20IMX4-12-8 Datasheet, PDF (4/12 Pages) Power-One – IMX4 Series Data Sheet 4 Watt DC-DC Converters

IMX4 Series Data Sheet
®
4 Watt DC-DC Converters
Electrical Input Data
General conditions: T_A = 25 °C, unless T_C is specified.
Table 2: Input Data
Input
5IMX4
20IMX4
40IMX4
70IMX4
Unit
Characteristics
Conditions
min typ max min typ max min typ max min typ max
V_i
Input voltage range
V_{i nom} Nominal input voltage
T_{C min} to T_{C max}
I_o = 0 to I_{o nom}
4.7 5.0 16.8 8.4
36 16.8 ²
75 40
121
5.0
20
40
70
V_{i sur} Repetitive surge voltage abs. max input (3 s)
--
40
100
150
t_start-up Converter start-up time¹ Worst case condition at
V_{i min} and full load
0.25 0.5
0.25 0.5
0.25 0.5
0.25 0.5
t_rise Rise time ¹
V_{i nom}
I_{o nom}
resistive load
--
capacitive load
--
5
5
5
12
12
12
VDC
s
ms
I_{i o}
No-load input current I_o = 0, V_{i min} to V_{i max}
--
15 20
5 10
5 10 mA
C _i Input capacitance
--
0.54
0.3
0.15
µF
I_{inr p} Inrush peak current
V_i = V_{i nom} ³
3.8
3.7
4.2
5.6
A
f_s
Switching frequency
V_{i min} to V_{i max}, I_o = 0 to I_{o nom}
400
400
400
400
kHz
I_{i rr} Reflected ripple current I_o = 0 to I_{o nom}
--
100
60
30 mA_pp
v_{i RFI} Input RFI level
conducted
EN 55011/55022 ⁴
--
A
A
A
Class
1 _{Measured with a resistive or max. admissible capacitive load; see fig. 5}
2 _{Operation at lower input voltage possible: Po approx. 80% of Po nom at Vi min = 14.4 V}
3 _{Source impedance according to ETS 300132-2, version 4.3.}
4 _{External capacitors required according to table 3.}
Start-up
V_o
V_{o nom}
t_rise
04008b
Fig. 5
t_startup
t
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.
A
04034a
3
2
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).
04035b
Vi+
+ _Ci
Fig. 7
Vi–
Input capacitors
Table 3: Input electrolytic capacitors
Model
C_i
20IMX4
100 µF
50 V
40IMX4
47 µF
100 V
70IMX4
330 µF
200 V
1
0
Fig. 6
0
10
20
30
40 µs
Typ. inrush current at V_{i nom}, P_{o nom} versus time measured
according to ETS 300132-2, version 4.3 (40IMX4).
BCD20006-G Rev AC, 06-Jul-2012
Page 4 of 12
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