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Specifications subject to change without notice.

LD12-20BXX

A/2-2012

Page3 of 5

TEMPERATURE VS LOAD

INPUT VOLTAGE VS LOAD

Load(%)

0

-40

55

70

50

40

100

60

80

Load(%)

Input voltage(Vac)

20

40

100

60

80

100

240

85

264

70

3 40

1 20

370

20

40

100

60

80

100

70

Loa d( %)

In pu t vo ltag e( Vd c)

TYPICAL APPLICATIONS

L

+Vo

-Vo

L

N

N

+

N TC

F USE

C1

C2

T VS

RL

Figure 1: LD12-20BXX EMC application circuit

L

N

+ Vo

- Vo

AC -DC

L

N

+ Vo

-Vo

Figure 2: Note: This application is not supported for this series.

Can use MORNSUN

’s FC-L01D2

OU TPUT

可使用我司模块FC-L01D2

N

L

N

L

L CM

MO V1

MO V2

MO V3

R2

R1

R3

CX

MO V4

MO V5

CY1

CY2

GD T4

ACDC

FUSE

Figure 3: LD12 series Recommended circuit for application require higher EMC standard

(external circuit output same as above)

Figure 4:EMC application circuit PCB layout

Safety and recommend wiring: linewidth A

≥3mm,C≥9mm

EXTERNAL CIRCUIT PARAMETERS

Model

C1

C2

TVS

LD12-20B03

1

µF /50V

220

µF /10V

SMBJ7.0A

LD12-20B05

1

µF /50V

220

µF /10V

SMBJ7.0A

LD12-20B12

1

µF /50V

120

µF /25V

SMBJ20A

LD12-20B15

1

µF /50V

120

µF /25V

SMBJ20A

LD12-20B24

1

µF /50V

68

µF/50V

SMBJ30A

Note:

1. C1 is ceramic capacitor, it is used to filter high frequency noise. Output filtering capacitors C2 is electrolytic capacitors, It is recommended to use high frequency

and low impedance electrolytic capacitors. For capacitance and current of capacitor please refer to manufacture

’s datasheet. Voltage derating of capacitor should

be 80% or above. TVS is a recommended component to protect post-circuits (if converter fails). External input NTC model is recommended to use 5D-9.

2. For standard EMC requirement, please refer to figure 1, if higher EMC requirement, please refer to figure 3 .

MOV1：561KD20；

MOV2、MOV3：561KD14；

MOV4、MOV5：561KD07；

GDT4：B5G3600；

CX：0.15

µF/300VAC；

CY1、CY2：222M/400VAC；

R1、R2：2

Ω/3W wirewound；

R3：1M

Ω/2W；

LCM：10mH-30mH；

FC-L01D2：4KV/6KV Surge protector。

3. FUSE：LD12 is recommended to use 3.15A/250V.