NGA SERIES
Non-Isolated Wide Input DC/DC Converters
APPLICATION NOTES
EXTERNAL CAPACITANCE
SHUTDOWN
VOLTAGE TRIMMING
External capacitors are necessary in
order to guarantee stability and full
parametric performance over the full line
and load range. All parts have
been tested and characterised using the
following values and test circuit.
When the shutdown pin is shorted to the
0V, the device’s output will be disabled.
To shutdown the device the pin should be
taken below 0.8V using either an open
collector pull down or by using isolated
relay contacts. To enable the device
output the shutdown pin should be left
floating or taken no less than +1.5V to
MAX (+28V).
The trimming (adjust) input on the device
allows output voltage adjustment to within
5% of the desired VOUT using a resistor
with a value determined by the following
equations.
2
When open circuit, the output will be +5V.
1
Value
A resistor (RD) between the trim pin and
the output pin will adjust the output
voltage between +5V to +1.8V.
CIN
COUT
100µF, 50V
100µF, 10V
If the shutdown pin is to be connected to
a long wire, it is recommended that a
capacitor (10nF) decouples the shutdown
pin to the 0V in order to avoid the risk of
injecting noise into the device circuit.
–1
1
TEST CIRCUIT
= (22(1.028VO–1)) –0.011
RD
VIN
VOUT
0V
NGA
NGA
RD
VIN
CIN
VOUT
VADJ
+
+
COUT
NGA
SD
OFF
A resistor (RU) between the trim pin and
the 0V pin will adjust the device output
from +5V to +5.5V.
GND
GND
BC182 or equiv
ON
TTL
10nF
1
(1.02VO)–1
91
(optional)
1KΩ
=
0.0455
RU
VIN
VOUT
NGA
VADJ
RU
1 Specifications typical at TA =25°C, nominal input voltage and rated output current unless otherwise specified.
2 Accuracy of adjustment is subject to tolerance of resistors and initial output accuracy.
SD
0V
C&D Technologies (NCL) Limited reserve the right to alter or improve the
specification, internal design or manufacturing process at any time, without
notice. Please check with your supplier or visit our web site to ensure that
you have the current and complete specification for your product before use.
C&D Technologies (NCL) Ltd
Tanners Drive, Blakelands North
Milton Keynes MK14 5BU, England
Tel: +44 (0)1908 615232
Fax:+44 (0)1908 617545
email: info@cdtechno-ncl.com
C&D Technologies Inc.
3400 E Britannia Drive, Tucson,
Arizona 85706, USA
Tel: +1 (800) 547-2537
Fax: +1 (520) 741-4598
email: sales@cdtechno.com
© C&D Technologies (NCL) Limited 2003
NDC NGA.3
No part of this publication may be copied, transmitted or stored in a
retrieval system or reproduced in any way including, but not limited to,
photography, photocopy, magnetic or other recording means, without prior
written permission from C&D Technologies (NCL) Limited.
www.cdpoweronline.com
Instructions for use are available from www.cdpoweronline.com
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