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

Specifications subject to change without notice.

B_S(D)-W2

A/4-2009

Page 2 of 3

OUTPUT SPECIFICATIONS

APPLICATION NOTE

Item

Test conditions

Min.

Typ.

Max.

Units

Output power

0.25

W

For Vin change of 1%(3.3V output)

±1.5

Line regulation

For Vin change of 1%(others output)

±1.2

10% to 100% load(3.3 output)

15

20

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

50

75

mVp-p

Switching frequency Full load, nominal input

110

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

TYPICAL CHARACTERISTICS

RECOMMENDED CIRCUIT

Requirement on output load

To ensure this module can operate efficiently and reliably, During operation, 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.

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).

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. It

’s not recommended to connect any external

capacitor in the application field.

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).

Overload Protection

Under normal operat ing 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

L

Vin

GND

+Vo

0V

DC

Cin

L

DC

Cout

(Figure 1)

Vin

GND

Vin

GND

REG

+Vo

0V

+Vo

DC DC

DC

DC

REG

0V

(Figure 2)