24IMS15 データシートの表示（PDF） - Bel Fuse Inc.
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24IMS15 Datasheet PDF : 19 Pages
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IMX15, IMY15, IMS15 Series Data Sheet
15 Watt DC-DC Converters
Inrush Current
The inrush current has been made as low as possible by
choosing a very small input capacitance. A series resistor may
be installed in the input line to further reduce this current.
A
04022b
4
3
2
1
t
0
20
40
60
80
100 µs
Fig. 4
Typical inrush current at Vi nom, Po nom versus time
(40IMX15). Source impedance according to
ETS 300132-2 at Vi nom.
Vo
Vo nom
trise
04008b
Model
20IMX15
24IMS15
40IMX15, 48IMS15
110IMY15
Fuse type
F 4.0 A
F 3.15 A
F 2.0 A
F 1.0 A
Input Transient Voltage Protection
A built-in suppressor diode provides effective protection
against input transients, which typically occur in many
installations.
Table 5: Built-in transient voltage suppressor
Type
20IMX15
Breakdown
voltage
VBr nom [V]
40
Peak power
at 1 ms
Pp [W]
1500
Peak pulse
current
Ipp [A]
22
24IMS15
53
600
7.7
40IMX15
100
48IMS15
100
110IMY15
168
1500
9.7
600
4.1
600
0.5
tstartup
t
Fig. 5
Converter start-up and rise time
Input Undervoltage Lockout
A special feature of these converters is the accurate
undervoltage lockout protection, which protects against large
currents caused by operation at low voltages. This ensures
easier start-up in distributed power systems.
Tab. 3: Turn on and turn off voltage
Model
Turn on
Turn off
Unit
min
max min
20IMX15
7.5
8
7
max
7.5
V
24IMS15
12.5
13.5
12
13
40IMX15
12.5
13.5
12
13
48IMS15
31.5
32.5
31
32
110IMY15
40
42.5
38
40.5
Fuse and Reverse Polarity Protection
The built-in suppressor diode also provides for reverse polarity
protection at the input by conducting current in the reverse
direction. An external fuse is required to limit this current.
Table 4: Recommended external fuses
For very high energy transients as for example to achieve
compliance to IEC/EN 61000-4-5 (see table Electromagnetic
Immunity), an external inductor and a capacitor are required,
see Fig. 6. The components are specified in table 6.
L
JM234
Vi+
+
C
+
C
20IMX15
40IMX15
110IMY15
Vi–
Fig. 6
Example for external circuitry to achieve better transient
immunity. Values of components in the table below.
Table 6:
Components for external circuitry for IEC/EN 61000-4-5,
level 3 compliance.
Model
20IMX15
24IMS15
40IMX15
48IMS15
110IMY15
Inductor (L)
220 µH, 2.7 A
220 µH, 1.3 A
220 µH, 1.3 A
220 µH, 1 A
220 µH, 0.4 A
Capacitor (C)
2 x 330 µF, 63 V
2 x 330 µF, 63 V
2 x 330 µF, 100 V
2 x 330 µF, 100 V
2 x 330 µF, 200 V
BCD20008-G Rev AE, 25-Aug-2017
MELCHER
The Power Partners.
Page 7 of 19
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