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NDY Series
Isolated 3W Wide Input DC/DC Converters
OUTPUT CHARACTERISTICS
Parameter
Voltage set point accuracy
Line regulation
Load regulation
Ripple 1
Noise 1
Conditions
With external input/output capacitors
Low line to high line, 3.3V output with external input/output capacitors
Low line to high line, all other outputs with external input/output capacitors
25% load to 100% load, 3.3V output with external input/output capacitors
25% load to 100% load, all other outputs with external input/output capacitors
BW = 20Hz to 300kHz, 3.3V output with external input/output capacitors
BW = 20Hz to 300kHz, all other outputs with external input/output capacitors
BW = DC to 100MHz, 3.3V output with external input/output capacitors
BW = DC to 20MHz, all other outputs with external input/output capacitors
Min.
Typ.
±1
0.05
0.05
0.6
0.2
80
5
50
Max.
±5
0.25
0.5
1.0
0.5
120
10
180
100
Units
%
%
%
%
%
mV rms
mV p-p
GENERAL CHARACTERISTICS
Parameter Conditions
100% load V IN nominal 3.3V output
Min.
160
Typ.
Max.
220
Units
Switching frequency
25% load V IN nominal 3.3V output
100% load V IN nominal, all other outputs
25% load V IN nominal, all other outputs
290
80
290
560
220
560
kHz
TEMPERATURE CHARACTERISTICS
Parameter
Operation
Storage
Conditions
Ambient temperature
Min.
-40
-50
Typ.
Max.
85
130
Units
oC
Cooling
ISOLATION CHARACTERISTICS
Free air convection
Parameter
Isolation test voltage
Resistance
Conditions
Flash tested for 1 second
Viso=500VDC
Min.
1000
1
Typ.
Max.
Units
VDC
GΩ
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 speci?ed time, across a component designed to provide electrical isolation, to verify the integrity of that isolation.
Murata Power Solutions NDY series of DC/DC converters are all 100% production tested at their stated isolation voltage. This is 1kVDC for 1 second.
A question commonly asked is, “What is the continuous voltage that can be applied across the part in normal operation?”
The NDY series has been recognized by Underwriters Laboratory for functional isolation. 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 NDY series has an EI 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 speci?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.
SAFETY APPROVAL
The NDY series has been recognised by Underwriters Laboratory (UL) to UL 60950 for functional insulation for a maximum case temperature limit of 130oC (case temperature
measured on the face opposite the pins). File number E151252 applies.
Note: This series gained UL 60950 recognition for products manufactured on or after datecode G1123, any NDY parts manufactured before this date code should not be considered
UL 60950 recognized. Any NDY that is UL recognized will be printed with the UL logo.
1. For lower ripple refer to circuit for reduced ripple.
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