KDC_NGAC.E02 Page 2 of 5

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NGA Series

Non-Isolated Wide Input DC/DC Converters

GENERAL CHARACTERISTICS

Parameter

Conditions

Min.

Typ.

Max.

Units

Switching frequency

270

300

330

kHz

Transient response Max.

over-shoot

50% load change, 1.8V output types

90 (160)

mV (μs)

50% load change, 2.5V output types

84 (145)

50% load change, 3.3V output types

83 (130)

50% load change, 5.0V output types

75 (40)

Transient response Max.

under-shoot

50% load change, 1.8V output types

64 (160)

mV (μs)

50% load change, 2.5V output types

86 (145)

50% load change, 3.3V output types

84 (120)

50% load change, 5.0V output types

74 (80)

Under voltage lock out

1.8V, 2.5V & 3.3V output types

4.0

V

5.0V output types

5.0

Start delay

100

ms

ESD

400VDC from 100pF capacitor via 1500Ω resistance

Meets MIL-STD-833F method 3015.7

APPLICATION NOTES

External Capacitance

Test Circuit

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

100μF, 50V

100μF, 10V

Voltage trimming

The trimming (adjust) input on the device allows output voltage adjustment to

following equations.

When open circuit, the output will be +5V.

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

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.

output from +5V to +5.5V.

1. Accuracy of adjustment is subject to tolerance of resistors and initial output accuracy.

1

91

-0.0455

=

(

)

1