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Specifications subject to change without notice.

WRA_CS-2W & WRB_CS-2W

A/3-2012

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

Input/Output, 100KHz/1V

80

PF

No-load power consumption

100

mW

Cooling

Free Air Convection

Short Circuit Protection

Continuous

Case Material

Plastic(UL94-V0)

MTBF

1000

K hours

Weight

5.5

g

OUTPUT SPECIFICATIONS

Item

Test Conditions

Min

Typ

Max

Units

Output Voltage accuracy Input voltage range refer to output load

±1

±3

10% to 100% load(WRB_CS-2W)

±0.5

±0.75

Load Regulation

10% to 100% load(WRA_CS-2W)

±0.5

±1.0

Line Regulation

Input voltage from Low To high

±0.2

±0.5

%

Temperature Drift (Vout)

Refer to recommended circuit

±0.03

%/

°C

Ripple & Noise *

20MHz Bandwidth

35

100

mVp-p

Switching Frequency

Input voltage range 100% load

180-500(PFM)

KHz

*Test ripple and noise by

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

Converter section, application notes.

Note:

otherwise specified.

2. See below recommended circuits for more details

TYPICAL TEMPERATURE CURVE

Operating Temp.(

)

C

OUTLINE DIMENSIONS & FOOTPRINT DETAILS

1

3

2

5

NC

GND

-Vo

+Vo

0V

6

CTRL

Vin

GND

+Vo

∅1.00 [0.039]

2

3

5

6

7

8

1

Vin

8

CS

7

CTRL

0V

FOOTPRINT DETAILS

Not e:

Unit :mm[inch]

Pin se ction tolera nces:

± 0.10mm[ ± 0.004inch]

Gen eral toler ances:

± 0.25mm[ ± 0.010inch]

MECHANICAL DIMENSIONS

RECOMMENDED FOOTPRINT

TUBE OUTLINE DIMENSIONS

Note:

Unit :mm[inch]

General tolerances:

± 0.50mm[ ± 0.020inch]

22.00 [0.866]

2

3

5

6

7

8

1

0.50 [0.020]

1 7.78[0. 700]

(Bottom View)

2.54[ 0.100]

(Front View)

NC: No conn ection

Pin

Single

Dual

NC

L=530mm[20.866inch] Devices per tube quantity: 22pcs

L=220mm[8.661inch]

Devices per tube quantity: 8pcs

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

12.40 [0.488]

6.40 [0.252]

Note: grid

mm

2.54*2.54.

① 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 :

C

D

C

I

V

V

R

0

.

1

−

−

=

② 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

L in

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

10

μF - 22μF

Lin:

4.7

μH -120μH

Cout:

100

μF(typ)

Lout:

2.2

μH-10μH

Cs:

10

μF - 22μF

External Capacitor Table(Table 1)

Single Vout

(VDC)

Cout

(

μF)

Dual Vout

(VDC)

Cout

(

μF)

3.3

2200

-

-

5

1000

±5

560

9

820

±9

470

12

680

±12

330

15

560

±15

270

24

470

±24

100

③ 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

④ No parallel connection or plug and play.

Input Voltage (V)

In pu t Volta ge

R an ge

Ip