DC/DC Converter

URF_LP-20WR3 Series

2014.07.22-A/0

Page 3 of 6

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EMC Specifications

EMI

Conducted disturbance

CISPR22/EN55022 CLASS A (Bare component)/

CLASS B (see Fig.3-② for recommended circuit)

Radiated emission

CISPR22/EN55022 CLASS A (Bare component)/

CLASS B (see Fig.3-② for recommended circuit)

EMS

Electrostatic discharge

IEC/EN61000-4-2

Contact ±4KV

perf. Criteria B

Radiation immunity

IEC/EN61000-4-3

10V/m

perf. Criteria A

EFT

IEC/EN61000-4-4

±2KV (see Fig.3-① for recommended circuit)

perf. Criteria B

Surge immunity

IEC/EN61000-4-5

±2KV (see Fig.3-①for recommended circuit)

perf. Criteria B

Conducted disturbance immunity

IEC/EN61000-4-6

3 Vr.m.s

perf. Criteria A

Immunities of voltage dip,

drop and short interruption

IEC/EN61000-4-29 0-70%

perf. Criteria B

Product Characteristic Curve

Operating Temperature( )

℃

Temperature Derating Curve

-40

04055

85

120

80

60

100

120

40

20

0

Safe Operating Area

Fig. 1

URF2405LP-

20WR3

70

75

80

85

90

95

100

9

1215

1821

242730

3336

Input Voltage(V)

Efficiency Vs Input Voltage(Full Load)

URF2405LP-

20WR3

40

50

60

70

80

90

100

5

102030405060708090 100

Output Current Percentage(%)

Efficiency Vs Output Load(Vin=Vin-nominal)

URF4815LP-

20WR3

50

55

60

65

70

75

80

85

90

95

100

18 24 30 36 42 48 54 60 66 72 75

Input Voltage (V)

Efficiency Vs Input (Full Load)

URF4815LP-

20WR3

50

55

60

65

70

75

80

85

90

95

100

5

102030405060708090 100

Output Current Percentage (%)

Efficiency Vs Output Load(Vin=Vin-nominal)

Design Reference

1. Typical application

All the DC/DC converters of this series are tested according to the recommended circuit (see Fig. 2) before delivery.

If it is required to further reduce input and output ripple, properly increase the input & output of additional capacitors Cin and Cout or

select capacitors of low equivalent impedance provided that the capacitance is no larger than the max. capacitive load of the product.

Vin

GND

+Vo

0V

DC

Cin

DC

Cout

Fig. 2

Vin(VDC)

Cout(μF)

Cin(μF)

3.3/5

470

100

9/12/15

220

24

100