(b)

Fuse

Input

+Vin

-Vin

Schottky Barrier

Diode

Fig.2.2 Connecting a Reverse Voltage Protection Circuit

¡

Basically, SU/SUC/SUT series do not need any external capaci-

tor. However, if you want to further reduce the output ripple noise,

connect an electrolytic capacitor or a ceramic capacitor Co to the

output pin terminal as shown below.

Co

Co

Co

COM

Load

Load

Load

SUW/SUCW

SUS/SUCS

+Vout

-Vout

-Vout

+Vout

Fig.2.3 Connecting Example of an External Capacitor to the Output Side

Table 2.2 Recommended Capacitance of External Capacitor on the Output Side [ F]

Model

Output Voltage(V)

SU/SUC1R5 SU/SUC3/SUT3 SU/SUC6/SUT6 SU/SUC10/SUT10

3.3

1 - 100

1 - 220

1 - 220

1 - 220

5

1 - 100

1 - 220

1 - 220

1 - 220

12

1 - 100

1 - 100

1 - 100

1 - 100

15

1 - 100

1 - 100

1 - 100

1 - 100

*

If you use a ceramic capacitor, keep the capacitance within the

range between about 0.1 to 10 F.

*

Please adjust the capacitance in light of the effect you want to

achieve.

*

If you need to use an external capacitor whose capacitance ex-

ceeds the range provided in Table 2.2, please contact us.

¡

If the distance between the output and the load is long and there-

fore the noise is created on the load side, connect a capacitor

externally to the load as shown below.

Load

Input

+Vin

-Vin

+Vout

-Vout

3 Series/Parallel

Operation

3.1 Series Operation

¡

You can use the power supplies in series operation by wiring as

shown below. In the case of (a) below, the output current should

be lower than the rated current of a power supply with the lowest

rated current among power supplies that are serially connected.

Please make sure that no current exceeding the rated current

flows into a power supply.

(a)

D1 - D4 : Use a schottky barrier diode

with low forward voltage.

D1, D2 : Use a schottky barrier diode

with low forward voltage.

D2

D1

+

-

-

+

Power

Supply

Power

Supply

12V or more

Power

Supply

Power

Supply

D4

D2

+

-

-

+

5V or less

D1

D3

(b)

Power

Supply

Power

Supply

+

-

-

+

Fig.3.1 Series Operation

3.2 Redundancy Operation

¡

You can use the power supplies in redundancy operation by wiring

as shown below.

Power

Supply

Power

Supply

-

+

+

-

Fig.3.2 Redundancy Operation

¡

Even a slight difference in output voltage can affect the balance

current of a power supply.

DC-DC Converters PCB Mount Type

Instruction Manual

SU.SUC/SUT-54

June 26, 2020