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NDH2412SC

P1-P3P4-P4
NDH Series
Isolated 3W Dual Output DC/DC Converters
KDC_NDH.C02 Page 1 of 4
www.murata-ps.com
www.murata-ps.com/suppor t
For full details go to
www.murata-ps.com/rohs
　
SELECTION GUIDE
Order Code
Input
Voltage
Rated Output
Voltage
Output Current
Input
Current
2
Efficiency
(MIN.)
Isolation
Capacitance
Min Load
3
Full Load
V (NOM.) V mA mA mA % pF
NDH2412SC 24 ±12 ±32 125 157 81 36
NDH2415SC 24 ±15 ±25 100 155 82 36
Obsolete
Recommended
Alternative
NDH4812SC 48 ±12 ±32 125 78 78 40 Contact Murata
NDH4815SC 48 ±15 ±25 100 78 78 40 Contact Murata
INPUT CHARACTERISTICS
Parameter Conditions MIN. TYP. MAX. Units
Voltage range
All NDH24 types 18 24 36
V
All NDH48 types 36 48 72
Reflected ripple current
All NDH24 types when 10μF at input 200 250
mA p-p
All NDH48 types when 10μF at input 105 150
Shutdown Power
V
IN Nominal 24XX 8
mW
V
IN Nominal 48XX 16
OUTPUT CHARACTERISTICS
Parameter Conditions MIN. TYP. MAX. Units
Voltage set point accuracy With external input/output capacitors ±1 ±5 %
Line regulation
Low line to high line with external input/
output capacitors
0.05 0.2 %
Load regulation
Minimum load to rated load with external
input/output capacitors
0.2 0.5 %
Ripple
BW = 20Hz to 300kHz with external input/
output capacitors
15 30 mV rms
Ripple & noise BW = DC to 20MHz with external input/
output capacitors
90 150 mV p-p
Cross regulation
% voltage change on negative output when
positive load varies from 12% to 50% with
negative load fixed at 50%
2.1 5.0 %
ABSOLUTE MAXIMUM RATINGS
Short-circuit protection Continuous
Lead temperature 1.5mm from case for 10 seconds 300°C
Minimum output load for specification
3
25% of rated output
Control pin input current 15mA
Input voltage 24 types
1
40V
Input voltage 48 types
1
80V
Free air space 10mm MIN. around component
1. Absolute maximum value for 30 seconds. Prolonged operation may damage the product.
2. Measured at full load with external input/output capacitors. Refer to application note.
3. A lower load condition can be used but higher levels of output ripple may be experienced, this condition may also cause the output
voltage to exceed its specification transiently during power down when the input voltage also falls below its rated minimum.
All specifications typical at T
A=25°C, Nominal input voltage and rated output current unless otherwise specified.
FEATURES
RoHS compliant
Compact SIP form factor
2:1 Wide range voltage input
Continuous short circuit protection with
current foldback
Operating temperature range
–40°C to +85°C
0.5% Load Regulation
1kVDC Isolation
24V & 48V nominal input
12V & 15V Output
Power density 1.00W/cm
3
Remote on/off
No electrolytic capacitors
Low noise
PRODUCT OVERVIEW
The NDH series is a range of high perfor-
mance miniature DC/DC converters having
regulated outputs over the wide temperature
range of –40°C to +85°C. The input voltage
range is 2:1 and the input to output isolation
is 1kVDC. Continuous short circuit protec-
tion, external control and extremely small SIP
packaging provide state of the art function-
ality. The use of ceramic capacitors and a
ceramic substrate, and SMD construction,
provide genuine high reliability. Nominal input
voltages of 24 and 48V with output voltages
of 12 and 15V are available as standard with
custom parts on request. The plastic case
is rated to UL 94V-0 with encapsulant to UL
94V-1.
NDH Series
Isolated 3W Dual Output DC/DC Converters
KDC_NDH.C02 Page 2 of 4
www.murata-ps.com/suppor t
TEMPERATURE CHARACTERISTICS
Parameter Conditions MIN. TYP. MAX. Units
Specification -40 85
°C
Operation -40 100
Storage -50 130
Case temperature rise above ambient 12V & 15V output types @ 100% load 36
MTTF (MEAN TIME TO FAILURE)
Part Number MTTF Units Conditions
NDH2412SC 2077
kHrs
Calculated using MIL-HDBK 217F with Nominal
input at full voltage (ground benign) at 25°C.
NDH2415SC 2080
NDH4812SC 2090
NDH4815SC 2045
GENERAL CHARACTERISTICS
Parameter Conditions MIN. TYP. MAX. Units
Control pin (CTRL) input current Please refer to control pin application note 6 15 mA
Switching frequency
Load causing lowest frequencies, 100% load VIN MIN. 100 125 150
kHz
Load causing highest frequencies, 25% load V
IN MAX. 300 400 500
ISOLATION CHARACTERISTICS
Parameter Conditions MIN. TYP. MAX. Units
Isolation test voltage Flash tested for 1 second 1000 VDC
Resistance VISO = 1000VDC 1GΩ
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 NDH 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?”
For a part holding no specific agency approvals, such as the NDH 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 NDH 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 specified 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.
NDH Series
Isolated 3W Dual Output DC/DC Converters
KDC_NDH.C02 Page 3 of 4
www.murata-ps.com/suppor t
RoHS COMPLIANCE INFORMATION
This series is compatible with RoHS soldering systems with a peak wave solder temperature of 300ºC
for 10 seconds. The pin termination finish on this product series is Tin Plate, Hot Dipped over Matte
Tin with Nickel Preplate. The series is backward compatible with Sn/Pb soldering systems.
For further information, please visit www.murata-ps.com/rohs
APPLICATION NOTES
External capacitance
Although these converters will work without external capacitors, they are neces-
sary in order to guarantee the full parametric performance over the full line and load
range. All parts have been tested and characterized using the following values and
test circuit.
Value
C
IN COUT
10μF, 200V 47μF, 25V
Test circuit
Control Pin
The NDH converters have a shutdown feature which enables the user to put the converter into a low power state. The control pin connects directly to the base of an
internal transistor, and the switch off mechanism for the NDH works by forward biasing this NPN transistor. If the pin is left open (high impedance), the converter will be
ON (there is no allowed low state for this pin), but once a control voltage is applied with sufficient drive current, the converter will be switched OFF. A suitable application
circuit is shown below.
D
1
(eg 1N4001) is required to provide high impedence when the signal
is low. From the NDH specification, the drive current to operate this
function is recommended to be 6mA, and hence the value of R
1
can be
derived as follows:
R
1
=
Assuming V
C
=5V, V
D
=0.7V and V
Q
=1V:
R
1
= = 550Ω
Cross Regulation
Load regulation is at its best when the positive and negative loads are balanced. When the loads are asymmetric, the negative output is not as tightly regulated as the
positive output. To meet ripple specification a total minimum load of 25% full load is required, however, the NDH can be used with much lighter loading at the expense
of increased ripple. A small load is required on the negative output of 150mW to ensure the maximum negative output voltage is not exceeded.
Cross regulation is defined as change in the negative output voltage as a percentage of nominal as the positive output load is changed from 12.5% to 50% with the
negative load is fixed at 50% of full load.
NDH
V
IN
V
C
OV
-V
IN
CTRL
R
1
D
1
Q
1
R
2
V
C
- V
D
- V
Q
I
C
5 - 0.7 - 1.0
6 x 10
-3
NDH
+VIN
+VOUT
-VOUT
OV
C
OUT
COUT
CIN
-VIN
P1-P3P4-P4

NDH2412SC

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Isolated DC/DC Converters TH 3W 24-12V SIP
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