NCM6 Series

Isolated 6W Wide Input Single & Dual Output DC/DC Converters

KDC_NCM6C.B01

Page 4 of 19

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APPLICATION NOTES

Output Capacitance and start-up times

The NCM6 series does not require output capacitors to meet datasheet specification. To meet datasheet specification, output capacitance should not exceed:

Part No.

Maximun Load Capacitance (per output)

Start-up times

μF

ms

NCM6D0505C

220

6

NCM6D0512C

100

12

NCM6D0515C

100

18

NCM6S0503C

470

4

NCM6S0505C

220

7

NCM6S0512C

100

12

NCM6S0515C

100

17

NCM6D1205C

220

5

NCM6D1212C

100

12

NCM6D1215C

100

17

NCM6S1203C

470

2

NCM6S1205C

220

6

NCM6S1212C

100

14

NCM6S1215C

100

17

NCM6D4805C

220

10

NCM6D4812C

100

40

NCM6D4815C

100

60

NCM6S4803C

470

2

NCM6S4805C

220

5

NCM6S4812C

100

15

NCM6S4815C

100

20

Control Pin

This provides an OFF function which puts the converter into a low power mode when >3V is applied to the pin. When the control pin is left un-connected or less than 1V the

converter is ON

Minimum Load

The minimum load to meet full datasheet specification is 10% of the full rated load across the specified input voltage range.

Between 0% and 10% output loading, the output voltage will remain within data sheet specification however, output ripple and noise may increase but will still be below

150mV p-p.

TECHNICAL NOTES

ISOLATION VOLTAGE

‘Hi Pot Test’, ‘Flash Tested’, ‘Withstand Voltage’, ‘Proof Voltage’, ‘Dielectric Withstand Voltage’ & ‘Isolation Test Voltage’ are all terms that relate to the same thing, a test

voltage, applied for a specified time, across a component designed to provide electrical isolation, to verify the integrity of that isolation.

Murata Power Solutions NCM6 series of DC/DC converters are all 100% production tested at their stated isolation voltage. This is 5.2kVDC for 1 second.

A question commonly asked is, “What is the continuous voltage that can be applied across the part in normal operation?”

The NCM6 series has been recognized by Underwriters Laboratory to 250Vrms for Reinforced Insulation.

REPEATED HIGH-VOLTAGE ISOLATION TESTING

It is well known that repeated high-voltage isolation testing of a barrier component can actually degrade isolation capability, to a lesser or greater degree depending on

materials, construction and environment. We therefore strongly advise against repeated high voltage isolation testing, but if it is absolutely required, that the voltage be

reduced by 20% from specified test voltage.