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TPS54910PWPRG4 Datasheet(PDF) 8 Page - Texas Instruments |
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TPS54910PWPRG4 Datasheet(HTML) 8 Page - Texas Instruments |
8 / 22 page TPS54910 SLVS421C − MARCH 2002 − REVISED FEBRUARY 2005 www.ti.com 8 APPLICATION INFORMATION Figure 10 shows the schematic diagram for a typical TPS54910 application. The TPS54910 (U1) can provide up to 9 A of output current at a nominal output voltage of 1.8 V. For proper thermal performance, the exposed thermal PowerPAD underneath the integrated circuit, TPS54910, package must be soldered to the printed-circuit board. 28 6 VIN 24 23 22 21 20 VIN VIN VIN VIN 14 13 12 11 10 9 8 7 PH PH PH PH PH PH PH PH PH 5 BOOT 19 18 17 16 15 PGND PGND PGND PGND PGND POWERPAD AGND VSENSE COMP PWRGD SS/ENA SYNC RT 27 26 VBIAS 25 4 3 2 1 U1 TPS54910PWP 0.047 µF C9 0.047 µF L1 0.65 µH C8 22 µF C10 10 µF C12 10 µF VO 3300 pF VI R7 2.4 Ω C11 3300 pF C7 22 µF C5 22 µF R6 71.5 kΩ C6 1 µF C3 R7 10 kΩ C4 R3 10 kΩ 150 pF C2 R2 301 Ω 1000 pF C1 R1 10 Ω R4 9.76 kΩ Analog and Power Grounds Are Tied at the Pad Under the Package of IC Figure 10. Application Circuit COMPONENT SELECTION The values for the components used in this design example were selected for best load transient response and small PCB area. Additional design information is available at www.ti.com. INPUT FILTER The input voltage is a nominal 3.3 VDC. The input filter (C10) is a 10-µF ceramic capacitor (Taiyo Yuden). C12 is also a 10-µF ceramic capacitor (Taiyo Yuden) that provides high-frequency decoupling of the TPS54910 from the input supply. C12 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 must avoid the current circulating in the output capacitors C5, C7, and C8. FEEDBACK CIRCUIT The values for these components are selected to provide fast transient response times. The resistor divider network of R1 and R4 sets the output voltage for the circuit at 1.8 V. R1 along with R2, R3, C1, C2, and C4 forms the loop compensation network for the circuit. For this design, a Type-3 topology is used. OPERATING FREQUENCY In the application circuit, RT is grounded through a 71.5-kΩ resistor to select the operating frequency of 700 kHz. To set a different frequency, place a 68-kΩ 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 [kW] (1) |
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Similar Description - TPS54910PWPRG4 |
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