NGA Series
Non-Isolated Wide Input DC/DC Converters
GENERAL CHARACTERISTICS
Parameter
Switching frequency
Transient response Max.
over-shoot
50% load change, 1.8V output types
50% load change, 2.5V output types
50% load change, 3.3V output types
50% load change, 5.0V output types
50% load change, 1.8V output types
50% load change, 2.5V output types
50% load change, 3.3V output types
50% load change, 5.0V output types
1.8V, 2.5V & 3.3V output types
5.0V output types
V
IN
Min. to V
IN
Max.
400VDC from 100pF capacitor via 1500Ω resistance
Conditions
Min.
270
Typ.
Max.
Units
Transient response Max.
under-shoot
Under voltage lock out
Start delay
ESD
300
330
kHz
90 (160)
84 (145)
mV (μs)
83 (130)
75 (40)
64 (160)
86 (145)
mV (μs)
84 (120)
74 (80)
4.0
V
5.0
100
ms
Meets MIL-STD-833F method 3015.7
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.
Test Circuit
Value
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.
1
= (22 [1.028V
O
-1])
-1
-0.011
R
D
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
open collector pull down or by using isolated delay contacts. To enable the device
output the shutdown pin should be left floating 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
=
(1.02V
O
)-1 -0.0455
R
U
91
(
)
All specifications typical at T
A
=25°C, nominal input voltage and rated output current unless otherwise specified.
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
KDC_NGAC.E02
Page 2 of 5
MURATA [ MURATA MANUFACTURING CO., LTD. ]
