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CUI Inc

│ SERIES: PYB30 │ DESCRIPTION: DC-DC CONVERTER

date

08/15/2013 │ page 5 of 7

Recommended external circuit components

Vin (Vdc)

24

48

FUSE

Choose according to input current

MOV

10D560K

10D101K

LDM

56μH56μH

TVS

SMCJ48A

SMCJ90A

C0

120μF/50V

120μF/100V

C1

4.7μF/50V

2.2μF/100V

LCM

2.2mH

2.2mH

C2

4.7μF/50V

2.2μF/100V

1nF/2KV

1nF/2KV

1nF/2KV

1nF/2KV

EMC RECOMMENDED CIRCUIT

DERATING CURVES

Vi n

GN D

+Vo

-Vo

EUT

LO AD

C2

LC M

C0

TVS

LD M

MO V

FU SE

C1

C4

Vi n

GN D

C3

LO AD

0V

Vi n

GN D

+Vo

0V

EUT

LO AD

C2

LCM

C0

TVS

LD M

MO V

FU SE

C1

C4

Vi n

GN D

C3

Vi n

GN D

+Vo 2

-Vo 2

EUT

LO AD

C2

LC M

C0

TVS

LD M

MO V

FU SE

C1

C4

Vi n

GN D

C3

LO AD

0V

+Vo 1

LO AD

Single Output

Dual Output

Triple Output

Figure 1

Figure 2

Table 1

Table 2

TEST CONFIGURATION

DC

Cin

Lin

DC

Load

Oscilloscope

Current

Probe

Note:

Input reflected-ripple current is measured with an inductor Lin and Capacitor Cin to simulate source impedance.

External components

Lin

4.7μH

Cin

220μF, ESR < 1.0Ω

at 100 KHz

Temperature Derating Curve

100

80

60

40

20

Ambient Temperature (°C)

-40

-20

0

20

40

85

70

60

Safe operating area

Without heatsink

With heatsink

Note:

*2nF/2KV capacitors for triple output, 48V input models.