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参数资料
| 型号： | 70IMX7-03-8ZG |
| 厂商： | POWER-ONE INC |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT 7 W DC-DC REG PWR SUPPLY MODULE |
| 封装： | ROHS COMPLIANT PACKAGE-14 |
| 文件页数： | 12/15页 |
| 文件大小： | 374K |
| 代理商： | 70IMX7-03-8ZG |
BCD20007-G Rev AD, 4-Nov-09
Page 6 of 15
www.power-one.com
IMX7/IMS7 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 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
Breakdown
Peak Power
Peak Pulse
Voltage
at 1 ms
Current
VBR nom
P P
IPP
20IMX7 1
overvoltage lockout at approx. 38 V
24IMS7 2
53 V
600 W
7.7 A
40IMX7 2
100 V
1500 W
11 A
48IMS7 2
100 V
600 W
4.1 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.
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.
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.
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
Table 4: Components for external circuitry to comply with
IEC/EN 61000-4-5
Model
L
C
D
20IMX7
330
μH, 1 A, 0.115
Ω
68
μF, 63 V
1.5KE39A
24IMS7
330
μH, 0.6 A, 0.42
Ω
68
μF, 63 V
n.a.
40IMX7
330
μ H, 0.6 A, 0.42
Ω
68
μF, 100 V
n.a.
48IMS7
330
μ H, 0.6 A, 0.42
Ω
68
μF, 100 V
n.a.
70IMX7
1000
μ H, 0.6 A, 0.42
Ω
68
μF, 100 V
n.a.
110IMX7
330
μH, 0.2 A
200
μF, 200 V
n.a.
Note: 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.
Fig. 4
Example for external circuitry to comply with IEC/EN
61000-4-5, level 2 (transzorb D only for 20IMX7).
Vi+
Vi–
07064
C
L
D
+
i
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