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TPS54315PWPR Datasheet(PDF) 9 Page - Texas Instruments |
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TPS54315PWPR Datasheet(HTML) 9 Page - Texas Instruments |
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9 / 22 page  TPS54311, TPS54312 TPS54313, TPS54314 TPS54315, TPS54316 SLVS416B − FEBRUARY 2002 − REVISED APRIL 2005 www.ti.com 9 that should tie directly to the power ground plane are the input capacitors, the output capacitors, the input voltage decoupling capacitor, and the PGND pins of the TPS54311−16. Use a separate wide trace for the analog ground signal path. This analog ground should be used for the timing resistor RT, slow-start capacitor and bias capacitor grounds. Connect this trace directly to AGND (pin 1). The PH pins should be tied together and routed to the output inductor. Since the PH connection is the switching node, inductor should be located very close to the PH pins and the area of the PCB conductor minimized to prevent excessive capacitive coupling. Connect the boot capacitor between the phase node and the BOOT pin as shown. Keep the boot capacitor close to the IC and minimize the conductor trace lengths. Connect the output filter capacitor(s) as shown between the VOUT trace and PGND. It is important to keep the loop formed by the PH pins, Lout, Cout and PGND as small as practical. Connect the output of the circuit directly to the VSENSE pin. Do not place this trace too close to the PH trace. Do to the size of the IC package and the device pinout, they will have to be routed somewhat close, but maintain as much separation as possible while still keeping the layout compact. Connect the bias capacitor from the VBIAS pin to analog ground using the isolated analog ground trace. If a slow-start capacitor or RT resistor is used, or if the SYNC pin is used to select 350-kHz operating frequency, connect them to this trace as well. AGND BOOT VSENSE NC PWRGD PH PH PH PH PH RT FSEL SS/ENA VBIAS VIN VIN VIN PGND PGND PGND VOUT PH Vin TOPSIDE GROUND AREA VIA to Ground Plane ANALOG GROUND TRACE EXPOSED POWERPAD AREA OUTPUT INDUCTOR OUTPUT FILTER CAPACITOR BOOT CAPACITOR INPUT BYPASS CAPACITOR INPUT BULK FILTER FREQUENCY SET RESISTOR SLOW START CAPACITOR BIAS CAPACITOR Figure 11. TPS54311 − 16 PCB Layout |
Similar Part No. - TPS54315PWPR |
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Similar Description - TPS54315PWPR |
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