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TPS40100 数据表(PDF) 18 Page - Texas Instruments |
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TPS40100 数据表(HTML) 18 Page - Texas Instruments |
18 / 35 page www.ti.com Design Procedure Selecting the Switching Frequency Inductor Selection L [ V IN(max) * VOUT 0.3 I OUT V OUT V IN(max) 1 f SW (6) I L(rms) + I L(avg) 2 ) 1 12 I RIPPLE 2 + I OUT 2 ) 1 12 I RIPPLE 2 (7) Output Capacitor Selection (C8) V OVER t I TRAN C OUT DT + I TRAN C OUT I TRAN L V OUT + I TRAN 2 L V OUT C OUT (8) V UNDER t I TRAN C OUT DT + I TRAN C OUT I TRAN L V IN * VOUT + I TRAN 2 L V IN * VOUT C OUT (9) C OUT(min) + I TRAN(max) 2 L V OUT V OVER (10) ESR MAX t V RIPPLE(tot) * VRIPPLE(cap) C OUT + V RIPPLE(tot) * I RIPPLE C OUT f SW I RIPPLE (11) TPS40192, TPS40193 SLUS719 – MARCH 2007 For this design the TPS40192, with fSW = 600 kHz, is selected to reduce inductor and capacitor sizes. The inductor is typically sized for approximately 30% peak-to-peak ripple current (IRIPPLE). Given this target ripple current, the required inductor size can be calculated by Equation 6. Solving this for • V IN(max) = 14 V • V OUT = 1.8 V • I OUT = 10A • f SW = 600 kHz an inductor value of 0.87 μH is obtained. A standard value of 1.0 μH is selected. Solving for IRIPPLE with 1.0 μH results in 2.6-A peak-to-peak ripple. The RMS current through the inductor is approximated by Equation 7. Using Equation 7, the maximum RMS current in the inductor is approximately 10.03 A The selection of the output capacitor is typically driven by the output transient response. The Equation 8 and Equation 9 overestimate the voltage deviation to account for delays in the loop bandwidth and can be used to determine the required output capacitance. If • V IN(min) > 2 × VOUT, use overshoot to calculate minimum output capacitance. • V IN(min) < 2 × VOUT, use undershoot to calculate minimum output capacitance. Based on a 4-A load transient with a maximum 50 mV overshoot at 8.0 V input, calculate a minimum 178- μF output capacitance. With a minimum capacitance, the maximum allowable ESR is determined by the maximum ripple voltage and is approximated by Equation 11. 18 Submit Documentation Feedback |
类似零件编号 - TPS40100 |
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类似说明 - TPS40100 |
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