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參數(shù)資料
| 型號(hào)： | 70IMX7-12-12-8Z |
| 廠商： | POWER-ONE INC |
| 元件分類(lèi)： | 電源模塊 |
| 英文描述： | 2-OUTPUT 7.2 W DC-DC REG PWR SUPPLY MODULE |
| 封裝： | ROHS COMPLIANT PACKAGE-9 |
| 文件頁(yè)數(shù)： | 10/14頁(yè) |
| 文件大?。?/td> | 321K |
| 代理商： | 70IMX7-12-12-8Z |
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BCD20007 Rev AA
Page 5 of 14
www.power-one.com
IMX7 DC-DC Series Data Sheet
7-Watt DC-DC Converters
Input Transient Voltage Protection
In many applications transient voltages on the input of the
converter are always possible caused, for example 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
Breakdown
Peak Power
Peak Pulse
Voltage
at 1 ms
Current
VBR nom
PP
IPP
20IMX7 1
overvoltage lockout at approx. 38 V
40IMX7 2
100 V
1500 W
11 A
70IMX7 2
144 V
600 W
2.9 A
110IMX7 2
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.
Table 4: Components for external circuitry to comply with IEC/EN 61000-4-5
Circuit Ref.
20IMX7
40IMX7
70IMX7
110IMX7
L
330 H, 0.115
330 H, 0.42
1000 H, 2.9
330 H
1 A
600 mA
290 mA
200 mA
C
68 F, 63 V
68 F, 100 V
47 F, 150 V
200 F, 200 V
D
1.5KE39A
n.a.
Fig. 4
Example for external circuitry to comply with IEC/EN
61000-4-5, level 2 (transzorb D only for 20IMX7).
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.
Note: The suppressor diode D is only necessary for 20IMX7
models. To withstand 150 V transients according to 19 Pfl 1,
applicable for 40 IMX7 models, the same external circuitry with
similar
components
as
for
IEC/EN
61000-4-5,
level
2
compliance can be used.
Vi+
Vi–
07064
C
L
D
+
i
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 a fast 2 A (F2A) fuse
– For 40IMX7 a fast 1 A (F1A) fuse
– For 70IMX7 a fast 0.63 A (F.63A) fuse
– For 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.
Fig. 5
Typical inrush current at Vi nom , Po nom measured according to
ETS 300132-2 (40IMX7).
0
1
2
3
A
0
20
40
60
80 s
04030a
4
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