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TPS54110 Datasheet(PDF) 8 Page - Texas Instruments |
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TPS54110 Datasheet(HTML) 8 Page - Texas Instruments |
8 / 30 page 5 C3 + RT SYNC SS/ENA VBIAS VIN VIN VIN PGND PGND PGND PwrPd AGND VSENSE COMP PWRGD BOOT PH PH PH PH PH 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 4 3 2 1 VIN (4.5 − 5.5 V) C1 10 µF R7 10 k U2 TPS54110PWP PWRGD R4 71.5 k C5 .047 µF C4 0.1 µF C9 10 µF 21 0.047 µF R3 19.1 k C7 33 pF C6 2700 pF C8 2200 pF R5 2.05 k R1 10.7 k R2 3.92 k 1 2 L1 6.8 µH 3.3 V at 1.5 A C2 100 µF s(kHz) 100 500kHz RT(k ) = ¦ ´ W TPS54110 SLVS500C – DECEMBER 2003 – REVISED FEBRUARY 2011 www.ti.com APPLICATION INFORMATION Figure 9 shows the schematic diagram for a typical TPS54110 application. The TPS54110 can provide up to 1.5 A of output current at a nominal output voltage of 3.3 V. For proper thermal performance, the exposed PowerPAD underneath the device must be soldered down to the printed-circuit board. Figure 9. Application Schematic Design Procedure The following design procedure can be used to select component values for the TPS54110. Alternately, the SWIFT Designer Software can be used to generate a complete design. The SWIFT Designer Software uses an iterative design procedure to access a comprehensive database of components when generating a design. This section presents a simplified discussion of the design process. Design Parameters The required parameters to begin the design process and values for this design example are listed in Table 1. Table 1. Design Parameters DESIGN PARAMETER EXAMPLE VALUE Input voltage range 4.5 to 5.5 V Output voltage 3.3 V Input ripple voltage 100 mV Output ripple voltage 30 mV Output current rating 1.5 A Operating frequency 700 kHz As an additional constraint, the design is set up to be small size and low component height. Switching Frequency The switching frequency is set within the range of 280 kHz to 700 kHz by connecting a resistor from the RT pin to AGND. Equation 1 is used to determine the proper RT value. (1) In this example, the timing-resistor value chosen for R4 is 71.5 k Ω, setting the switching frequency to 700 kHz. 8 Submit Documentation Feedback © 2003–2011, Texas Instruments Incorporated Product Folder Link(s): TPS54110 |
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