The copyright and authority for the interpretation of the products are reserved by MORNSUN

Specifications subject to change without notice.

D_T-1W

B/1-2012

Page 2 of 3

OUTPUT SPECIFICATIONS

APPLICATION NOTE

Item

Test Conditions

Min.

Typ.

Max.

Unit

Output power

0.1

1

W

Line regulation

For Vin change of

±1%

±1.2

10% to 100% load(5V output)

12.8

15

10% to 100% load(9V output)

8.3

10

10% to 100% load(12V output)

6.8

10

Load regulation

10% to 100% load(15V output)

6.0

10

%

Output voltage accuracy

See tolerance envelope graph

Temperature drift

100% full load

±0.03

%/

°C

Ripple & Noise*

20MHz Bandwidth

50

75

mVp-p

Switching frequency

Full load, nominal input

100

KHz

*Test ripple and noise by

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

Power Converter section, application notes.

Operating Temp.( C)

o

RECOMMENDED REFLOW SOLDERING PROFILE

RECOMMENDED CIRCUIT

0

50

100

150

200

250

Time ( sec .)

22 0C

o

1 0

M ax

S ec

260C

o

90

Max

(>220 C)

o

Sec

Remark: The curve applies only to the hot air reflow soldering

TYPICAL CHARECTERISTICS

1) 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 (D_T

–W2/W5).

2) 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).

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).

3) 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).

4) 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.

5) Cannot use in parallel and hot swap

Vin

GND

Vo1

0V1

DC

C

L

DC

C

Vo2

0V2

L

C

L

(Figure 1)

Vin

GND

REG

Vin

GND

REG

Vo1

0V1

Vo1

0V1

DC

DC

DC

DC

Vo2

0V2

REG

Vo2

0V2

(Figure2)

EXTERNAL CAPACITOR TABLE (TABLE 1)

Vin

(VDC)

Cin

(

µF)

Vout

(VDC)

Cout

(

µF)

5

4.7

5

4.7

12

2.2

9

2.2

-

-

12

1

-

-

15

0.47

It

’s not recommended to connect any external

capacitor in the application field with less than 0.5 watt

output.