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SQ60120QPA28PK2 Datasheet(PDF) 9 Page - SynQor Worldwide Headquarters |
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SQ60120QPA28PK2 Datasheet(HTML) 9 Page - SynQor Worldwide Headquarters |
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9 / 12 page  Product # SQ60120QPA28 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2SQ612J Rev. B 06/17/09 Page 9 Input: Output: Current: Package: 36-75 V 12 V 28 A Quarter-brick Technical Specification Applications Section BASIC OPERATION AND FEATURES With voltages dropping and currents rising, the economics of an Intermediate Bus Architecture (IBA) are becoming more attractive, especially in systems requiring multiple low voltages. IBA systems separate the role of isolation and voltage scaling from regulation and sensing. The BusQor series bus converter provides isolation and a coarse voltage step down in one compact module, leaving regulation to simpler, less expensive non-isolated converters. In Figure A below, the BusQor module provides the isolation stage of the IBA system. The isolated bus then distributes power to the non-isolated buck regulators to generate the required voltage lev- els at the point of load. In this case, the bucks are represented with SynQor’s NiQor series of non-isolated dc-dc converters. In many applications requiring multiple low voltage outputs, signifi- cant savings can be achieved in board space and overall system costs. When designing an IBA system with bus converters, the designer can select from a variety of bus voltages. While there is no univer- sally ideal bus voltage, most designs employ one of the following: 12V, 9V, 7.5V, 5V, or 3.3V. Higher bus voltages can lead to lower efficiency for the buck regulators but are more efficient for the bus converter and provide lower board level distribution cur- rent. Lower bus voltages offer the opposite trade offs. SynQor’s SQ BusQor modules accept the full 48/60V telecom bus voltage and have a narrow output voltage range compatible with many non-isolated point of load converters. When used in IBA systems, the output variation of the BusQor must be in accor- dance with the input voltage range of the non-isolated converters being employed. 3.3 V 2.5 V 48Vdc 42-53V 1.8 V 1.5 V 0.9 V Loads Typical User Board 48Vdc Front End Figure A: Example of Intermediate Bus Architecture using BusQor bus converter and NiQor non-isolated converters CONTROLFEATURES REMOTE ON/OFF (Pin 2 ): The ON/OFF input, Pin 2, permits the user to control when the converter is on or off. This input is referenced to the return terminal of the input bus, Vin(-). There are two versions of the converter that differ by the sense of the logic used for the ON/OFF input. In the positive logic version, the ON/OFF input is active high (meaning that a high turns the converter on). In the negative logic version, the ON/OFF signal is active low (meaning that a low turns the converter on). Figure B is a detailed look of the internal ON/OFF circuitry. Vin+ +5V 5V 124k On/Off 49.9k TTL 100k Vin- Figure B: Internal ON/OFF pin circuitry PROTECTIONFEATURES Input Under-Voltage Lockout : The converter is designed to turn off when the input voltage is too low, helping avoid an input system instability problem, described in more detail in the application note titled “Input System Instability” available on the SynQor website. The lockout circuitry is a comparator with DC 12Vdc BusQor Converter hysteresis. When the input voltage is rising, it must exceed the typical Turn-On Voltage Threshold value (listed on the specifica- tion page) before the converter will turn on. Once the converter is on, the input voltage must fall below the typical Turn-Off Voltage Threshold value before the converter will turn off. Also see Figure E. NiQor Converters Output Current Limit : The output of the BusQor module is electronically protected against output overloads. When an overload current greater than the “DC Current-Limit Inception” specification is drawn from the output, the output of the BusQor will shutdown to zero volts after the 1 ms have elapsed (see Figure C). The shutdown period lasts for a typical period of 200 ms (Figure D) after which the BusQor tries to power up again. If the overload persists, the output voltage will go through Applications Section |
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