MORNSUN reserves the copyright

Specifications subject to change without notice.

A_S-W25 & B_LS-W25

A/2-2008

Page 2 of 2

ISOLATION SPECIFICATIONS

APPLICATION NOTE

Item

Test conditions

Min

Typ

Max

Units

Isolation voltage

Tested for 1 minute and 1 mA max

1000

VDC

Isolation resistance

Test at 500VDC

1000

M

Ω

OUTPUT SPECIFICATIONS

Item

Test conditions

Min

Typ

Max

Units

Output power

0.25

W

(3.3V input)

±1.5

Line regulation

For Vin change

of

±1%

(Others input)

±1.2

(3.3V output)

12

20

(5V output)

10.5

15

(9V output)

8.3

15

(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

100

KHz

*Test ripple and noise by

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

of Power Converter section, application notes.

Note:

output load unless otherwise specified.

2. See below recommended circuits for more details.

3. Dual output models unbalanced load:

±5%.

TYPICAL CHARACTERISTICS

Operating Temp.( C)

o

OUTLINE DIMENSIONS & PIN CONNECTIONS

(0.020)

1 2

4 5 6

Dual Output

S ing le Output

Pin

Single

Dual

1

2

4

6

5

Vin

GND

0V

+Vo

No Pin

Vin

GND

-Vo

+Vo

0V

F OOTPR INT DE TA ILS

1 2

4

6

RECOMM EN DED FOOTPR INT

diam eter :1.0 0m m(0 .039inch)

N ote:

U nit:mm (inc h)

P in section:0.50*0.30mm (0.020*0.012inch)

P in section tolerances: 0.10mm( 0.004inch)

Gener al tolerance s: 0.25mm ( 0.0 10inch)

First Angle Projection

(0.083)

(0.100)

2.10

2.54

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.

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.

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).

Vin

GND

+Vo

0V

DC

Cin

L

L

DC

L Cout

Cout

-Vo

Dua l O utp ut

L

Sing le Ou tput

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. 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).

Vin

GND

0V

+Vout

DC DC

- Vout

REG

REG

REG

Dual O ut put

Single O utput

Vin

GND

0V

+Vout

DC DC

REG

REG

(Figure 2)

No parallel connection or plug and play.