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D-M Scheda tecnica(PDF) 11 Page - General Semiconductor |
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D-M Scheda tecnica(HTML) 11 Page - General Semiconductor |
11 / 20 page Data Sheet JC030-Series Power Modules: March 26, 2008 18 Vdc to 36 Vdc Inputs; 2 Vdc to 15 Vdc Outputs;13 W to 30 W Lineage Power 11 Design Considerations Grounding Considerations The power module has an isolated case ground pin. The case is not connected internally allowing the user flexibility in grounding. Input Source Impedance The power module should be connected to a low ac- impedance input source. Highly inductive source impedances can affect the stability of the power mod- ule. A 33 µF electrolytic capacitor (ESR < 0.7 ¾ at 100 kHz) mounted close to the power module helps ensure stability of the unit. 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 C22.2 No. 950-95, and VDE 0805 (EN60950, IEC950). For the converter output to be considered meeting the requirements of safety extra-low voltage (SELV), the input must meet SELV requirements. 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 5 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 tai- lout 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, device code suffix “1,” turns the module off during a logic high and on during a logic low. Standard modules provide posi- tive logic 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 22). A logic low is Von/off = –0.7 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 6 V. The maximum allowable leak- age current of the switch at Von/off = 6 V is 50 µA. The module has internal capacitance to reduce noise at the ON/OFF pin. Additional capacitance is not gen- erally needed and may degrade the start-up character- istics of the module. CAUTION: To avoid damaging the power module or external on/off circuit, the connection between the VI(–) pin and the input source must be made before or simulta- neously to making a connection between the ON/OFF pin and the input source (either directly or through the external on/off circuit.) 8-720(C).h Figure 22. Remote On/Off Implementation + Ion/off – Von/off REMOTE ON/OFF VI(+) VI(-) SENSE(+) SENSE(–) VO(+) VO(–) LOAD |
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