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TPS54613PWPR Datasheet(PDF) 8 Page - Texas Instruments |
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TPS54613PWPR Datasheet(HTML) 8 Page - Texas Instruments |
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8 / 24 page  TPS54611, TPS54612 TPS54613, TPS54614 TPS54615, TPS54616 SLVS400C − AUGUST 2001 − REVISED APRIL 2005 www.ti.com 8 APPLICATION INFORMATION Figure 10 shows the schematic diagram for a typical TPS54614 application. The TPS54614 (U1) can provide greater than 6 A of output current at a nominal output voltage of 1.8 V. For proper operation, the exposed thermal PowerPAD underneath the integrated circuit package needs to be soldered to the printed-circuit board. 13 12 7 8 6 BOOT 5 9 10 11 14 15 16 17 18 PH PH PH PH PH PH PH PH PH 19 PGND PGND PGND PGND PGND PwrPad AGND NC RT SS/ENA VIN 20 22 24 VBIAS 27 26 4 2 1 0.047 µF 7.2 µH 680 µF VO 1.8 V 10 kΩ Enable 0.1 µF VI 3 V − 6 V 21 23 28 25 3 10 µF 220 µF VIN VIN VIN VIN VSENSE PWRGD FSEL PwrGood CSS Figure 10. Application Circuit COMPONENT SELECTION The values for the components used in this design example were selected using the SWIFT designer software tool. SWIFT designer provides a complete design environment for developing dc-dc converters using the TPS54614, or other devices in the SWIFT product family. Additional design information is available at www.ti.com. INPUT FILTER The input to the circuit is a nominal 3.3 VDC or 5 VDC. The input filter is a 220-µF POSCAP capacitor, with a maximum allowable ripple current of 3 A. A 10-µF ceramic capacitor for the TPS54614 is required, and must be located as close as possible to the device. FEEDBACK CIRCUIT The output voltage of the converter is fed directly into the VSENSE pin of the TPS54614. The TPS54614 is internally compensated to provide stability of the output under varying line and load conditions. OPERATING FREQUENCY In the application circuit, 350 kHz operation is selected by leaving FSEL open. Different operating frequencies can be selected by connecting a resistor between RT pin and AGND. Choose the value of R using Equation 1 for the desired operating frequency: R + 500 kHz SwitchingFrequency 100 kW Alternately, a preset operating frequency of 550 kHz can be selected by leaving RT open and connecting the FSEL pin to VI. OUTPUT FILTER The output filter is composed of a 5.2-µH inductor and a 470-µF capacitor. The inductor is low dc resistance (16-mΩ) type, Sumida CDRH104R−5R2. The capacitor used is a 4-V POSCAP with a maximum ESR of 40 mΩ. The output filter components work with the internal compensation network to provide a stable closed loop response for the converter. (1) |
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