AC/DC Converter

LH40 Series

2015.03.02-A/3

Page 5 of 7

MORNSUN Guangzhou Science & Technology Co., Ltd. reserves the copyright and right of final interpretation

EMC solution-recommended circuit PCB layout

Fig 5

Suggestions for safety regulation and wiring width: wire width ≥3mm, distance between wires ≥6mm, and distance between wire and

ground ≥6mm

Element model

Recommended value

MOV1

S14K350

MOV2, MOV3

S07K350

CX

0.15μF/300VAC

CY1

2.2nF/400VAC

CY2

2.2nF /400VAC

R1

1MΩ/2W

LCM

2.2 mH, recommended to use MORNSUN’s FL2D-10-222;

NTC

5D-14

FUSE

3.15A/250V, slow fusing, necessary

3. Application of Trim and calculation of Trim resistance

0V

Trim

+Vot

0V

Trim

+Vot

Trim up

Trim down

Applied circuits of Trim (Part in broken line is the interior of models)

Calculation formula of Trim resistance:

up:

a=

Vref

Vot-Vref

R=

T

R-a

2

down:

a=

Vref

Vot-Vref

R=

T

R-a

1

parameter, with no real meaning.

Vout

R1(KΩ)R2(KΩ)R3(KΩ)

Vref(V)

Vot(V)

3.3V

2

1.2

1

1.24

Output voltage

after regulation,

variation ≤ ±10%

5V

3.3

3.3

1

2.5

9V

4.7

1.8

1

2.5

12V

3.83

1

1

2.5

15V

4.99

1

1

2.5

24V

8.66

1

1

2.5

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