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Specifications subject to change without notice.

K78LXX-1000

A/3-2012

Page 2 of 3

TEMPERATURE DERATING GRAPH

EXTERNAL CAPACITOR TABLE

Operating Temp.(

)

C

（figure 1）

Part

Number

C1

(Ceramic

capacitor)

C2

(Ceramic

capacitor)

K78L03-1000

10

µF/50V

22

µF/6.3V

K78L05-1000

10

µF/50V

22

µF/10V

K78L09-1000

10

µF/50V

10

µF/16V

K78L12-1000

10

µF/50V

10

µF/25V

TYPICAL APPLICATION CIRCUIT

+Vin

GND

GND

K78LXX-1000

1

2

3

+Vo ut

C1

C2

(figure 2)

1. C1 and C2 are required and should be fitted close to the converter pins.

2. The capacitance of C1, C2 sees external capacitor table, it can be increased properly if required, and tantalum or low ESR electrolytic

capacitors may also suffice.

3. No parallel connection or plug and play.

TEST CONFIGURATIONS (TA=25

°C)

1

Efficiency and Output Voltage Ripple Test

Scope

C e ra mic

3

+Vin

GND

+Vo ut

C2

C1

2 5 .4 mm

1

D C/DC

C onverter

2

2 5 .4 mm

12 .7 mm

1F

μ

1 0F

μ

Ta n ta lum

Copp er strip

Copp er strip

(figure 3)

2

Start-up and Load Transient Response Test

3

+Vin

GND

+ V out

C2

C1

50 .8 mm

1

DC/DC

Converter

2

Scope

Copper strip

Copper strip

(figure 4)

OUTPUT RIPPLE REDUCTION

3

+Vin

GND

+Vout

1

DC/DC

Converter

C1

2 2F

μ

2

C2

L

(figure 5)

To reduce output ripple, it is recommended to add a LC filter in output port.