DC/DC Converter

URA_LD-20WR3 & URB_LD-20WR3 Series

2014.07.17-A/0

Page 2 of 8

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Input Specifications

Item

Operating Conditions

Min.

Typ.

Max.

Unit

Input Current (full load / no-load)

24VDC input

3.3V, 5V output

--

926/40

--

mA

Others

--

926/5

--

48VDC input

3.3V, 5V output

--

463/20

--

Others

--

463/4

--

Reflected Ripple Current

24VDC input

--

30

--

48VDC input

--

30

--

Input impulse Voltage(1sec.max.)

24VDC input

-0.7

--

50

VDC

48VDC input

-0.7

--

100

Starting Voltage

24VDC input

--

--

9

48VDC input

--

--

18

Under VoltageShutdown

24VDC input

5.5

6.5

--

48VDC input

14.0

15.5

--

Starting Time

Nominal input& constant resistance load

--

10

--

ms

Input Filter

Pi filter

Module switch on

Ctrl suspended or connected toTTL high level (3.5-12VDC)

Module switch off

Ctrl pin connected to GND or low level (0-1.2VDC)

Input current when switched off

--

47

Ma

Note: *The voltage of Ctrl pin is relative toinput pinGND.

Output Specifications

Item

Operating Conditions

Min.

Typ.

Max.

Unit

Positive Output Voltage Accuracy

--

±1

±3

%

Negative Output Voltage Accuracy

Balance of Output Voltage

Dual output, balanced load

--

±0.5

±1.5

Line Regulation

Full load, the input voltage is from low voltage

to high voltage

--

±0.2

±0.5

Load Regulation

10%-100% load

--

±0.5

±1

Cross Regulation

Dual output, main output 50% load,

Supplement output from 10% to 100% load

--

--

±5

Transient Recovery Time

25% load step change

--

300

500

μs

Transient Response Deviation

3.3V, 5V, ±5V output

--

±5

±8

%

Others

--

±3

±5

Temperature Drift Coefficient

Full load

--

±0.02

--

%/℃

Ripple & Noise

20MHz bandwidth

--

50

100

Mv p-p

Trim

Input voltage range

--

±10

--

%Vo

Output Over-voltage Protection

110

--

160

Output Over-current Protection

110

--

190

%Io

Output Short circuit Protection

Hiccup, Continuous, self-recovery

Note: * Ripple and noise tested with “parallel cable” method, please see

General Specifications

Item

Operating Conditions

Min.

Typ.

Max.

Unit

Insulation Voltage

Input-output, with the test time of 1 minute and the

leak current lower than 1mA

1500

--

--

VDC

Insulation Resistance

Input-output, insulation voltage 500VDC

1000

--

--

MΩ

Isolation Capacitance

Input-output, 100KHz/0.1V

--

1050

--

pF

Operating Temperature

see Fig. 1

-40

--

85

℃

Storage Temperature

-55

--

125

Storage Humidity

Non-condensing

5

--

95

%RH

Max. Operating Temperature

for casing

Within the operating temperature curve

--

--

105

℃