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CUI Inc

│ SERIES: PQA30-D │ DESCRIPTION: DC-DC CONVERTER

date 07/08/2014

│ page 5 of 7

Output Voltage ≤ 5V

Recommended external circuit components

Vin (Vdc)

24

48

FUSE

choose according to input current

MOV

S14K35

S14K60

LDM1

56µH

56µH

TVS

SMCJ48A

SMCJ90A

C0

330µF/50V

330µF/100V

C1, C2

4.7µF/50V

2.2µF/100V

LCM1

1mH

1mH

CY1, CY2

1nF/2kV

1nF/2kV

EMC RECOMMENDED CIRCUIT

DERATING CURVES

100

80

60

40

20

Ambient Temperature (°C)

-40-20

02040

85 100

Safe operating area

60

50

Without heatsink

With heatsink

100

80

60

40

20

Ambient Temperature (°C)

-40-20

02040

100

Safe operating area

55 65

85

Without heatsink

With heatsink

Output Voltage > 5V

Figure 1

Table 1

VIN

GN D

+Vo

0V

EUT

LO AD

C2

LCM1

C0

TVS

LDM1

MO V

FU SE

C1

Vi n

GND

CY1

CY2

(a)

(b)

TEST CONFIGURATION

DC

Cin

Lin

DC

Load

Oscilloscope

Current

Probe

Lin(4.7µH)

Cin(220µF, ESR< 1.0Ω at 100KHz)

Note:

1. 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

Figure 2

Table 2

For more information, please visit the product page.