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TPS54317 Fiches technique(PDF) 8 Page - Texas Instruments |
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TPS54317 Fiches technique(HTML) 8 Page - Texas Instruments |
8 / 21 page www.ti.com APPLICATION INFORMATION + VSNS 24 1 2 1 23 2 22 3 21 4 20 5 19 6 18 7 17 8 16 9 15 10 14 11 13 12 COMP U1 TPS54377 C1 150 F m C4 0.1 F m C7 150pF C6 3300pF 2200pF 442 W 10kW C2 100 F m L1 1.5 H m C10 100 F m C11 1000pF C9 10 F m C5 C3 C8 R5 R1 R4 R6 10kW R3 6.81kW R2 9.76kW 41.2kW 0.047 F m PWRGD BOOT PH PH PH PH PH PH NC PGND PGND PwPd AGND RT NC SYNC SS/EN VBIAS VIN VIN VIN PGND PGND VOUT PWRGD Open R( )= W 51k -4.7k ƒ (MHz) (1) INPUT VOLTAGE OUTPUT FILTER FEEDBACK CIRCUIT PCB LAYOUT OPERATING FREQUENCY TPS54377 SLVS779 – SEPTEMBER 2007 Figure 10 shows the schematic diagram for a typical TPS54377 application. The TPS54377 (U1) provides up to 3 A of output current at a nominal output voltage of 1.8 V. For proper thermal performance, the power pad underneath the TPS54377 integrated circuit needs to be soldered well to the printed circuit board. The TPS54377 can be evaluated by replacing the TPS54317 on the TPS54317 EVM. Figure 10. TPS54377 Schematic The input to the circuit is a nominal 3.3 VDC, applied at J1. The optional input filter (C1) is a 150-µF capacitor, with a maximum allowable ripple current of The output filter is composed of a 1.5-µH inductor 3 A. C9 is the decoupling capacitor for the TPS54377 and two capacitors. The inductor is a low dc and must be located as close to the device as resistance (0.017 Ω) type, Coilcraft DO1813P-122HC. possible. The feedback loop is compensated so that the unity gain frequency is approximately 75 kHz. The resistor divider network of R1 and R2 sets the output voltage for the circuit at 1.8 V. R1, along with Figure 11 shows a generalized PCB layout guide for R5, R3, C5, C7, and C8 forms the loop compensation the TPS54377. network for the circuit. For this design, a Type 3 The VIN pins should be connected together on the topology is used. printed circuit board (PCB) and bypassed with a low ESR ceramic bypass capacitor. Care should be taken to minimize the loop area formed by the bypass capacitor connections, the VIN pins, and the In the application circuit, the 1.1-MHz operation is TPS54377 ground pins. The minimum recommended selected. Connecting a 41.2-k Ω between RT (pin 22) bypass capacitance is 10-µF ceramic with a X5R or and analog ground can be used to set the switching X7R dielectric and the optimum placement is closest frequency from 280 kHz to 1.6 MHz. To calculate the to the VIN pins and the PGND pins. RT resistor, use the Equation 1: 8 Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated Product Folder Link(s): TPS54377 |
Numéro de pièce similaire - TPS54317 |
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Description similaire - TPS54317 |
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