diameter:1.00mm(0.039inch)

Note:

Unit:mm(inch)

Pin section:0.50*0.30mm(0.020*0.012inch)

Pin section tolerances: 0.10mm( 0.004inch)

General tolerances: 0.25mm( 0.010inch)

Dual/Single Output

Pin

Single

Dual

1

2

3

5

GND

Vin

+Vo

NC

0V

7

8

6

CTRL

-Vo

GND

Vin

+Vo

NC

0V

CTRL

CS

22.00 (0.866)

2 35

2

6 78

1

NC:No Connection

First Angle Projection

3

5

Side View

Bottom View

Recommended circuit

If you want to further decrease the input/output

ripple, an

“LC” filtering network may be connected

to the input and output ends of the DC/DC

converter, see (Figure 1).

Single Output

+Vo

0V

Co ut

6

7

8

Cs

Cin

Vin

G ND

2

1

3

Vc

R

Lin

Ic

D1

Dual Output

+Vo

0V

Cout

6

8

7

Cout

L out

L out

-Vo

C in

V in

G ND

2

1

3

Vc

R

Lin

Ic

D1

(Figure 1)

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

10uF

Cout:

47

μF(typ)

Lin:

4.7

μH -120μH

Lout:

2.2

μH-10μH

Cs:

10uF-22uF

External Capacitor Table(Table 1)

Single Vout

(VDC)

Cout

(uF)

Dual Vout

(VDC)

Cout

(uF)

5

680

±5

330

9

560

±9

270

12

470

±12

220

15

330

±15

150

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 (Ic) should between 5-10mA, exceeding

the maximum

20mA will cause permanence

damage to the converter. The value of R Can be

derived as follows :

R=

Input current

While using unstable power source, please

ensure the output voltage and ripple voltage do

not

excced

indexes

of

the

converter.

The

preceding power source must be able to provide

for converter sufficient starting current Ip (Figure

2).General:

Ip

≤1.4*Iin-max

Input Voltage (V)

Input Voltage

Range

Ip

No parallel connection or plug and play.

Ic