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24IMS7-05-05-9 Datasheet(PDF) 6 Page - Power-One |
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24IMS7-05-05-9 Datasheet(HTML) 6 Page - Power-One |
6 / 15 page ® 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 µs 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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