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TPS54872PWPR Datasheet(PDF) 8 Page - Texas Instruments |
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TPS54872PWPR Datasheet(HTML) 8 Page - Texas Instruments |
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8 / 17 page  TPS54872 SLVS436C − JULY 2002 − REVISED FEBRUARY 2005 www.ti.com 8 APPLICATION INFORMATION Figure 7 shows the schematic diagram for a typical TPS54872 application. The TPS54872 (U1) can provide up to 8 A of output current at a nominal output voltage of one half of V(DDQ) (typically 1.25 V). For proper operation, the PowerPAD underneath the integrated circuit TPS54872 is soldered directly to the printed-circuit board. Figure 7. Application Circuit VIN C4 10 µF R2 10 k Ω C2 470 pF C1 12 pF R 3 301 Ω R1 10 k Ω C3 470 pF C12 1 µF C11 22 µF C9 22 µF C7 22 µF VTTQ L1 0.65 µH C5 3300 pF R4 2.4 W U1 TPS54872PWP 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 AGND VSENSE COMP STATUS BOOT PH PH PH PH PH PH PH PH PH RT ENA REFIN VBIAS VIN VIN VIN VIN VIN PGND PGND PGND PGND PGND C6 0.047 µF PwrPad C8 10 µF C10 1 µF R 5 71.5 k Ω R 7 10 k Ω R 6 10 k Ω C14 0.1 µF C13 0.1 µF VDDQ COMPONENT SELECTION The values for the components used in this design example were selected for good transient response and small PCB area. Ceramic dielectric 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 5.0 VDC. The input filter (C4) is a 10- µF ceramic capacitor (Taiyo Yuden). Capacitor C8, a 10- µF ceramic capacitor (Taiyo Yuden) that provides high frequency decoupling of the TPS54872 from the input supply, must be located as close as possible to the device. Ripple current is carried in both C4 and C8, and the return path to PGND should avoid the current circulating in the output capacitors C7, C9, C11, and C12. FEEDBACK CIRCUIT The values for these components are selected to provide fast transient response times. Components R1 R2, R3, C1, C2, and C3 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 cross-over frequency is typically between 80 kHz and 125 kHz for input from 4 V to 6 V. OPERATING FREQUENCY In the application circuit, RT is grounded through a 71.5 k Ω resistor to select the operating frequency of 700 kHz. To set a different frequency, place a 68-k Ω to 180-kΩ resistor between RT (pin 28) and analog ground or leave RT floating to select the default of 350 kHz. The resistance can be approximated using the following equation: R + 500 kHz Switching Frequency 100 [k W] (1) |
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Similar Description - TPS54872PWPR |
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