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CUI Inc

│ SERIES: P7805-S │ DESCRIPTION: NON-ISOLATED SWITCHING REGULATOR

date 02/19/2015

│ page 4 of 6

DC/DC

Vin

LDM2

C0

LDM1

MOV

FUSE

C3

V in

GND

+

+Vo

GND

LOAD

C2

C1

DERATING CURVES

100

80

60

40

20

Operating Temperature (°C)

-40-20

0204060

85

100

Safe operating area

71

Recommended external circuit components

FUSE

choose according to practical input

current

MOV

S10K35

LDM1

82μH

LDM2

12μH

C0

680μF/50V

C3

4.7μF/50V

Temperature Derating Curve

Figure 1

TEST CONFIGURATION

Note: To reduce ripple, it is recommended to add a LC filter in output port. (L: Recommended parameter 10μH ~ 47 μH)

EMC RECOMMENDED CIRCUIT

Effeciency and Output Voltage Ripple Test

Start-up and Load Transient Response Test

Scope

Ceramic

3(2)

+Vin

GND

Vout

C2

C1

25.4mm

1

DC/DC

Converter

2(3)

25.4mm

12.7mm

1F 10 F

Tantalum

Copper strip

Copper strip

3(2)

+Vin

GND

Vout

C2

C1

50.8 mm

1

DC/DC

Converter

2

Scope

Copper strip

Copper strip

(3)

OUTPUT RIPPLE REDUCTION

3(2)

+Vin

GND

Vout

1

DC/DC

Converter

C1

22 F

2(3)

C2

L

Note: See External Capacitor Table on page 5 for C1 & C2 values.

For more information, please visit the product page.