IMX4 Series Data Sheet

4 Watt DC-DC Converters

BCD20006-G Rev AE, 16-Sep-2015

Page 4 of 12

MELCHER

The Power Partners.

Table 3: Input electrolytic capacitors

Model

20IMX4

40IMX4

70IMX4

100

µF

47

µF

330

µF

50 V

100 V

200 V

Electrical Input Data

Table 2: Input Data

Input

5I MX4

20IMX4

40IMX4

70IMX4

Unit

Characteristics

Conditions

min

typ max min typ max min typ max min typ max

Input voltage range

4.7

5.0 16.8 8.4

75

40

121

VDC

Nominal input voltage

5.0

20

40

70

Repetitive surge voltage abs. max input (3 s)

--

40

100

150

0.25 0.5

0.25 0.5

0.25 0.5

0.3

0.6

s

resistive load

--

5

5

5

ms

capacitive load

--

12

12

12

No-load input current

--

15

20

5

10

5

10

mA

Input capacitance

--

0.54

0.3

0.15

µF

Inrush peak current

3.8

3.7

4.2

5.6

A

Switching frequency

400

400

400

400

kHz

Reflected ripple current

--

100

60

30

Input RFI level

--

A

A

A

Class

conducted

1

Measured with a resistive or max. admissible capacitive load; see fig. 5

2

3

Source impedance according to ETS 300132-2, version 4.3.

4

External capacitors required according to table 3.

Fig. 5

Converter start-up and rise time

Inrush Current

The inrush current has been kept as low as possible by

choosing a very small input capacitance. A series resistor may

be inserted in the input line to further limit this current.

Fig. 6

according to ETS 300132-2, version 4.3 (40IMX4).

Fig. 7

Input capacitors

A

0

10

20

30

40

µs

04034a

0

1

2

3

Start-up

Filter to Comply with EN 55011/55022

Electromagnetic emission requirements according to table

Electrical Input Data can be achieved by adding an external

capacitor as close as possible to the input terminals (see fig. 7

and table 3).

Vi+

Vi–

04035b

+

t

04008b