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SG1577A layout guidelines

Posted: 23 Feb 2010     Print Version  Bookmark and Share

Keywords:SG1577A layout  switching converter  PCB guidelines 

This layout is important in high-frequency switching converter design. If designed improperly, PCB can radiate excessive noise and contribute to converter instability.

Place the pulse-width modulated (PWM) power stage components first. Mount all the power components and connections in the top layer with wide copper areas. The switchers of buck, inductor and output capacitor should be as close to each other as possible to reduce the radiation of EMI due to the high-frequency current loop. If the output capacitors are placed in parallel to reduce the ESR of capacitor, equal sharing ripple current should be considered. Place the input capacitor near the drain of high-side MOSFET. In multi-layer PCB, use one layer as power ground and have a separate control signal ground as the reference for all signals. To avoid the signal ground being affected by noise and have best load regulation, it should be connected to the ground terminal of output.

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