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TPS54372 Datasheet(PDF) 8 Page - Texas Instruments |
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TPS54372 Datasheet(HTML) 8 Page - Texas Instruments |
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8 / 21 page  www.ti.com APPLICATION INFORMATION J2 + + J1 2 1 VI GND TP1 C4 10 µF TP2 TP3 U1 TPS54372PWP 20 19 18 17 16 15 14 13 12 11 1 2 3 4 5 6 7 8 9 10 AGND VSENSE COMP STATUS BOOT PH PH PH PH PH PwrPAD 21 RT ENA REFIN VBIAS VIN VIN VIN PGND PGND PGND R2 36.5 k Ω C2 470 pF C1 12 pF C6 0.047 pF R1 10 k Ω R3 1.21 k Ω C3 1500 pF TP4 R4 2.4 Ω C5 3300 pF L1 1 µH 1 2 C7 150 µF C10 150 µF C11 1 µF TP5 TP6 TP7 1 2 VTTQ GND TP8 C8 10 µF C9 1 µF R5 71.5 k Ω R7 10 k Ω C12 0.1 µF C13 0.1 µF R6 10 k Ω TP9 J2 1 2 VDDQ GND TYPICAL CIRCUIT INPUT VOLTAGE COMPONENT SELECTION FEEDBACK CIRCUIT TPS54372 SLVS430D – JUNE 2002 – REVISED FEBRUARY 2005 Figure 8. Application Circuit Figure 8 shows the schematic diagram for a typical The input voltage is a nominal 3.3 or 5.0 Vdc. The TPS54372 application. The TPS54372 (U1) can pro- input filter (C4) is a 10-µF ceramic capacitor (Taiyo vide up to 3 A of output current at a nominal output Yuden). Capacitor C8, a 10-µF ceramic capacitor voltage of one half of VDDQ (typically 1.25 V). For (Taiyo Yuden) that provides high-frequency decoup- proper operation, the PowerPAD underneath the ling of the TPS54372 from the input supply, must be integrated circuit TPS54372 is soldered directly to the located as close as possible to the device. Ripple printed-circuit board. current is carried in both C4 and C8, and the return path to PGND should avoid the current circulating in the output capacitors C7, C10, and C11. The values for the components used in this design example were selected for good transient response and small PCB area. Special polymer capacitors are The values for these components are selected to used in the output filter circuit. A small size, small provide fast transient response times. Components value output inductor is also used. Compensation R1, R2, R3, C1, C2, and C3 form the loop compen- network components are chosen to maximize sation network for the circuit. For this design, a closed-loop bandwidth and provide good transient Type-3 topology is used. The transfer function of the response characteristics. Additional design infor- feedback network is chosen to provide maximum mation is available at www.ti.com. closed-loop gain available with open-loop character- istics of the internal error amplifier. Closed-loop crossover frequency is typically between 80 kHz and 125 kHz for input from 3 V to 6 V. 8 |
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