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FW300A1 Fiches technique(PDF) 10 Page - Lineage Power Corporation |
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FW300A1 Fiches technique(HTML) 10 Page - Lineage Power Corporation |
10 / 20 page 10 10 Lineage Power Data Sheet April 2008 dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 250 W to 300 W FW250A1 and FW300A1 Power Modules: Safety Considerations For safety-agency approval of the system in which the power module is used, the power module must be installed in compliance with the spacing and separation requirements of the end-use safety agency standard, i.e., UL1950, CSA C22.2 No. 950-95, and VDE 0805 (EN60950, IEC950). If the input source is non-SELV (ELV or a hazardous voltage greater than 60 Vdc and less than or equal to 75 Vdc), for the module’s output to be considered meet- ing the requirements of safety extra-low voltage (SELV), all of the following must be true: s The input source is to be provided with reinforced insulation from any hazardous voltages, including the ac mains. s One VI pin and one VO pin are to be grounded or both the input and output pins are to be kept floating. s The input pins of the module are not operator acces- sible. s Another SELV reliability test is conducted on the whole system, as required by the safety agencies, on the combination of supply source and the subject module to verify that under a single fault, hazardous voltages do not appear at the module’s output. Note: Do not ground either of the input pins of the module without grounding one of the output pins. This may allow a non-SELV voltage to appear between the output pin and ground. The power module has extra-low voltage (ELV) outputs when all inputs are ELV. The input to these units is to be provided with a maxi- mum 20 A normal-blow fuse in the ungrounded lead. Feature Descriptions Overcurrent Protection To provide protection in a fault (output overload) condi- tion, the unit is equipped with internal current-limiting circuitry and can endure current limiting for an unlim- ited duration. At the point of current-limit inception, the unit shifts from voltage control to current control. If the output voltage is pulled very low during a severe fault, the current-limit circuit can exhibit either foldback or tailout characteristics (output-current decrease or increase). The unit operates normally once the output current is brought back into its specified range. Remote On/Off To turn the power module on and off, the user must supply a switch to control the voltage between the on/off terminal and the VI(–) terminal (Von/off). The switch can be an open collector or equivalent (see Figure 17). A logic low is Von/off = 0 V to 1.2 V, during which the module is on. The maximum Ion/off during a logic low is 1 mA. The switch should maintain a logic-low voltage while sinking 1 mA. During a logic high, the maximum Von/off generated by the power module is 15 V. The maximum allowable leakage current of the switch at Von/off = 15 V is 50 µA. If not using the remote on/off feature, short the ON/OFF pin to VI(–). 8-580 (C).d Figure 17. Remote On/Off Implementation Remote Sense Remote sense minimizes the effects of distribution losses by regulating the voltage at the remote-sense connections. The voltage between the remote-sense pins and the output terminals must not exceed the out- put voltage sense range given in the Feature Specifica- tions table, i.e.: [VO(+) – VO(–)] – [SENSE(+) – SENSE(–)] ≤ 0.7 V The voltage between the VO(+) and VO(–) terminals must not exceed the minimum value indicated in the output overvoltage shutdown section of the Feature Specifications table. This limit includes any increase in voltage due to remote-sense compensation and output voltage set-point adjustment (trim), see Figure 18. If not using the remote-sense feature to regulate the out- put at the point of load, connect SENSE(+) to VO(+) and SENSE(–) to VO(–) at the module. + Ion/off – Von/off CASE ON/OFF VI(+) VI(–) SENSE(+) SENSE(–) VO(+) VO(–) |
Numéro de pièce similaire - FW300A1 |
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Description similaire - FW300A1 |
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