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TPS54873 Datasheet(PDF) 8 Page - Texas Instruments |
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TPS54873 Datasheet(HTML) 8 Page - Texas Instruments |
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8 / 23 page  TPS54873 SLVS444A − OCTOBER 2002 − REVISED FEBRUARY 2005 www.ti.com 8 APPLICATION INFORMATION Figure 9 shows the schematic diagram for a typical TPS54873 application. The TPS54873 (U1) can provide up to 8 A of output current at a nominal output voltage of 0.9 V to 3.3 V, and for this application, the output voltage is set at 3.3 V. For proper operation, the PowerPAD underneath the integrated circuit TPS54873 must be soldered properly to the printed-circuit board. R6 71.5 kΩ 28 27 26 25 0.047 µF 4 3 2 1 24 23 22 21 20 14 13 12 11 10 9 8 7 6 5 19 18 17 16 15 1 µF 10 kΩ 10 kΩ 10 kΩ 470 pF 12 pF 301 Ω 3.74 kΩ 0.1 µF 22 µF 22 µF 22 µF L1 0.65 µH 2.4 kΩ 3300 pF 0.047 µF 10 µF 470 pF 10 µF VIN 1 A, 200 V D1 1 A, 200 V D2 RT SYNCH SS/ENA VBIAS PWRGD COMP/NC VSENSE ANGND PowerPAD VIN VIN VIN VIN VIN PH PH PH PH PH PH PH PH PH BOOT PGND PGND PGND PGND PGND U1 TPS54873 C6 C3 R5 R1 R3 C4 C1 R2 C2 R4 VOUT C13 C5 C7 C8 R7 C11 C9 C10 C12 VIN 1 A, 200 V D3 1 A, 200 V D4 Figure 9. Application Circuit COMPONENT SELECTION The values for the components used in this design example are selected for low output ripple and small PCB area. Ceramic capacitors are utilized in the output filter circuit. A small size, small value output inductor is also used. Compensation network components are chosen to maximize closed loop bandwidth and provide good transient response characteristics. Additional design information is available at www.ti.com. INPUT VOLTAGE The input voltage is a nominal 5. VDC. The input filter (C12) is a 10-µF ceramic capacitor (Taiyo Yuden). C10, also a 10-µF ceramic capacitor (Taiyo Yuden) that provides high frequency decoupling of the TPS54873 from the input supply, must be located as close as possible to the device. Ripple current is carried in both C10 and C12, and the return path to PGND should avoid the current circulating in the output capacitors C5, C7, C8, and C13. FEEDBACK CIRCUIT The values for these components are selected to provide fast transient response times. R1, R2, R3, R4, C1, C2, and C4 forms the loop-compensation network for the circuit. For this design, a Type 3 topology is used. The transfer function of the feedback network is chosen to provide maximum closed loop gain available with open loop characteristics of the internal error amplifier. Closed loop crossover frequency is typically between 80 kHz and 135 kHz for input from 3 V to 6 V. |
Similar Part No. - TPS54873_16 |
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Similar Description - TPS54873_16 |
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