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WRF_MT-3W

2013.06.26-A/1

Page 3 of 6

EMC RECOMMENDED CIRCUIT

L D M2

②

C0

TVS

L D M1

MOV

FUSE

①

C1

+

Vin

G ND

+Vo

0V

EUT

L O AD

C2

CY

C trl

Cd

D1

R

③

C trl

Vin

G ND

(Figure 1)

Recommended external circuit param eters:

Model

Vin：12V

Vin：24V

Vin：48V

FUSE

Choose according to actual input current

MOV

--

S14K35

S14K60

LDM1

--

56

μH

56

μH

TVS

SMCJ28A

SMCJ48A

SMCJ90A

C0

680uF/50V

330

μF/50V

330

μF/100V

C1

4.7

μF/50V

4.7

μF/100V

LDM2

12

μH

C2

4.7

μF/50V

4.7

μF/100V

CY

1nF/2KV

D1

RB160M-60/1A

R

Follows:

300

-

0

.

1

-

-

C

D

C

I

V

V

R =

Cd

47nF/100V

Note:

1. In Figure 1,part① is EMS recommended external circuit, part② is EMI recommended external circuit. Choose according to requirements;

2. If there is no recommended parameters, the model no require the external component;

3.

5-10mA, the external circuit of Ctrl is as shown in figure1-③.

EMC RECOMMENDED CIRCUIT PCB LAYOUT

(Figure 2)

Note: The space between input and output GND (CY) must

≥2mm.

EMC MODULE APPLICATION CIRCUIT

E UT

GND

C trl

-Vo

+Vo

-Vin

+Vin

FT- A /BX 1D

Load

0V

+Vo

V in

Cd

D1

R

C t rl

C

+

-Vin

+V in

FU SE

L DM

C1

FT-A/BX1D is MORNSUN

’s EFT suppresser

For nominal voltage <48V,C

≥330μF/50V

For nominal voltage =48V,C

≥330μF/100V

LDM=12uH,C1=1nF/2000V

(Figure 3)