48ims7-24-24-9 Power-One, 48ims7-24-24-9 Datasheet - Page 6

• Manufacturer Part Number: 48ims7-24-24-9
• Description: Imx7/ Ims7 Dc-dc Series Data Sheet 7-watt Dc-dc Converters
• Manufacturer: Power-One

BCD20007 Rev AB
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:
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.
Table 3: Built-in transient voltage suppressor
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
Model
20IMX7
24IMS7
40IMX7
48IMS7
70IMX7
110IMX7
1
2
Model
20IMX7
24IMS7
40IMX7
48IMS7
70IMX7
110IMX7
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.
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.
1
2
2
2
2
2
L
1000 µ H, 0.6 A, 0.42
330 µ H, 0.6 A, 0.42
330 µ H, 0.6 A, 0.42
330 µ H, 0.6 A, 0.42
330 µ H, 1 A, 0.115
C
330 µ H, 0.2 A
Breakdown
+
Voltage
V
100 V
100 V
144 V
167 V
BR nom
53 V
®
L
overvoltage lockout at approx. 38 V
D
Peak Power
Vi+
Vi–
at 1 ms
1500 W
i
600 W
600 W
600 W
600 W
200 µF, 200 V
68 µF, 100 V
68 µF, 100 V
68 µF, 100 V
P
68 µF, 63 V
68 µF, 63 V
P
C
07064
Peak Pulse
Current
1.5KE39A
7.7 A
4.1 A
2.9 A
2.5 A
11 A
I
PP
n.a.
n.a.
n.a.
n.a.
n.a.
D
Page 6 of 15
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:
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 V
ETS 300132-2 (40IMX7).
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.
– For 20IMX7 and 24IMS7 a fast 2 A (F2A) fuse
– For 40IMX7 and 48IMS7 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.
IMX7/IMS7 DC-DC Series Data Sheet
2
0
4
3
1
A
0
20
7-Watt DC-DC Converters
i nom
40
, P
o nom
measured according to
60
www.power-one.com
04030a
80 µs