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参数资料
| 型号： | 20IMX7-24-24-9L |
| 元件分类： | 电源模块 |
| 英文描述： | 2-OUTPUT 7 W DC-DC REG PWR SUPPLY MODULE |
| 文件页数： | 15/18页 |
| 文件大小： | 299K |
| 代理商： | 20IMX7-24-24-9L |
Board Mountable
DC-DC Converters
IMX 7 Series
Edition 6/5.2000
6/18
Input Transient Voltage Protection
In many applications transient voltages on the input of the
converter are always possible. These may be caused for ex-
ample by short circuits between Vi+ and Vi– where the net-
work inductance may cause high energy pulses.
In order to protect the converters the IMX 7 types have a
built-in transient protection as per table below:
Reverse Polarity Protection at Input
The suppressor diode on the input also provides for reverse
polarity protection by conducting current in the reverse di-
rection, thus protecting the unit. An external fuse is required
to limit this current:
– For 20 IMX 7 a fast 2 A (F2A) fuse is recommended.
– For 40 IMX 7 a fast 1 A (F1A) fuse is recommended.
– For 70 IMX 7 a fast 0.63 A (F.63A) fuse is recommended.
– For 110 IMX 7 a fast 0.63 A (F.63A) fuse is recommended.
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.
Vi+
Vi–
07064
C
L
D
+
i
Fig. 6
Example for external circuitry to comply with
IEC/EN 61000-4-5, level 2 (transzorb D not necessary for
40/70/110 IMX 7 types).
Table 3: Built-in transient voltage suppressor
Type
Breakdown
Peak Power
Peak Pulse
Voltage
at 1 ms
Current
VBR nom
PP
IPP
20 IMX 7 1
over voltage lockout at approx. 38 V
40 IMX 7 2
100 V
1500 W
11 A
70 IMX 7 2
144 V
600 W
2.9 A
110 IMX 7 2
167 V
600 W
2.5 A
1 The built-in overvoltage lockout circuit shuts down the converter
at approx. 38 V protecting the input up to 50 V DC. 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 then an external limiting network such as the circuit
recommended for IEC/EN 61000-4-5, level 2 compliance is
necessary.
Table 4: Components for external circuitry to comply with IEC/EN 61000-4-5
Circuit Ref.
20 IMX 7
40 IMX 7
70 IMX 7
110 IMX 7
L
330
H, 0,115 , 1 A
330
H, 0,42 , 600 mA
1000
H, 2.9 , 290 mA
330
H, 0.65 , 430 mA
TDK SF-T8-110S-01
TDK TSL1110-331KR55
Toko 822LY-102K
Toko 822LY-331K
C
68
F, 63 V, 85°C
68
F, 100 V, 85°C
47
F, 150 V, 85°C
200
F, 200 V, 105°C
D
Motorola 1.5KE39A
n.a.
Fig. 7
Dimensions of inductor L.
(TDK SF-T8-110S-01)
8.5
5
7.5
5
0.7
04032
To achieve IEC/EN 61000-4-5, level 2 compliance an addi-
tional inductor and capacitor should be provided externally
as shown in the figure below. The components should have
similar characteristics as listed in table:
Components for
external circuitry to comply with IEC/EN 61000-4-5.
Please note: The suppressor diode D is only necessary for
20 IMX 7 types. To withstand 150 V transients according to
19 Pfl 1, applicable for 40 IMX 7 types, the same external
circuitry with similar components as for IEC/EN 61000-4-5,
level 2 compliance can be used.
11.5
5
10.5
5
0.7
04029
25
10
17.5
04033
Fig. 8
Dimensions of inductor L.
(TDK TSL1110-331KR55)
Fig. 9
Dimensions of inductor L.
(Toko R622LY-102K)
1 A/Div.
10
s/Div.
04030
0
1
2
3
4
Fig. 10
Typical inrush current at Ui nom, Po nom vs. time (40 IMX 7)
measured according to prETS 300132-2 (Version 4.3)
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