AC/DC Converter

LD20 Series

2014.02.12-B/0

Page 3 of 6

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

Product Characteristic Curve

0

-25

55

70

40

30

100

75

80

20

40

100

60

80

100

240

85

264

70

340

120

370

100

100~240VAC

120~340VDC

Input Voltage:

VAC

VDC

Ambient Temperature( )

℃

Temperature Derating Graph

Input Voltage V

()

Input Voltag e Deratin g Graph

Ambient temperature:25℃

Note: Input voltage should be derated based on temperature derating

when it is

.

85~100VAC/240~264VAC/100~120VDC/340~370VDC

20

3.3V,5 V O u tput

LD20-10B05

LD20-10B12

60

65

70

75

80

85

90

95

100

85

120

240

264

Input Voltage(V)

Efficiency Vs Input Voltage(Full Load)

LD20-10B05

LD20-10B12

60

65

70

75

80

85

90

10

30

50

70

100

Output Power Percentage(%)

Efficiency Vs Output Load(Vin=240VAC)

Design Reference

1. Typical application circuit

AC(L)

+Vo

-Vo

AC(L)

AC(N)

AC(N)

C1

C2

TVS

LOAD

FUSE

AC D C

MOV 1

NTC

Fig. 1: Typical application circuit

Model

C1

C2

TVS

LD20-10B03

1μF/50V

220μF/10V

SMBJ7.0A

LD20-10B05

220μF/10V

SMBJ7.0A

LD20-10B12

120μF/25V

SMBJ20A

LD20-10B15

120μF/25V

SMBJ20A

LD20-10B24

68μF/35V

SMBJ30A

Note:

Output filtering capacitor C2 is electrolytic capacitor, it is recommended to apply electrolytic capacitor with high frequency and low resistance. For

capacitance and current of capacitor please refer to manufacture’s datasheet. Capacitance withstand voltage derating should be 80% or above. C1 is

ceramic capacitor, which is used to filter high-frequency noise. TVS is a recommended component to protect post-circuits if converter fails.

2. EMC solution-recommended circuit

AC(N)

AC(L)

LCM

AC(N)

AC(L)

ACDC

MOV1

MOV2

CX

R1

CY2

CY1

GDT4

MOV3

+Vo

-Vo

FUSE

C1

C2

TVS

RL

LDM

Can use MORNSUN's FC-LX1D2

Fig 2: EMC application circuit with higher requirements

Fig 3: Recommended EMC circuit-PCB layout

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

ground ≥6mm