MORNSUN reserves the copyright

Specifications subject to change without notice.

D_T-1W

A/1-2008

Page 2 of 2

COMMON SPECIFICATIONS

APPLICATION NOTE

Item

Test Conditions

Min

Typ

Max

Units

Storage humidity

95

%

Operating temperature

-40

85

Storage temperature

-55

125

Temp. rise at full load

15

25

Lead temperature

1.5mm from case for 10 seconds

260

°C

Short circuit protection*

1

S

Cooling

Free air convection

package material

Plastic (UL94-V0)

MTBF

3500

K hours

Weight

2.1

g

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

TYPICAL CHARECTERISTICS

(

)

RECOMMENDED REFLOW SOLDERING PROFILE

0

50

100

150

200

250

Ti me ( s ec .)

22 0C

o

1 0

Max

Sec

26 0C

o

90

Max

( >220 C)

o

Sec

OUTLINE DIMENSIONS& RECOMMENDED FOOTPRINT

12 3

5 67

8

9

10

12

13

14

0 .25

A

1.27

0.25

2.75

17.78 (0.700)

FOOTPRINT DETAILS

1

2

6

5

Vin

GND

Vo1

0V1

9

Vo2

Function

NC:No connection

1 2 3

6

5

13 12

8

1.3 0.13

0.50

5.00

。

15.24(0.600)

(0.020)

(0.051)

0.005

9

10

10

NC

1.8

1.2

(0 .04 7)

(0.050)

(0.010)

(0.108)

7

14

0V2

Others

RECOMMENDE D FOOTPRINT

Note:

Unit:mm(i nch)

Pin section:0.60*0.25mm(0.024*0.010inch)

Pin section tolerances: 0.10mm( 0.004inch)

General tolerances: 0.15mm( 0.006inch)

First Angle Projection

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 is not less than 10% of the full

load, and that this product should never be operated

under no 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

(D_T

–W2/W5).

Recommended 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 (Figure1).

(Figure 1)

Vin

GND

+Vo1

0V1

DC

C

L

DC

C

+Vo2

0V2

L

C

L

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 greatest capacitance of its filter capacitor

sees (Table 1).

EXTERNAL CAPACITOR TABLE (Table 1)

Vin

(VDC)

Cin

(uF)

Vout

(VDC)

Cout

(uF)

5

4.7

5

4.7

12

2.2

9

2.2

-

-

12

1

-

-

15

0.74

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 (Figure2).

Vin

GND

REG

Vin

GND

REG

Vo1

0V1

Vo1

0V1

DC

DC

DC

DC

Vo2

0V2

REG

Vo2

0V2

(Figure2)

Overload Protection

Under normal operating conditions, the output circuit

of these products has no protection against overload.

The simplest method is to connect a self-recovery fuse

in series at the input end or add a circuit breaker to the

circuit.

No parallel connection or plug and play.