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

VRA_LD-20WR2 & VRB_LD-20W R2

2013.11.29-A/4

Page 9of9

Note:

1.Min. load shouldn't be less than 5%, otherwise ripple maybe increased dramatically, If the product operates under min. load, it may not be

guaranteed to meet all specification listed. Operation under minimum load will not damage the converter.

2.Recommended Dual output models unbalanced load:≤

±5%, If the product operates>±5%, it may not be guaranteed to meet all specification

Listed, please contact our technical person for more detail.

3.Max. Capacitive Load is tested at nominal input voltage and full load.

4.All specifications measured at Ta=25

°C, humidity<75%, nominal input voltage and rated output load unless otherwise specified.

5.In this datasheet, all the test methods of indications are based on our corporate standards.

6.All characteristics are for listed model, non-standard models may perform differently, please contact our technical person for more detail.

7.Contact us for your specific requirement.

8.Specifications of this product are subject to changes without prior notice.

MORNSUN Science & Technology Co.,Ltd.

Address: No. 5, Kehui St. 1, Kehui development center, Science Ave., Guangzhou Science City, Luogang district, Guangzhou,P.R.China.

Tel: 86-20-38601850

Fax:86-20-38601272

E-mail: info@mornsun.cn

Http://www.mornsun-power.com

(Table 1)

Vo

Parameter

3.3(VDC)

5(VDC)

12(VDC)

15(VDC)

24 (VDC)

R1(K

Ω)

4.801

2.883

10.971

14.497

24.872

R2(K

Ω)

2.863

2.864

2.864

2.864

2.863

R3(K

Ω)

15

10

17.8

17.8

20

Vref(V)

1.24

2.5

2.5

2.5

2.5

DESIGN CONSIDERATIONS

①Recommended circuit

All the VRA_LD-20WR2 & VRB_LD-20WR2 Series have been tested according to the following recommended testing circuit before leaving

factory (see Figure 3).

If you want to further decrease the input/output ripple, you can increase a capacitance properly or choose capacitors with low ESR, but the

greatest capacitance of its filter capacitor must less than the Max. Capacitive Load. The recommended capacitance of its filter capacitor sees

(Table 2).

DC

DC

Vin

GND

+Vo

0V

Cin

Cout

Vin

GND

+Vo

0V

Cin

Cout

DC

DC

-Vo

Cout

Dual Output

Single Output

(Figure 3)

EXTERNAL CAPACITOR TABLE (Table 2)

②It is not recommended to increase the output power capability by connecting two or more converters in parallel.The product is not hot-

swappable

Single

Vout

(VDC)

Cout

(

µF)

Cin

(

µF)

Dual

Vout

(VDC)

(

µF)

Cin

(

µF)

3.3/5

470

100

±5

220

100

12/15

220

±12/±15

100

24

100

±24

47