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TPS54810PWP Datasheet(PDF) 8 Page - Texas Instruments |
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TPS54810PWP Datasheet(HTML) 8 Page - Texas Instruments |
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8 / 22 page  TPS54810 SLVS420B − MARCH 2002 − R EVISED FEBRUARY 2005 www.ti.com 8 APPLICATION INFORMATION Figure 9 shows the schematic diagram for a typical TPS54810 application. The TPS54810 (U1) can provide up to 8 A of output current at a nominal output voltage of 1.8 V. For proper thermal performance, the PowerPAD underneath the integrated circuit TPS54810 needs to be soldered well 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 PWRPAD AGND VSENSE COMP PWRGD SS/ENA SYNC RT 27 26 VBIAS 25 4 3 2 1 U1 TPS54810PWP 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 R5 10 kΩ C4 R3 10 kΩ 150 pF C2 R2 301 Ω 1000 pF C1 R1 10 kΩ R4 9.76 kΩ Analog and Power Grounds are Tied at the Pad Under the Package of IC Figure 9. Application Circuit COMPONENT SELECTION The values for the components used in this design example were selected for low output ripple voltage and small PCB area. Additional design information is available at www.ti.com. INPUT FILTER The input voltage is a nominal 5 VDC. The input filter C10 is a 10-µF ceramic capacitor (Taiyo Yuden). C12, also a 10-µF ceramic capacitor (Taiyo Yuden) provides high frequency decoupling of the TPS54810 from the input supply and 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, and C8. FEEDBACK CIRCUIT The values for these components have been selected to provide low output ripple voltage. 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] OUTPUT FILTER The output filter is composed of a 0.65-µH inductor and 3 x 22-µF capacitor. The inductor is a low dc resistance (0.017 Ω) type, Pulse Engineering PA0277. The capacitors used are 22-µF, 6.3 V ceramic types with X5R dielectric. The feedback loop is compensated so that the unity gain frequency is approximately 75 kHz. (1) |
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