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CUI Inc

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

date 03/20/2013

│ page 4 of 6

FU

EUT

1

2

3

LDM2

C0

TVS

LDM1

MOV

SE

C3

Vin

GND

+

C2

Vout

GND

C1

(a)

(b)

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

10D560

LDM1

82μH

TVS

SMCJ36A

C0

120μF/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 RECCOMENDED 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