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20IMX15-05-8RG-G Datasheet(PDF) 11 Page - Bel Fuse Inc. |
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20IMX15-05-8RG-G Datasheet(HTML) 11 Page - Bel Fuse Inc. |
11 / 19 page IMX15, IMY15 , IMS15 Series Data Sheet 15 Watt DC-DC Converters BCD20008-G Rev AE, 25-Aug-2017 Page 11 of 19 MELCHER The Power Partners. Thermal Considerations If a converter, mounted on a PCB, is located in free, quasi- stationary air (convection cooling) at the indicated maximum ambient temperature TA max (see table Temperature specifications) and is operated at its nominal input voltage and output power, the case temperature measured at the measuring point of case temperature TC (see Mechanical Data) will approach the indicated value TC max after the warm- up phase. However, the relationship between TA and TC depends heavily on the conditions of operation and integration into a system. The thermal conditions are influenced by input voltage, output current, airflow, temperature of surrounding components and surfaces, and the properties of the printed circuit board. TA max is therefore only an indicative value. Caution: The case temperature TC measured at the measuring point of case temperature TC (see Mechanical Data) may under no circumstances exceed the specified maximum value. The installer must ensure that under all operating conditions TC remains within the limits stated in the table Temperature specifications. Overtemperature Protection The converters are protected from possible overheating by means of an internal temperature monitoring circuit. It shuts down the converter above the internal temperature limit, and attempts to automatically restart in short intervals. This feature helps protect against excessive internal temperatures, which could occur during heavy overload conditions. Output Overvoltage Protection The output of single-output models as well as -0503- and -05- 05-models are protected against overvoltage by a second control loop. In the event of an overvoltage on one of the outputs, the converter will shut down and attempt to restart in short intervals. Doubel-output models (except -0503- and -05-05-models) are protected against overvoltage by a Zener diode across the second output. Under worst case conditions the Zener diode will become a short circuit. Since with double-output models both outputs track each other, the protection diode is only provided in one of the outputs. The main purpose of this feature is to protect against possible overvoltage, which could occur due to a failure in the control logic. This protection circuit is not designed to withstand externally applied overvoltages. Fig. 9 Vo versus Io (typ) of converters with Vo = 5.1 V (110IMY15-05-8R) 5.5 5.0 4.5 4.0 3.5 3.0 00.4 0.8 1.2 1.6 2.0 2.4 2.8 3.2 3.6 4 A V 05166a Fig. 8 Overload switch-off (hiccup mode); typical values 1.0 0.8 0.6 0.4 0 0.2 20 40 60 80 100 °C P o /Po max JM017 T A 0.5 m/s = 100 LFM natural cooling Short Circuit Behavior The current limit characteristic shuts down the converter, whenever a short circuit is applied to its output. It acts self- protecting, and automatically recovers after removal of the overload condition (hiccup mode). Parallel and Series Connection The outputs of one or several single- or double-output models Fig. 7 Maximum output power versus ambient temperature can be connected in series without any precautions, taking into consideration that the highest output voltage should remain below 42 V to ensure that the output remains SELV. Both outputs of the same converter with equal voltage (e.g. 5 V / 5 V) can be connected in parallel and will share their output currents equally. Parallel operation of single or double outputs of two or more converters with the same output voltage may cause start-up problems at initial start-up. This is only advisable in applications, where one converter is able to deliver the full load current as, for example, required in true redundant systems. Note: If the 2nd output of double-output models (except 0503) is not used, connect it in parallel to the 1st output. Typical Performance Curves General conditions: – TA = 25 ºC, unless TC is specified. – Shutdown pin left open-circuit. – Trim or R input not connected. 70 100 V o [%] t 05041c 0.3 s overload condition switch-off 0 |
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