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EBDW025A0B Datasheet(PDF) 10 Page - Lineage Power Corporation |
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EBDW025A0B Datasheet(HTML) 10 Page - Lineage Power Corporation |
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10 / 32 page  GE Data Sheet EBDW025A0B Barracuda™ Series; DC-DC Converter Power Modules 36-75Vdc Input; 12.0Vdc, 25.0A, 300W Output April 15, 2013 ©2012 General Electric Company. All rights reserved. Page 10 Feature Descriptions (continued) Load Sharing For higher power requirements, the EBDW025A0 power module offers an optional feature for parallel operation (-P Option code). This feature provides a precise forced output voltage load regulation droop characteristic. The output set point and droop slope are factory calibrated to insure optimum matching of multiple modules’ load regulation characteristics. To implement load sharing, the following requirements should be followed: The VOUT(+) and VOUT(-) pins of all parallel modules must be connected together. Balance the trace resistance for each module’s path to the output power planes, to insure best load sharing and operating temperature balance. VIN must remain between 40Vdc and 75Vdc for droop sharing to be functional. It is permissible to use a common Remote On/Off signal to start all modules in parallel. These modules contain means to block reverse current flow upon start-up, when output voltage is present from other parallel modules, thus eliminating the requirement for external output ORing devices. Modules with the –P option will self determine the presence of voltage on the output from other operating modules, and automatically increase its Turn On delay, Tdelay, as specified in the Feature Specifications Table. When parallel modules startup into a pre-biased output, e.g. partially discharged output capacitance, the Trise is automatically increased, as specified in the Feature Specifications Table, to insure graceful startup. Insure that the load is <50% IO,MAX (for a single module) until all parallel modules have started (load full start > module Tdelay time max + Trise time). If fault tolerance is desired in parallel applications, output ORing devices should be used to prevent a single module failure from collapsing the load bus. Remote Sense Remote sense minimizes the effects of distribution losses by regulating the voltage at the remote-sense connections (See Figure 15). The SENSE(-) pin should be always connected to VO(–).The voltage between the remote-sense pins and the output terminals must not exceed the output voltage sense range given in the Feature Specifications table: [VO(+) – VO(–)] – [SENSE(+) ] 0.5 V 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. 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 (Maximum rated power = Vo,set x Io,max). Figure 16. Circuit Configuration for remote sense. Configurable Control Pins The EBDW025A0B contains two configurable control pins, T/C1 and C2, referenced to the module secondary SIG_GND. See Mechanical Views for pin locations. The following table list the default factory configurations for the functions assigned to these pins. Additional configurations can be accomplished via the PMBus command, MFR_CPIN_ARA_CONFIG. Following the table, there is a feature description for each function. Pin Designation/Function Module Configuration T/C1 C2 Code On/Off (O) Power Good w/o -P Factory Default Trim On/Off (O) w/o -P Via PMBus Trim Power Good w/o -P Via PMBus On/Off (O) Power Good with -P Factory Default Remote On/Off(o) The module contains an additional remote on/off control input On/Off(o), via either the T/C1 or C2 pin, reference to the SIG_GND pin. The factory default configuration is set to ignore this input, unless activated by the PMBus command, MFR_ CPIN_ON_OFF_CONFIG. This command is also used to configure the logic for the On/Off(o) pin. Positive logic remote on/off turns the module on during a logic HI voltage on the ON/OFF pin, and off during a logic LO. Negative logic remote on/off turns the module off during a logic HI, and on during a logic LO. The On/Off(o) circuit is powered from an internal bias supply, referenced to SIG_GND. To turn the power module on and off, the user must supply a switch to control the voltage between the On/Off (o) terminal and the SIG_GND pin (Von/off(o)). The switch can be an open collector or equivalent (see Figure 13). A logic LO is Von/off(o) = -0.3V to 0.8V. The typical Ion/off(o) during a logic low is 330µA. The switch should maintain a logic LO voltage while sinking 250µA. During a logic HI, the maximum Von/off(o) generated by the power module is 3.3V. The maximum allowable leakage current of the switch at Von/off(o) = 2.0V is 130µA. If using an external voltage source, the maximum voltage Von/off on the pin is 3.3V with respect to the Vi(-) terminal. If not using the Remote On/Off(o) feature, the pin may be left N/C. |
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