AC/DC Converter

LH20(25) Series

2015.08.24-B/3

Page 4 of 8

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Design Reference

1. Typical application circuit

AC(L)

+Vo

-Vo

AC(L)

AC(N)

AC(N)

C 1 C 2

TV S

RL

FUSE

AC DC

MO V

NTC

Fig. 1: LH20(25)-10B series (Single Output)Typical application circuit

FUSE

+Vo

AC(L)

AC(N)

-Vo

AC(N) C om

C 4

C 2

C 1

C 3

RL

TV S1

TV S2

RL

NTC

AC(L)

AC DC

MO V

Fig. 2: LH20-10A series (Dual Output) typical application circuit

+

-

C1

C4

C3

C2

-

Vo1

Vo2

TVS1

TVS2

RL

RL

FUSE

AC(L)

AC(N)

AC(N)

NTC

+

AC(L)

ACDC

M OV

Fig. 3: LH20-10D series (Isolate Twin Output) typical application circuit

+

C1

C4

C3

C2

-

Vo1

Com

TVS1

TVS2

RL

RL

FUSE

AC(L)

AC(N)

AC(N)

AC(L)

ACDC

MO V

+Vo2

C6

C5

TVS3

RL

-Vo2

NTC

Fig. 4: LH20-10C series (Triple Output) typical application circuit

Model

C2(µF)

C4(µF)

C6(µF)

TVS1

TVS2

TVS3

LH20-10B03

330

SMBJ7.0A

LH20-10B05

330

SMBJ7.0A

LH20-10B09

220

SMBJ12A

LH20-10B12

220

SMBJ20A

LH20-10B15

220

SMBJ20A

LH20-10B24

220

SMBJ30A

LH20-10A05

470

470

SMBJ7.0A

SMBJ7.0A

LH20-10A12

120

120

SMBJ20A

SMBJ20A

LH20-10A15

68

68

SMBJ20A

SMBJ20A

LH20-10C0505-05

330

120

120

SMBJ7.0A

SMBJ7.0A

SMBJ7.0A

LH20-10C0512-04

330

120

120

SMBJ7.0A

SMBJ20A

SMBJ20A

LH20-10C0515-03

330

120

120

SMBJ7.0A

SMBJ20A

SMBJ20A

LH20-10C0524-02

330

47

47

SMBJ7.0A

SMBJ30A

SMBJ30A

LH20-10D0512-06

330

220

SMBJ7.0A

SMBJ20A

LH20-10D0515-05

330

220

SMBJ7.0A

SMBJ20A

LH20-10D0524-03

330

120

SMBJ7.0A

SMBJ30A

LH25-10B03

330

SMBJ7.0A

LH25-10B05

330

SMBJ7.0A

LH25-10B09

330

SMBJ12A

LH25-10B12

330

SMBJ20A

LH25-10B15

330

SMBJ20A

LH25-10B24

120

SMBJ30A

LH25-10B48

68

SMBJ64A

Note:

Note: Output filtering capacitors C2, C4, C6 are electrolytic capacitors, it is recommended to use high frequency and low impedance electrolytic capacitor.

For capacitance and current of capacitor please refer to manufacture’s datasheet. Capacitor withstand voltage derating should be 80% or above. C1,C3, C5

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

NTC is recommended to use 5D-9. External input MOV model is recommended to use S14K300.