DC/DC Converter

URF_LP-20WR3 Series

2015.08.12-A/2

Page 2 of 6

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Input impulse Voltage (1sec. max.)

24VDC input

-0.7

--

50

VDC

48VDC input

-0.7

--

100

Starting Voltage

24VDC input

--

--

9

VDC

48VDC input

--

--

18

under-voltage turn-off

24VDC input

5.5

6.5

--

14.0

15.5

--

Starting Time

Nominal input& constant resistance load

--

10

--

ms

Input Filter

Pi filter

Hot Plug

Unavailable

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

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

Output Specifications

Item

Operating Conditions

Min.

Typ.

Max.

Unit

Output Voltage Accuracy

--

±1

±3

%

Line Regulation

Full load, the input voltage is from low voltage to

high voltage

--

±0.2

±0.5

Load Regulation

0%-100% load

--

±0.5

±1

Transient Recovery Time

25% load step change

--

300

500

µs

Transient Response Deviation

3.3V,5V output

--

±5

±8

%

Others

--

±3

±5

Temperature Drift Coefficient

Full load

--

--

±0.03

%/℃

20MHz bandwidth,5%-100% load

--

50

100

mV p-p

Over-voltage Protection

Input voltage range

110

--

160

%Vo

Output Voltage Regulation Trim

--

±10

--

%Vo

Over-current Protection

110

--

190

%Io

Short circuit Protection

Hiccup, continuous, self-recovery

Note: *Ripple and noise are measured by “parallel cable” method, please see DC-DC Converter Application Notes for specific operation.

0%-5% load ripple&Noise is no more than 5%Vo.

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

3000

--

--

VDC

Insulation Resistance

Input-output, insulation voltage 500VDC

1000

--

--

MΩ

Isolation Capacitance

Input-output, 100KHz/0.1V

--

500

--

pF

Operating Temperature

Derating if the temperature is ≥55℃ (see Fig. 1)

-40

--

+85

℃

Storage Temperature

-55

--

+125

Storage Humidity

Non-condensing

5

--

95

%RH

Pin Welding Resistance

Temperature

Welding spot is 1.5mm away from the casing, 10

seconds

--

--

+300

℃

Vibration

10-55Hz, 10G, 30 Min. along X, Y and Z

PWM mode

--

270

--

KHz

MTBF

MIL-HDBK-217F@25℃

1000

--

--

K hours

Note:*This series of products using reduced frequency technology, the switching frequency is test value of full load,When the load is reduced to below 50%, the

switching frequency decreases with decreasing load.

Physical Specifications

Casing Material

Plastic (UL94-V0)

Package Dimensions

Horizontal package

51.50*26.50*12.00 mm

A2S wiring package

76.00*31.50*21.20 mm