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

Specifications subject to change without notice.

WRA_(M)P-3W & WRB_(M)P-3W

B/0-2012

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

85

pF

COMMON SPECIFICATIONS

Item

Test Conditions

Min.

Typ.

Max.

Units

Storage humidity

95

%

Operating temperature

-40

85

Storage temperature

-55

125

Temp. rise at full load

15

Lead temperature

1.5mm from case for 10 seconds

300

°C

No-load power

0.2

W

Cooling

Free Air Convection

Short Circuit Protection

Continuous, Automatic Recovery

Case Material

P: Plastic (UL94-V0)

MP: Stainless steel

MTBF

1000

K hours

Weight

14

g

Operating Temp.(

)

C

100

OUTPUT SPECIFICATIONS

RECOMMENDED CIRCUIT

Item

Test Conditions

Min.

Typ.

Max.

Units

Output power

0.3

3

W

Positive voltage accuracy

Refer To Recommended Circuit

±1

±3

Negative voltage accuracy Refer To Recommended Circuit

±3

±5

10% to 100% load WRB_(M)P-3W

±0.5

±0.75

Load regulation

10% to 100% load WRA_(M)P-3W*

±0.5

±1.0

Line regulation

Input voltage from low to high

±0.2

±0.5

%

Temperature drift(Vout)

Refer to recommended circuit

±0.03

%/

°C

Noise & Ripple**

20MHz Bandwidth

50

100

mVp-p

Switching Frequency

100% load, input voltage range

300

KHz

*

Dual output models unbalanced load:

±5%.

** Test ripple and noise by

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

Converter section, application notes.

APPLICATION NOTE

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 WRA_(M)P-3W & WRB_(M)P-3W Series have been tested according to the following

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

Never be tested under no 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 should not be too high, or may

cause start-up problem. If you want to use the products in high EMI, please choose our metal

packaged products (WRA_MP-3W/WRB_MP-3W). For every channel of output, provided the

safe and reliable operation is ensured, the greatest capacitance of its filter capacitor sees

(Table 1). General:

Cin:

5V&12V

100

μF

24V&48V

10

μF~47μF

Cout: 10

μF/100mA

3) Input current

While using unstable power source, please ensure the output voltage and ripple voltage do

not excced indexes of the converter. The preceding power source must be able to provide for

converter sufficient starting current Ip (Figure 2).

General:

Ip

≤1.4*Iin-max

4) No parallel connection or plug and play

DC

DC

Vin

G ND

+Vo

0V

Cin

Cout

Vin

G ND

+Vo

0V

Cin

Cout

DC

DC

- Vo

Cout

S ing le O u tp ut

(Figure 1)

Input Voltage (V)

Input Voltage

Range

Ip

(Figure 2)

External Capacitor Table (Table 1)

Single Vout

(VDC)

Cout

(

μF)

Dual Vout

(VDC)

Cout

(

μF)

3.3

2200

±5

680

5

1000

±9

470

9

680

±12

330

12

470

±15

220

15

330

±24

100

24

220

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