MORNSUN reserves the copyright

Specifications subject to change without notice.

B_JS-2W

A/2-2012

Page 2 of 2

COMMON SPECIFICATION

Item

Test condition

Min

Typ

Max

Units

Storage humidity

95

%

Operation temperature

-40

85

Storage temperature

-55

125

Temp. rise at full load

15

25

Lead temperature

1.5mm from case for 10 seconds

300

°C

Short circuit protection*

1

s

Cooling

Free air convection

Case material

Plastic (UL94-V0)

MTBF

3500

K hours

Weight

2.9

g

*Supply voltage must be discontinued at the end of short circuit duration.

TYPICAL CHARECTERISTICS

(

)

OUTLINE DIMENSIONS & PIN CONNECTIONS

1

5

2

6

Vin

GND

0V

+Vo

4

No Pin

Pin

F uncti on

FOOTPRINT DETAILS

∅1.00 [0.039]

N ote:

U nit:mm[inch]

Pin section tolerances:

± 0.10mm[± 0.004inch]

General tolerances:

± 0.25mm[± 0.010inch]

MECHANICAL DIMENSIONS

RECOMMENDED FOOTPRINT

TUBE OUTLINE DIMENSIONS

Note:

Unit :mm[inch]

General tolerances:

±0.50mm[±0.020inch]

L=530mm[20.866inch] Tube Quantity: 25pcs

L=220mm[8.661inch]

Tube Quantity: 10pcs

(Front View)

(Bottom View)

1 2

6

4

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

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

：

：

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

Long tube inner packaging dimensions: L*W*H=580*200*100mm;

Long tube outer packaging dimensions(with two inner packaging boxes)

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

Long tube outer packaging dimensions(with three inner packaging boxes)

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

N ote: grid 2.54*2.54mm.

9.60

[0.378]

4.90 [0.193]

19.60 [0.772]

10.00 [0.394]

4.10 [0.161]

2.54 [0.100]

0.30

[0.012]

4

1

7.00 [0.276]

0.50 [0.020]

2

0.50 [0.020]

0.90 [0.035]

6

10.16

[0.400]

APPLICATION NOTE

Requirement On Output Load

To ensure this module can operate efficiently and reliably, a minimum load is specified

for this kind of DC/DC converter in addition to a maximum load (namely full load). During

operation, make sure the specified range of input voltage is not exceeded, the minimum

output load could not be less than 10% of the full load. If the actual output power is

very small, please connect a resistor with proper resistance at the output end in parallel

to increase the load, or use our company

’s products with a lower rated output power

(B_JS

–1W Series).

Overload Protection

Under normal operating conditions, the output

circuit of these products has no protection

against

over-current

and

short-circuits.

The

simplest method is to connect a self-recovery

fuse in series at the input end or add a circuit

breaker to the circuit.

Recommended and testing 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).

L

Vin

GND

+Vo

0V

DC

Cin

L

DC

Cout

(Figure 1)

It should also be noted that the inductance

and the frequency of the

“LC” filtering network

should be staggered with the DC/DC frequency

to avoid mutual interference. 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 recommended capacitance of its

filter capacitor sees (Table 1).

EXTERNAL CAPACITOR TABLE(TABLE 1)

Vin

(VDC)

Cin

(uF)

Single Vout

(VDC)

Cout

(uF)

5

4.7

5

10

12

2.2

12

2.2

15

2.2

15

1

It

’s not recommend to connect any external capacitor

in the application field with less than 0.5 watt output.

Output Voltage Regulation and Over-voltage

Protection Circuit

The simplest

device for

output

voltage

regulation,

over-voltage

and

over-current

protection is a linear voltage regulator with

overheat protection that is connected to the

input or output end in series (see Figure 2).

Vin

GND

0V

+Vout

DC

DC

REG

Vin

GND

0V

+Vout

DC DC

REG

(Figure 2)

No parallel connection or plug and play.