Slide 1 Slide 2 Slide 3 Slide 4 Slide 5 Slide 6 Slide 7 Slide 8 Slide 9 Slide 10 Slide 11 Slide 12 Slide 13 Slide 14 Slide 15 Slide 16 Slide 17 Slide 18 Slide 19 Slide 20 Slide 21 Product List
Understanding SWIFT Step-Down DC-DC Converters Slide 14

SWIFT devices are available in single and dual outputs, and each has it’s own merits. When considering a dual converter, make sure that the distance to each load is close, otherwise PCB trace loss can affect the accuracy of the voltage and improper placement of the output capacitors can affect stability of the power supply. Also, two converters in one package will dissipate more heat, so make sure there is enough copper on the PCB or airflow to keep the increased temperature in check. On the other hand, when considering 2 singles, it may be better to use a dual converter. If the converters are switched 180 degrees out of phase, the input current ripple will be allowing less capacitance and there will be board space savings. The top input current waveforms show that 2 capacitors will be needed when 2 converters are switched in phase. The lower waveform shows a lower peak current that one capacitor can handle.

PTM Published on: 2011-11-10