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CUI Inc

│ SERIES: PDM1-S │ DESCRIPTION: DC-DC CONVERTER

date 07/01/2021

│ page 6 of 7

1. Output load requirement

To ensure this module can operate efficiently and reliably, the minimum output load may not be less than 10% of the full load during

operation. If the actual output power is low, connect a resistor at the output end in parallel to increase the load.

2. Recommended circuit

If you want to further decrease the input/output ripple, you can increase the capacitance accordingly or choose capacitors with low

ESR (see Figure 2 & Table 2). However, the capacitance of the output filter capacitor must be appropriate. If the capacitance is too

high, a startup problem might arise. For every channel of the output, to ensure safe and reliable operation, the maximum capacitance

must be less than the maximum capacitive load (see Table 3).

APPLICATION NOTES

Note:

1. Operation under minimum load will not damage the converter; however, they may not meet all specifications listed.

2. Max. capacitive load tested at input voltage range and full load.

3. All specifications measured at: Ta=25°C, humidity<75%, nominal input voltage and rated output load, unless otherwise specified.

Single Vout

(Vdc)

Max. Capacitive Load

(μF)

Dual Vout

(Vdc)

(μF)

3.3

220

3.3

100

5

220

5

100

9

220

9

100

12

220

12

100

15

220

15

100

24

220

24

100

Figure 2

Table 2

Vin

(Vdc)

Cin

(µF)

Single Vo

(Vdc)

Cout

(µF)

Dual Vo

(Vdc)

Cout

(µF)

3.3

4.7

3.3

10

±3.3

4.7

5

4.7

5

10

±5

4.7

9

2.2

9

2.2

±9

1

12

2.2

12

2.2

±12

1

15

2.2

15

1

±15

0.47

24

1

24

1

±24

0.47

Note:

It’s not recommended to connect any external capacitors in

applications with less than 0.5 watt output.

Table 3

Note:

1. For each output.

Single output

Dual output

Additional Resources: Product Page | 3D Model | PCB Footprint