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FW300B1 bảng dữ liệu(PDF) 9 Page - Lineage Power Corporation |
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FW300B1 bảng dữ liệu(HTML) 9 Page - Lineage Power Corporation |
9 / 20 page Lineage Power 9 Data Sheet April 2008 36 Vdc to 75 Vdc Input, 12 Vdc Output; 250 W to 300 W FW250B1 and FW300B1 Power Modules: dc-dc Converters: 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 11). 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 11. 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(–)] ≤ 1.2 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 12. 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. Although the output voltage can be increased by both the remote sense and by the trim, the maximum increase for the output voltage is not the sum of both. The maximum increase is the larger of either the remote sense or the trim. Consult the factory if you need to increase the output voltage more than the above limitation. The amount of power delivered by the module is defined as the voltage at the output terminals multiplied by the output current. When using remote sense and trim, the output voltage of the module can be increased, which at the same output current would increase the power output of the module. Care should be taken to ensure that the maximum output power of the module remains at or below the maximum rated power. 8-651 (C).e Figure 12. Effective Circuit Configuration for Single-Module Remote-Sense Operation + Ion/off – Von/off CASE ON/OFF VI(+) VI(–) SENSE(+) SENSE(–) VO(+) VO(–) VO(+) SENSE(+) SENSE(–) VO(–) VI(+) VI(–) IO LOAD CONTACT AND DISTRIBUTION LOSSES SUPPLY II CONTACT RESISTANCE |
Số phần tương tự - FW300B1 |
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Mô tả tương tự - FW300B1 |
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