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NGA Series
Non-Isolated Wide Input DC/DC Converters
APPLICATION NOTES
External Capacitance
External capacitors are necessary in order to guarantee stability and full paramet-
ric performance over the full line and load range. All parts have been tested and
characterised using the following values and test circuit.
Value
Test Circuit
C IN
100μF, 50V
C OUT
100μF, 10V
Voltage trimming
The trimming (adjust) input on the device allows output voltage adjustment to
within ±5% 1 of the desired V OUT using a resistor with a value determined by the
following equations.
When open circuit, the output will be +5V.
A resistor (R D ) between the trim pin and the output pin will adjust the output volt-
age between +5V to +1.8V.
Shutdown
When the shutdown pin is shorted to Common, the device’s output will be dis-
abled. To shutdown the device the pin should be taken below 0.8V using either an
1
R D
= (22 [1.028V O -1]) -1 -0.011
open collector pull down or by using isolated delay contacts. To enable the device
output the shutdown pin should be left ?oating or taken no lower than +1.5V to a
maximum of (+28V).
If the shutdown pin is to be connected to a long wire, it is recommended that a
capacitor (10nF) decouples the shutdown pin to Common in order to avoid the risk
of injecting noise into the device circuit.
A resistor (R U ) between the trim pin and the Common pin will adjust the device
output from +5V to +5.5V.
1
R U
91
= ( (1.02V O )-1 ) -0.0455
All speci?cations typical at T A =25°C, nominal input voltage and rated output current unless otherwise speci?ed.
1. Accuracy of adjustment is subject to tolerance of resistors and initial output accuracy.
www.murata-ps.com
Technical enquiries email: mk@murata-ps.com, tel: +44 (0)1908 615232
2013-01-24
KDC_NGAC.F03 Page 3 of 6
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