cui.com

date

03/25/2014 │ page 6 of 7

CUI Inc

│ SERIES: PBK-1 │ DESCRIPTION: AC-DC POWER SUPPLY

EMC RECOMMENDED CIRCUIT

Recommended External Circuit Components

MOV2

S10K300

CY1, CY2

1nF/400Vac

CX

0.1μF/275Vac

LCM

3.5mH

LDM

5mH

FUSE

1A/250V, slow blow

Figure 3

Table 3

AC ( N )

AC( L)

AC(L )

MOV 2

LC M

CX

CY 1

CY 2

AC-DC

C1

+

5

FU SE

12

CY 0

10

7

AC ( N )

-V o

+V o

L1

+

+

C2

C3

TVS

R L

C4

LD M

Notes:

1. C1 and C3 are electrolytic capacitors. They are required for both AC input and DC input.

2. For AC input, C1 is used as a filter capacitor. The recommended C1 value is 10 μF/400 V.

3. For DC input, C1 is used as an EMC filter capacitor. The recommended C1 value is 10μF/400V. When the input voltage is above 370VDC, we recommend a 10μF/450V capacitor.

4. C2 and C3 are output filer capacitors, we recommend high frequency and low impedance electrolytic capacitors. For capacitance and rated ripple current of capacitors refer to

the datasheets provided by the manufacturers, voltage derating of capacitors should be 80% or above.

5. C4 is a ceramic capacitor which is used to filter high frequency noise. C2, C3 and L1 form a pi-type filter circuit. For current of L1 and L2 refer to the datasheets provided by

the manufacturers, current derating should be 80% or above. TVS is a recommended component to protect post-circuits (if converter fails). We recommend using a 5D-9

external input NTC.

6. For standard EMC requirements, please refer to figure 2. If a higher EMC is required, please refer to figure 3.

7. All specifications measured at Ta=25C, humidity <75%, 115 Vac & 230 Vac input voltage, and rated output load, unless otherwise specified.

Note:

Also refer to Table 2.

TYPICAL APPLICATION CIRCUIT

1

+Vo

-Vo

10

12

AC( L)

AC(N)

C1

+

5

3

MOV1

7

AC-DC

C2

C3 TVS

RL

+

L1

(1)

+

C4

L2

CY0

Note: (1) is Pi filter circuit.

Figure 2

Table 2

Recommended External Circuit Components

V

OUT

(Vdc)

L2

C4

CY0

TVS

NTC

MOV1

510μF/400V 1mH 150μF/35V 2.2μH68μF/35V 0.1μF/50V 1nF/400Vac

1A/250V

SMBJ7.0A

5D-9

S14K350

910μF/400V 1mH 150μF/35V 2.2μH68μF/35V 0.1μF/50V 1nF/400Vac

1A/250V

SMBJ12A

5D-9

S14K350

12

10μF/400V 1mH 100μF/35V 2.2μH68μF/35V 0.1μF/50V 1nF/400Vac

1A/250V

SMBJ20A

5D-9

S14K350

15

10μF/400V 1mH 100μF/35V 2.2μH68μF/35V 0.1μF/50V 1nF/400Vac

1A/250V

SMBJ20A

5D-9

S14K350

24

10μF/400V 1mH 100μF/35V 2.2μH68μF/35V 0.1μF/50V 1nF/400Vac

1A/250V

SMBJ30A

5D-9

S14K350

Note:

1. Required components.

For more information, please visit the product page.