TPS54231
SLUS851–OCTOBER 2008.............................................................................................................................................................................................. www.ti.com
OUTPUT
FILTER
CAPACITOR
Vout
TOPSIDE
GROUND
AREA
Feedback Trace
Route BOOT CAPACITOR
trace on other layer to provide
wide path for topside ground
OUTPUT
INDUCTOR
CATCH
DIODE
PH
INPUT
BYPASS
CAPACITOR
BOOT
CAPACITOR
PH
BOOT
VIN
EN
GND
COMP
Vin
UVLO
RESISTOR
DIVIDER
SS
VSENSE
RESISTOR
DIVIDER
COMPENSATION
NETWORK
SLOW START
CAPACITOR
Signal VIA
Thermal VIA
Figure 14. TPS54231 Board Layout
Estimated Circuit Area
The estimated printed circuit board area for the components used in the design of Figure 13is 0.68 in2. This area
does not include test point or connectors.
ELECTROMAGNETIC INTERFERENCE (EMI) CONSIDERATIONS
As EMI becomes a rising concern in more and more applications, the internal design of the TPS54231 takes
measures to reduce the EMI. The high-side MOSFET gate drive is designed to reduce the PH pin voltage
ringing. The internal IC rails are isolated to decrease the noise sensitivity. A package bond wire scheme is used
to lower the parasitics effects.
To achieve the best EMI performance, external component selection and board layout are equally important.
Follow the Step by Step Design Procedure above to prevent potential EMI issues.
18
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