24IMS7-05-9 查看數據表（PDF） - Bel Fuse Inc.
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24IMS7-05-9 Datasheet PDF : 14 Pages
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IMX7, IMS7 Series Data Sheet
7-Watt DC-DC Converters
Input Transient Voltage Protection
In many applications transient voltages on the input of the
converter may occur and are possibly caused by short circuits
between Vi+ and Vi–, where the network inductance may
cause high energy pulses.
In order to protect the converters, transient suppressors are
fitted to the input; see table below:
Table 3: Built-in transient voltage suppressor
Model
20IMX7 1
24IMS7 2
40IMX7 2
48IMS7 2
70IMX7 2
110IMX7 2
Breakdown
Voltage
VBR nom
Peak Power
at 1 ms
PP
Peak Pulse
Current
IPP
overvoltage lockout at approx. 38 V
53 V
600 W
7.7 A
100 V
1500 W
11 A
100 V
600 W
4.1 A
144 V
600 W
2.9 A
167 V
600 W
2.5 A
1 The built-in overvoltage trigger shuts down the converter at
approx. 38 V protecting the input up to 50 V. For higher transient
voltages an external suppressor or voltage limiting circuit as, e.g.,
for IEC/EN 61000-4-5, level 2 compliance should be provided.
2 If transients generating currents above the peak pulse current are
possible, an external limiting network such as the circuit
recommended for IEC/EN 61000-4-5, level 2 compliance, is
necessary.
To achieve IEC/EN 61000-4-5, level 2 compliance, an
additional inductor and capacitor should be provided externally
as shown in the figure below. The components should have
similar characteristics as listed in table 4.
07064
L
Vi+
+
i
C
D
Note: Suppressor diode D is only necessary for 20IMX7 models.
To withstand 150 V transients according to 19 Pfl 1, applicable for
40IMX7 models, the same external circuitry with similar
components as for IEC/EN 61000-4-5, level 2 compliance can be
used.
Input Fuse and Reverse Polarity Protection
The suppressor diode on the input also provides for reverse
polarity protection by conducting current in the reverse
direction, thus protecting the converter. An external fuse is
required to limit this current. We recommend for:
– 20IMX7 and 24IMS7 a fast 2 A (F2A) fuse
– 40IMX7 and 48IMS7 a fast 1 A (F1A) fuse
– 70IMX7 a fast 0.63 A (F.63A) fuse
– 110IMX7 a fast 0.63 A (F.63A) fuse.
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 limit this current further.
A
04030a
4
3
2
1
0
0
20
40
60
80 µs
Fig. 5
Typical inrush current at Vi nom , Po nom measured according to
ETS 300132-2 (40IMX7).
Vi–
Fig. 4
Example for external circuitry to comply with IEC/EN
61000-4-5, level 2 (transzorb D only for 20IMX7).
Table 4: Components for external circuitry to comply with
IEC/EN 61000-4-5, see table 8
Model
20IMX7
24IMS7
40IMX7
48IMS7
70IMX7
110IMX7
L
330 µH, 1 A, 0.115 Ω
–
330 µH, 0.6 A, 0.42 Ω
–
1000 µ H, 0.6 A, 0.42 Ω
330 µH, 0.2 A
C
D
68 µF, 63 V 1.5KE39A
–
–
47 µF, 100 V 1.5KE100A
–
–
22 µF, 160 V 1.5KE120A
22 µF, 200 V 1.5KE170A
BCD20007-G Rev AF, 31-Jul-2015
MELCHER
The Power Partners.
Page 6 of 14
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