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CC-M Datasheet(PDF) 11 Page - General Semiconductor |
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CC-M Datasheet(HTML) 11 Page - General Semiconductor |
11 / 20 page Lineage Power 11 Data Sheet April 2008 36 Vdc to 75 Vdc Input; Dual Outputs; 25 W DW025 Dual Output-Series Power Modules: dc-dc Converters; Design Considerations (continued) 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., UL-1950, CSA 22.2-950, EN60950. For the converter output to be considered to be meet- ing the requirements of safety extra-low voltage (SELV), one of the following must be true: s All inputs are SELV and floating with the output also floating. s All inputs are SELV and grounded with the output also grounded. s Any non-SELV input must be provided with rein- forced insulation from any other hazardous voltages, including the ac mains, and must have a SELV reli- ability test performed on it in combination with the converters. If the input meets extra-low voltage (ELV) require- ments, then the converter’s output is considered ELV. The input to these units is to be provided with a maxi- mum 5 A normal-blow fuse in the ungrounded lead. Input/Output Voltage Reversal CAUTION: Applying a reverse voltage across the module input or output forward biases an internal diode. Attempting to start the module under this condition can damage the module. Feature Descriptions Output Overvoltage Clamp The output overvoltage clamp consists of control circuitry, independent of the primary regulation loop, that monitors the voltage on the output terminals. The control loop of the clamp has a higher voltage set point than the primary loop (see Feature Specifications table). This provides a redundant voltage control that reduces the risk of output overvoltage. Current Limit 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 unlimited duration. At the point of current-limit inception, the unit shifts from voltage control to current control. If the out- put 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 Two remote on/off options are available. Positive logic remote on/off turns the module on during a logic high voltage on the remote on/off pin, and off during a logic low. Negative logic remote on/off, code suffix “1,” turns the module off during a logic high and on during a logic low. 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 14). A logic low is Von/off = 0 V to 1.2 V. 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 10 V. The maximum allowable leakage current of the switch at Von/off = 10 V is 50 µA. 8-754(C) Figure 14. Remote On/Off Implementation COM LOAD + Ion/off – Von/off ON/OFF VI(+) VI(–) VO2 LOAD VO1 |
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