Datasheet

Board Layout

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The input decoupling capacitor C4 and bootstrap capacitor C5 are both located as close to the IC as

possible. Additionally, the voltage set-point resistor divider components are kept close to the IC. The

location of the connection to the voltage divider network at R5 defines the point of regulation, which is the

copper VOUT trace at the output connector J3. For the TPS54020, an additional input bulk capacitor is

included to effectively reduce the source impedance from the input supply to the switcher. Critical analog

circuits such as the voltage setpoint divider, frequency set resistor, slow-start capacitor, and compensation

components are terminated to analog ground (AGND) using a ground trace that is separate from the

power ground plane.

Figure 12. TPS54020EVM-082 Top Side Copper

TPS54020EVM-082 Evaluation Module (PWR082) SLVU777–September 2012

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