NMA0505DC 데이터 시트보기 (PDF) - Murata Manufacturing
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NMA0505DC Datasheet PDF : 6 Pages
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NMA 5V, 12V & 15V Series
Isolated 1W Dual Output DC/DC Converters
APPLICATION NOTES (continued)
Ripple & Noise Characterisation Method
Ripple and noise measurements are performed with the following test configuration.
C1
1μF X7R multilayer ceramic capacitor, voltage rating to be a minimum of 3 times the output voltage of the DC/DC converter
C2
10μF tantalum capacitor, voltage rating to be a minimum of 1.5 times the output voltage of the DC/DC converter with an ESR of less
than 100mΩ at 100 kHz
C3
100nF multilayer ceramic capacitor, general purpose
R1
450Ω resistor, carbon film, ±1% tolerance
R2
50Ω BNC termination
T1
3T of the coax cable through a ferrite toroid
RLOAD
Resistive load to the maximum power rating of the DC/DC converter. Connections should be made via twisted wires
Measured values are multiplied by 10 to obtain the specified values.
Differential Mode Noise Test Schematic
SUPPLY
DC/DC Converter
++
Input Output
--
C1 C2 C3 R1
OSCILLOSCOPE
T1
R2
Y INPUT
R LOAD
Output Ripple Reduction
By using the values of inductance and capacitance stated, the output ripple at the rated load is lowered to 5mV p-p max.
Component selection
Capacitor: It is required that the ESR (Equivalent Series Resistance) should be as low as possible, ceramic types are recommended.
The voltage rating should be at least twice (except for 15V output), the rated output voltage of the DC/DC converter.
Inductor: The rated current of the inductor should not be less than that of the output of the DC/DC converter. At the rated current, the DC resistance of the inductor
should be such that the voltage drop across the inductor is <2% of the rated voltage of the DC/DC converter. The SRF (Self Resonant Frequency) should be
>20MHz.
L
Power
Source
DC
DC
C
Load
Inductor
Capacitor
L, μH
SMD
Through Hole
C, μF
NMA0505xC
22
82223C
11R223C
2.2uF
NMA0509xC
100
82104C
11R104C
0.47uF
NMA0512xC
150
82154C
11R154C
0.33uF
NMA0515xC
220
82224C
11R224C
1uF
NMA1205xC
22
82223C
11R223C
2.2uF
NMA1209xC
47
82473C
11R473C
1uF
NMA1212xC
150
82154C
11R154C
0.33uF
NMA1215xC
220
82224C
11R224C
1uF
NMA1505xC
22
82223C
11R223C
2.2uF
NMA1512xC
150
82154C
11R154C
0.33uF
NMA1515xC
220
82224C
11R224C
2.2uF
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KDC_NMA.G02 Page 4 of 6
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