NMJ Series
5.2kVDC Isolated 1W DC/DC Converters
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
Through Hole
SMD
C, μF
3.3V single output types
5V single output types
9V single output types
12V single output types
15V single output types
22
22
47
220
220
22R223C
22R223C
22R473C
22R224C
22R224C
82223C
82223C
82473C
82224C
82224C
4.7
4.7
2.2
0.47
0.47
+V OUT
L
Power
Source
DC
DC
OV
-V OUT
C
C
Load
Load
L
Inductor
Capacitor
L, μH
Through Hole
SMD
C, μF
5V dual output types
9V dual output types
12V dual output types
15V dual output types
22
47
220
220
22R223C
22R473C
22R224C
22R224C
82223C
82473C
82224C
82224C
4.70
2.2
0.47
0.47
Capacitive loading and start up
Typical start up times for this series, with a typical input voltage rise time of 2.2μs and output capacitance of 10μF, are shown in the table below. The product
series will start into a capacitance of 47μF with an increased start time, however, the maximum recommended output capacitance is 10μF.
Start-up time
μs
Start-up time
μs
Typical Start-Up Wave Form
NMJ0505SC
NMJ0509SC
NMJ0512SC
NMJ0515SC
NMJ1205SC
NMJ1209SC
NMJ1212SC
NMJ1215SC
NMJ0303SAC
NMJ0503SAC
2530
7865
13080
21560
2770
20455
14475
22300
530
576
NMJ0505SAC
NMJ0509SAC
NMJ0512SAC
NMJ0515SAC
NMJ1205SAC
NMJ1209SAC
NMJ1212SAC
NMJ1215SAC
1059
3454
7980
11505
1286
3548
7355
11535
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KDC_NMJ.G05 Page 3 of 6
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