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BQ50120QTA20NYC Datasheet(PDF) 11 Page - SynQor Worldwide Headquarters |
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BQ50120QTA20NYC Datasheet(HTML) 11 Page - SynQor Worldwide Headquarters |
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11 / 12 page  Product # BQ50120QTA20 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2BQ512J Rev. E 03/17/06 Page 11 Input: Input: Output: Output: Current: Current: PPackage: ackage: 42-53 V 42-53 V 12 V 12 V 20 A 20 A Quarter-brick Quarter-brick T Technical S echnical Specification pecification The number 800 is a “Load Current Scale Factor” for this prod- uct, valid only for Vin = 48V. Hence, measurement should be made at this input voltage. The voltage drop across the sense resistor is about 25mV at full load of 20A. Therefore, proper measuring techniques must be used to ensure accuracy. A calibrated DMM set to 300mV is acceptable. Since this measurement is done on the Primary area of the converter, a slight non-linearity may be observed over the load current range. Using the Scale Factor referenced above, the error may be on the order of 4%. For more detailed information consult the application note on SynQor’s website titled “Output Load Current Calculations”. Current Sharing: BusQor modules are designed to operate in parallel without the use of any external current share circuitry. A typical circuit for paralleling two BusQor modules is shown in Figure H. An output capacitor is recommended across each mod- ule and located close to the converter for optimum filtering and noise control performance. Dedicated input inductors are rec- ommended but are considered optional. Input capacitors must be located close to the converter module. PCB layout in the input circuit should be such that high frequency ripple currents of each module is restricted to a loop formed by the input capacitors and the input terminals of the BusQor module. See Figure K for details on PCB layout. Contact SynQor application engineering for further assistance on PCB trace design. The current share performance of two paralleled modules is illus- trated in the graph in Figure J. In this graph the percent devia- tion from ideal sharing (50%) is plotted for each module versus the total output load current at 48Vin. Figure H: BusQor Output Paralleling for increased current output. BusQor module (N logic option) Vin 12Vout 40A 1 2 3 1 2 3 5 4 5 4 BusQor module (N logic option) Figure J: Current share performance of 2 paralleled modules Figure K: Recommended PCB layout for input circuit -8% -6% -4% -2% 0% 2% 4% 6% 8% 10% 5 10 15 20 25 30 35 40 Total Load Current (A) Module 1 Module 2 48Vin CM EMI filter Bulk Cap Input LC filters BusQor module BusQor module (Not shown in Figure H) Figure G: Location of Sense Resistors |
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