NCS6 MURATA-PS [Murata Power Solutions Inc.], NCS6 Datasheet - Page 2

• Manufacturer Part Number: NCS6
• Description: Isolated 6W 4:1 Input Single Output DC/DC Converters
• Manufacturer: MURATA-PS [Murata Power Solutions Inc.]

GENERAL CHARACTERISTICS
Parameter
Switching frequency
TEMPERATURE CHARACTERISTICS
Parameter
Operation
Storage
Case temperature rise above ambient
Thermal shutdown
APPLICATION NOTES
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 specifi ed time, across a component designed to provide electrical isolation, to verify the integrity of that isolation.
Murata Power Solutions NCS6 series of DC/DC converters are all 100% production tested at their stated isolation voltage. This is 1.5kVDC for 1 second.
A question commonly asked is, “What is the continuous voltage that can be applied across the part in normal operation?”
For a part holding no specifi c agency approvals, such as the NCS6 series, both input and output should normally be maintained within SELV limits i.e. less than 42.4V peak, or
60VDC. The isolation test voltage represents a measure of immunity to transient voltages and the part should never be used as an element of a safety isolation system. The part
could be expected to function correctly with several hundred volts offset applied continuously across the isolation barrier; but then the circuitry on both sides of the barrier must
be regarded as operating at an unsafe voltage and further isolation/insulation systems must form a barrier between these circuits and any user-accessible circuitry according to
safety standard requirements.
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. The NCS6 series has an ER ferrite core, with no additional insulation between primary and secondary windings of enameled wire. While parts can be
expected to withstand several times the stated test voltage, the isolation capability does depend on the wire insulation. Any material, including this enamel (typically polyurethane)
is susceptible to eventual chemical degradation when subject to very high applied voltages thus implying that the number of tests should be strictly limited. We therefore strongly
advise against repeated high voltage isolation testing, but if it is absolutely required, that the voltage be reduced by 20% from specifi ed test voltage.
This consideration equally applies to agency recognized parts rated for better than functional isolation where the wire enamel insulation is always supplemented by a further
insulation system of physical spacing or barriers.
Output Capacitors
The NCS6 series does not require output capacitors to meet datasheet specifi cation. To meet datasheet specifi cation, output capacitance should not exceed:
Minimum Load
The minimum load to meet full datasheet specifi cation is 10% of the full rated load across the specifi ed input voltage range.
Between 0% and 10% output loading, the output voltage will remain within data sheet specifi cation however, output ripple and noise will increase but will still be below
50mV p-p.
www.murata-ps.com
Output Voltage (V)
3.3
5
12
15
1
Output Capacitance (μF)
470
470
220
220
Conditions
100% Load, Nom V
Case Temperature
Conditions
IN
, Still Air,
Isolated 6W 4:1 Input Single Output DC/DC Converters
Technical enquiries email: [e-mail], tel: [phone]
3.3V
5V
12V
15V
2009-09-21 KDC_NCS6C.B01 Page 2 of 6
Min.
Min.
-40
-50
NCS6 Series
Typ.
Typ.
180
110
32
32
28
26
Max.
Max.
125
85
Units
Units
kHz
°C