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LS5660-7R 数据表(PDF) 9 Page - Power-One |
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LS5660-7R 数据表(HTML) 9 Page - Power-One |
9 / 27 page Cassette Style 100 Watt AC-DC Converters S Series PFC Edition 01/01.2001 9/27 Output Voltage Regulation of Double Output Modules Output 1 is under normal conditions regulated to Uo1 nom, independent of the output currents. Uo2 is dependent upon the load distribution. If both outputs are loaded with more than 10% of Io nom, the deviation of Uo2 remains within ±5% of the value of U o1. The following 3 figures show the regulation with varying load distribution. If Io1 = Io2 or the two outputs are connected in series, the de- viation of Uo2 remains within ±1% of the value of U o1 pro- vided that a total load of more than 10% of Io nom is applied. Two outputs of a single S 5000 module connected in paral- lel will behave like the output of a S 4000 module; the paral- leled output is fully regulated. No precautions are neces- sary in using the R-input and the test sockets. Uo Uo nom 0.98 0.5 0 0.5 1.0 Io1 IoL Io Io nom 05001 Fig. 9 Uo1 vs. Io1 (typ.) of single output units Thermal Considerations If a converter is located in free, quasi-stationary air (con- vection cooling) at the indicated maximum ambient tem- perature TA max (see table: Temperature specifications) and is operated at its nominal input voltage and output power, the 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 and temperature of surrounding compo- nents and surfaces. TA max is therefore, contrary to TC max, an indicative value only. Caution: The installer must ensure that under all operat- ing conditions TC remains within the limits stated in the table: Temperature specifications. Notes: Sufficient forced cooling or an additional heat sink allows TA to be higher than 71 °C (e.g. 85°C) if T C max is not exceeded. For -7 or -9 units at an ambient temperature TA of 85 °C with only convection cooling, the maximum permissible current for each output is approx. 40% of its nominal value as per figure. 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 50 60 70 80 90 100 Io/Io nom TA [°C] 0.9 1.0 Forced cooling TA min TC max Convection cooling Fig. 8 Output current derating versus temperature for -7 and -9 units. Thermal Protection A temperature sensor generates an internal inhibit signal which disables the outputs if the case temperature exceeds TC max. The outputs are automatically re-enabled if the tem- perature drops below this limit. It is recommended that continuous operation under simul- taneous extreme worst case conditions of the following three parameters be avoided: Minimum input voltage, maximum output power and maximum temperature. Output Protection Each output is protected against overvoltage which could occur due to a failure of the control circuit by means of a voltage suppressor diode which, under worst case condi- tions, may become a short circuit. The suppressor diodes are not designed to withstand externally applied over- voltages. Overload at any of the two outputs will cause a shut-down of both outputs. A red LED indicates the over- load condition. Parallel or Series Connection of Units Single or double output units with equal nominal output volt- age can be connected in parallel without any precautions using option T. With option T (current sharing), all units share the current approximately equally. Single output units and/or main and second outputs of dou- ble output units can be connected in series with any other (similar) output. Note: – Parallel connection of double output units should always include both, main and second output to maintain good regulation of both outputs. – Not more than 5 units should be connected in parallel. – Series connection of second outputs without involving their main outputs should be avoided as regulation may be poor. – The maximum output current is limited by the output with the lowest current limitation if several outputs are con- nected in series. Output Voltage Regulation of Single or Double Output Modules with Outputs 1 and 2 Connected in Series |
类似零件编号 - LS5660-7R |
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类似说明 - LS5660-7R |
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