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URC_D-30W

2013.05.31-A/2

Page 3 of 5

EMC RECOMMENDED CIRCUIT

Vin

G ND

+Vo2

-Vo2

EUT

LO AD

C2

L CM

②

C0

TVS

LDM

MOV

FU SE

①

C1

C4

Vin

G ND

C3

LO AD

0V

+Vo1

LO AD

(Figure 1)

Recommended external circuit parameters:

Model

URC24_D-30W

URC48_D-30W

FUSE

Choose according to practical input current

MOV

S10K35

S10K60

LDM

56

μH

TVS

SMCJ48A

SMCJ90A

C0

680

μF/50V

680

μF/100V

C1

1

μF /100V

LCM

1mH（0.1V 100KHz）15T core: TS7

T12*6*4

C2

2.2

μF /100V

C3

--

C4

1nF/2KV

Note: 1. In Figure 1,part①is EMS Recommended external circuit, part②is EMI recommended external circuit. Choose according to requirements.

2. If want to meet higher level of RE, add a common mode inductance after Lcm in figure 1: 1.5mH 20T core:A10 T12*6*4.

EMC RECOMMENDED CIRCUIT PCB LAYOUT

(Figure 2)

EMC TEST WAVEFORM(CLASS B TEST CIRCUIT)

URC240515D-30W

CE (Positive line)

URC240515D-30W

CE (Negative line)

URC240515D-30W

RE(Horizontal)

URC240515D-30W

RE(Vertical)