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PQ24018QGX25 Datasheet(PDF) 10 Page - SynQor Worldwide Headquarters |
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PQ24018QGX25 Datasheet(HTML) 10 Page - SynQor Worldwide Headquarters |
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10 / 16 page  Product # PQ24018QGx25 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2QG218D Rev. B 04/09/13 Page 10 Input: Output: Current: Package: 18 - 36V 1.8V 25A Quarter-brick Application Section Application Section BASIC OPERATION AND FEATURES The PowerQor series converter uses a two-stage power cir- cuit topology. The first stage is a buck-converter that keeps the output voltage constant over variations in line, load, and temperature. The second stage uses a transformer to provide the functions of input/output isolation and voltage step- down to achieve the low output voltage required. Both the first stage and the second stage switch at a fixed frequency for predictable EMI performance. Rectification of the transformer’s output is accomplished with synchronous rectifiers. These devices, which are MOSFETs with a very low on-state resistance, dissipate far less energy than Schottky diodes used in conventional dc/dc converters. This is the primary reason that the PowerQor converter has such high efficiency—even at very low output voltages and very high output currents. Dissipation throughout the converter is so low that the PowerQor converter requires no heatsink to deliver a greater level of power than can be delivered by a con- ventional, Schottky-diode-based dc/dc converter with a 0.5” high heatsink. At equivalent ambient air temperature, airflow rate, and output power level, the hottest semicon- ductor junction temperature and the hottest PCB temperature within the PowerQor converter are cooler than those found in conventional dc/dc converters with a 0.5” high heatsink attached. Since a heatsink is not required, the PowerQor converter does not need a metal baseplate or potting material to help conduct the dissipated energy to the heatsink. The PowerQor converter can thus be built more simply using high yield surface mount techniques on a PCB substrate. Unlike conventional dc/dc converters, which have critical thermal connections between the power components and the baseplate, and between the baseplate and the heatsink, the PowerQor converter has no explicit, failure-prone thermal connections. Compared to a conventional Schottky-diode-based dc/dc converter with a 0.5” high heatsink, the PowerQor convert- er is more efficient and therefore it dissipates less than half the energy. Additionally, because the PowerQor converter is thinner (0.4” vs. 1.0”), the board-to-board pitch in a rack can be much smaller, and cooling airflow is less impeded by the converter. Because the PowerQor converter is much lighter, vibration and shock-induced problems are greatly reduced. Moreover, due to the lack of failure-prone explicit thermal connections and the lack of potting material the PowerQor converter is more reliable than conventional dc/dc converters. The PowerQor series converter uses the industry standard pin-out configuration used by other vendors of comparably sized and rated dc/dc converters. The unit is pin for pin compatible with the Lucent QW series. The PowerQor converter has many standard control and protection features. All shutdown features are non-latching, meaning that the converter shuts off for 200ms before restarting. (see Figure F) • An ON/OFF input permits the user to control when the converter is on and off in order to properly sequence dif- ferent power supplies and to reduce power consumption during a standby condition. • Remote sense inputs permit the user to maintain an accurate voltage at the load despite distribution voltage drops between the converter’s output and the load. • An output voltage trim input permits the user to trim the output voltage up or down to achieve a custom volt- age level or to do voltage margining. • An input under-voltage lockout avoids input system instability problems while the input voltage is rising. • The output current limit protects both the converter and the board on which it is mounted against a short cir- cuit condition. (see Figure 18) • An output over-voltage limit circuit shuts the unit down if the output voltage at the output pins gets too high. • A sensor located in a central spot of the PCB provides a PCB temperature limit. If, due to an abnormal con- dition, this spot gets too hot, the converter will turn off. Once the converter has cooled, it will automatically turn on again without the need to recycle the input power. CONTROL PIN DESCRIPTIONS Pin 2 (ON/OFF): The ON/OFF input, Pin 2, permits the user to control when the converter is on or off. This input is |
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