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

Specifications subject to change without notice.

H_RN-2W & H_LT-2W

C/0-2012

Page 2 of 3

OUTPUT SPECIFICATIONS

TYPICAL CHARACTERISTICS

Item

Test Conditions

Min.

Typ.

Max.

Units

Output power

0.2

2

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

15

10% to 100% load (12V output)

6.8

15

Load regulation

10% to 100% load (15V output)

6.3

15

%

Output voltage accuracy

See tolerance envelope graph

Temperature drift

100% full load

±0.03

%/

°C

Ripple & Noise*

20MHz Bandwidth

150

200

mVp-p

Switching frequency

Full load, nominal input

50

KHz

*Test ripple and noise by

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

Power Converter. Section, application notes.

RECOMMENDED REFLOW SOLDERING PROFILE

0

50

1 00

1 50

2 00

2 50

Tim e (s ec .)

2 20

1 0

Max

Se c

P ea k. Te mp 2 60

90

M ax

(>22 0

)

S ec

C

C

C

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

Operating Temp.( C)

o

APPLICATION NOTE

RECOMMENDED CIRCUIT

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.

2) Recommended testing and application 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).

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).

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 (Figure 2).

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) No parallel connection or plug and play

L

Vin

GND

+Vo

0V

DC

Cin

L

DC

Cout

(Figure 1)

Vin

GND

0V

+Vo

DC

DC

REG

Vin

GND

0V

+Vo

DC

DC

REG

(Figure 2)

EXTERNAL CAPACITOR TABLE (TABLE 1)

Vin

(VDC)

Cin

(

µF)

Single Vout

(VDC)

Cout

(

µF)

5

4.7

5

10

12

2.2

9

4.7

24

1

12

2.2

--

--

15

1

It

’s not recommended to connect any external

capacitor in the application field with less than

0.5 watt output.