cui.com

date

08/09/2013 │ page 5 of 6

CUI Inc

│ SERIES: PBK-5 │ DESCRIPTION: AC-DC POWER SUPPLY

EMC RECOMMENDED CIRCUIT

TYPICAL APPLICATION CIRCUIT

C2

C3

1

+Vo

-Vo

TVS

RL

12

14

L

N

C1

+

5

+

3

MOV

7

AC-DC

CY0

L1

+

C4

CX1

Recommended External Circuit Components

MOV

561KD14

R1, R2

2Ω/3W winding resistor

R3

1MΩ/2W

CY1, CY2,

CY3, CY4

1nF/400Vac

CX

0.22μF/275Vac

LCM

10mH-30mH

FUSE

1A/250V

Figure 2

Table 2

Figure 3

Table 3

N

L

L

PE

MOV

R2

R1

LCM

R3

CX

CY3

CY4

AC-DC

CY1

CY2

C1

+

5

FUSE

14

CY0

12

7

N

-Vo

+Vo

L1

+

+

OUT PUT

C2

C3

Recommended external circuit components

V

OUT

(Vdc)

C1

C2

C3

C4

L1

CY0

FUSE

TVS

NTC

MOV

3.3

33μF/400V

470μF/16V

150μF/35V 100nF/50V

0.47uH

1nF/400Vac

1A/250V

SMBJ7.0A

5D-9

561KD14

533μF/400V

470μF/16V

150μF/35V 100nF/50V

0.47uH

1nF/400Vac

1A/250V

SMBJ7.0A

5D-9

561KD14

933μF/400V

330μF/35V

150μF/35V 100nF/50V

1uH

1nF/400Vac

1A/250V

SMBJ12A

5D-9

561KD14

12

33μF/400V

330μF/35V

150μF/35V 100nF/50V

1uH

1nF/400Vac

1A/250V

SMBJ20A

5D-9

561KD14

15

33μF/400V

330μF/35V

150μF/35V 100nF/50V

1uH

1nF/400Vac

1A/250V

SMBJ20A

5D-9

561KD14

24

33μF/400V

100μF/35V

47μF/35V

100nF/50V

4.7uH

1nF/400Vac

1A/250V

SMBJ30A

5D-9

561KD14

Notes:

1. C1 is a required electrolytic capacitor for AC input. We recommend a 33μF/400V capacitor for C1.

2. C1 is a required EMC capacitor for DC input. We recommend a 33μF/400V for C1. When input voltage is above 370VDC, and the value of C1 should be 33μF/450V. If EMC

performance is not required, C1 could be 10μF/400V.

3. Output filtering capacitors C2 and C3 are electrolytic capacitors and are required for both AC or DC inputs. Together they make a pi capacitor circuit with L1. We

recommend using high frequency and low impedance electrolytic capacitors. Voltage derating of capacitors should be 80% or above. C4 is ceramic capacitor, it is used to

filter high frequency noise. For current of L1 please refer to manufacture’s datasheet. Voltage derating of capacitors should be 80% or above.TVS is a recommended

component to protect post-circuits if converter fails.

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

Note:

1. Also refer to Table 2.