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URA_LD-20WR2 & URB_LD-20WR2

2013.11.29-A/3

Page 2 of 10

Note: ①Series with suffix

“H” are heat sink mounting; series with suffix “A2S” are chassis mounting，with suffix “A4S” are DIN-Rail mounting, for example

URB2405LD-20WHR2A2S is chassis mounting of with heat sink,URB2405LD-20WR2A4S is DIN-Rail mounting of without heat sink;If the application hasa

higher requirement for heat dissipation, you can choose modules with heat sink;

②Absolute maximum rating without damage on the converter;

③For dual-output-converters the given value is for one output (for both outputs the same value);

④The efficiency of "A2S" and "A4S" is approx. 2% lower for the protection of inverse polarity.

INPUT SPECIFICATIONS

Item

Test conditions

Min.

Typ.

Max.

Unit

Input Surge Voltage (1sec. max.)

24VDC Input

-0.7

--

50

VDC

48VDC Input

-0.7

--

100

Start-up Voltage

24VDC Input

--

--

9

48VDC Input

--

--

17.8

Under Voltage Shutdown

24VDC Input

7.5

--

--

48VDC Input

16

--

--

Start-up time

Nominal input & constant resistance load

--

10

--

ms

Models ON

Ctrl open or connect TTL high level (2.5-12VDC)

Models OFF

Ctrl connect GND or low level (0-1.2VDC)

Input current (Models OFF)

--

1

--

mA

Input filter

Pi Filter

Note:*The Ctrl control pin voltage is refer to GND.

OUTPUT SPECIFICATIONS

Item

Test Conditions

Min.

Typ.

Max.

Unit

Positive Output Voltage Accuracy

--

±1

±3

%

Negative Output Voltage Accuracy

Output Voltage Balance

Dual output，Balance load

--

±0.5

±1

Line Regulation

Full load, Input voltage from low to high

--

±0.2

±0.5

Load Regulation

10% to 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

±5

%

Temperature Drift

100% load

--

±0.02

--

%/

°C

Ripple & Noise*

20MHz Bandwidth

--

70

100

mVp-p

Output voltage Trim

--

±10%

--

VDC

Output Over Voltage Protection

3.3V output

--

3.9

--

5V output

--

6.2

--

9V output

--

10.8

--

12V output

--

15

--

15V output

--

18

--

24V output

--

30

--

Over Current Protection

Input voltage range

--

160

--

%

Output Short Circuit Protection

Hiccup, Continuous, automatic recovery

Note:* Ripple and noise tested with

“parallel cable” method. See detailed operation instructions at DC-DC application notes.

COMMON SPECIFICATIONS

Item

Test Conditions

Min.

Typ.

Max.

Unit

Isolation Voltage

Input-Output, Tested for 1 minute ,leakage current less than 1 mA

1500

--

--

VDC

Isolation Resistance

Input-Output, Test at 500VDC

1000

--

--

M

Ω

Isolation Capacitance

24V output

Input/Output,100KHz/0.1V

--

2000

--

pF

Others

--

1000

--

Switching Frequency

URB2424LD-20WR2 PWM mode

315

--

345

KHz

Others

PWM mode

--

300

--

MTBF

MIL-HDBK-217F@25℃

1000

--

--

K hours

Safety approvals

URB48XXLD-20WR2

UL60950, EN60950

Others

EN60950