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NPX20 Series
Isolated 20W Single Output DC/DC Converters
APPLICATION NOTES
OUTPUT VOLTAGE ADJUSTMENT
The trim resistor equations are:
R DOWN = (V OUT - L) x G - H
Where:
V NOM
G
1.8
5100
2.5
5100
3.3
5100
OB SOLE
R UP
=
V NOM - V OUT
GxL
V OUT - L - K
-H
H
L
K
TE
2000
1.224
0.576
2000
1.224
1.276
2000
1.224
2.076
TRIM UP
TRIM DOWN
+V IN
+V OUT
+V IN
+ V OUT
R DOWN
NPX20S
TRIM
NPX20S
TRIM
R UP
- V OUT
- V OUT
When the output voltage is trimmed up, output current must be derated so that the maximum output power (shown in the selection table) is not exceeded.
INPUT REFLECTED RIPPLE CURRENT
Input re?ected ripple current is measured with the following components connected to the power supply and across the input of the NPX20 DC/DC converter.
A 33μF low ESR (<0.7Ω) capacitor is connected across the input of the NPX. A large bulk capacitor 220μF (<100mΩ) is connected across the power supply,
followed by a series ?lter inductor of 12μH measured using current probe, scale 1mV/mA.
TYPICAL INPUT REFLECTED RIPPLE CURRENT V IN = 24V
TYPICAL INPUT REFLECTED RIPPLE CURRENT V IN = 48V
RoHS COMPLIANCE INFORMATION
This series is compatible with RoHS soldering systems with a peak re?ow solder temperature of
245oC. The pin termination ?nish on this product series is Matte Tin over Nickel Preplate. The series
is backward compatible with Sn/Pb soldering systems. This series has a Moisture Sensitivity Level
(MSL) 1.
For further information, please visit www.murata-ps.com/rohs
www.murata-ps.com
Technical enquiries email: mk@murata-ps.com, tel: +44 (0)1908 615232
2010/02/08
KDC_NPX20C.I01 Page 3 of 8
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