DC/DC Converter

URA_LD-20WR3 & URB_LD-20WR3 Series

2015.09.28-A/3

Page 2 of 9

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Input Specifications

Item

Operating Conditions

Min.

Typ.

Max.

Unit

Input Current (full load / no-load)

24VDC input

3.3V output

--

799/40

818/45

mA

5V output

--

969/40

993/45

Others

--

948/6

941/10

48VDC input

3.3V output

--

400/20

409/25

5V output

--

485/20

497/25

Others

--

474/5

485/9

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 Voltage Shutdown

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

Ctrl*

Module switch on

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

Module switch off

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

Input current when switched off

--

4

7

mA

Hot Plug

Unavailable

Note: *The voltage of Ctrl pin is relative to input pin GND.

Output Specifications

Item

Operating Conditions

Min.

Typ.

Max.

Unit

0%-100% load

--

±1

±3

%

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

Positive Output

--

±0.2

±0.5

Negative Output

--

±0.5

±1

5%-100% load

Positive Output

--

±0.5

±1

Negative Output

--

±0.5

±1.5

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

--

--

±0.03

%/℃

20MHz bandwidth, 5%-100% load

--

50

100

Mv p-p

Trim

Input voltage range

--

±10

--

%Vo

Over-voltage Protection

110

--

160

Over-current Protection

110

--

190

%Io

Short circuit Protection

Hiccup, Continuous, self-recovery

Note:①At 0%~5% load, the Max. output voltage accuracy of ±5VDC/±9VDC output converter is ±5%.

②

When testing from 0% to100%load working conditions，load regulation index of ±5%；

③

0%-5% load ripple&Noise is no more than 5%Vo.Ripple and noise are measured by “parallel cable” method, please see DC-DC Converter Application

Notes for specific operation.