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SQ60120QPB33xyz-G Datasheet(PDF) 10 Page - SynQor Worldwide Headquarters |
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SQ60120QPB33xyz-G Datasheet(HTML) 10 Page - SynQor Worldwide Headquarters |
10 / 14 page Product # SQ60120QPB33 Phone 1-888-567-9596 www.synqor.com Doc.# 005-0005266 Rev. G 05/13/15 Page 10 Technical Specification SQ60120QPB33 Application Section Application 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 levels 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, significant 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 universally 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 current. 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 accordance with the input voltage range of the non-isolated converters being employed. BusQor Converter NiQor Converters Loads 48Vdc Front End Typical User Board 3.3V CONTROL FEATURES 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. TTL ON/OFF Vin(_) Vin(+) 2.5V 1.8V 1.5V 0.9V 12Vdc 48Vdc 36-75V Figure A: Example of Intermediate Bus Architecture using BusQor bus converter and NiQor non-isolated converters 5V +5V 124k 49.9k 100k Figure B: Internal ON/OFF pin circuitry |
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