MORNSUN reserves the copyright

Specifications subject to change without notice.

F_AS-1W

A/0-2008

Page 2 of 2

COMMON SPECIFICATION

Item

Test condition

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

300

°C

Short circuit protection*

1

s

Cooling

Free air convection

Case material

Plastic (UL94-V0)

MTBF

3500

K hours

Weight

2.1

g

TYPICAL CHARECTERISTICS

Operating Temp.( C)

o

OUTLINE DIMENSIONS & FOOTPRINT DETAILS

Side View

Bottom View

RECOMMENDED FOOTPRINT

diameter:1.00mm(0.039inch)

Note:

Unit:mm(inch)

Pin section:0.50*0.30mm(0.020*0.012inch)

Pin section tolerances: 0.10mm( 0.004inch)

General tolerances: 0.25mm( 0.010inch)

+

+

+

+

1 24

1 2

4

6

6

First Angle Projection

FOOTPRINT DETAILS

Pin

Functi on

1

2

4

6

Vin

GND

+Vo

0.50

(0.020)

(0.079)

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 (nam ely 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.

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).

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)

3.3/5

4.7

3.3/5

10

12

2.2

9

4.7

15

2.2

12

2.2

24

1

15

1

It

’s not recommended 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 (Figure 2).

Vin

GND

0V

+Vout

DC DC

REG

Vin

GND

0V

+Vout

DC

DC

REG

(Figure 2)

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.