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

Specifications subject to change without notice.

PWA_LT-1W5 & PWB_LT-1W5

B/3-2010

Page 2 of 3

ISOLATION SPECIFICATIONS

TYPICAL TEMPERATURE CURVE

Item

Test conditions

Min.

Typ.

Max.

Units

Isolation voltage

Tested for 1 minute and 1mA max 1500

VDC

Isolation resistance

Test at 500VDC

1000

M

Ω

Isolation capacitance

Input/Output, 100KHz/1V

1000

pF

OUTPUT SPECIFICATIONS

Item

Test conditions

Min.

Typ.

Max.

Units

Output power

Refer to products program

0.15

1.5

W

Positive voltage accuracy

Refer to recommended circuit

±1

±3

Negative voltage accuracy Refer to recommended circuit

±3

±5

Load regulation

From 10% to 100% load

±0.5

±1.5*

Line regulation

Input voltage from low to high

±0.2

±0.75

%

Temperature Drift (Vout)

Refer to recommended circuit

±0.03 %/°C

Output ripple & noise**

20MHz Bandwidth

35

100

mVp-p

Switching Frequency

100% load, input voltage range

550

kHz

*Dual output models unbalanced load:

±5%.

Power Converter section, application notes.

Operating Temp.(

)

C

Temperature Derating Graph

Safe Operating Area

0

50

100

150

200

250

Ti me (s ec.)

60

Max

(>220 C)

Sec

22 0 C

1 0

M ax

Se c

Pe a k . Te mp 24 0 C

Remark:

The curve applies only to the hot air reflow soldering

APPLICATION NOTE

RECOMMENDED CIRCUIT

1) Requirement On Output Load

In order to ensure the product operate efficiently and reliably, in addition to a max load

(namely full load), a minimum load is specified for this kind of DC/DC converter. Make sure

the specified range of input voltage is not exceeded, the minimum output load no less

than 10% load. If the actual load is less than the specified minimum load, the output ripple

may increase sharply while its efficiency and reliability will reduce greatly. If the actual

output power is very small, please add an appropriate resistor as extra loading, or contact

our company for other lower output power products.

2) Recommended Circuit

All the PWA_LT-1W5 & PWB_LT-1W5 series have been tested according to the following

recommended testing circuit before leaving factory. This series should be tested under load

(see Figure 1).

If you want to further decrease the input/output ripple, you can increase capacitance

properly or choose capacitors with low ESR. 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 maximum

capacitance of its filter capacitor sees (Table 1). General:

Cin: 10

μF~47μF

Cout: 10

μF/100mA

3) Input Current

When it is used in unregulated power supply, be sure that the fluctuating range of the

power supply and the rippled voltage do not exceed the m odule standard. Input current of

power supply should afford the flash startup current of this kind of DC/DC module (Figure 2)

General: Ip

≤1.6*Iin-max

4) No parallel connection or plug and play

DC

DC

Vin

GND

+Vo

0V

Cin

Vin

GND

+Vo

0V

Cin

DC

DC

-Vo

Single Output

Output External Capacitor Table (Table 1)

Single Vout

(VDC)

Cout

(

µF)

Dual Vout

(VDC)

Cout

(

µF)

3.3

2200

±5

680

9

680

±12

330

5

1000

±15

220

12

470

-

-

15

330

-