米6体育平台手机版

ZHCSQK6 May 2022 TPS92643-Q1

PRODUCTION DATA

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机械数据 (封装 | 引脚)

PWP|16
- MPDS371A

散热焊盘机械数据 (封装 | 引脚)

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zhcsqk6_oa

8.1.4 Inductor Selection

The inductor is sized to meet the ripple specification at maximum operating duty cycle. TI recommends a minimum sensed peak-to-peak voltage ripple (ΔV_(CSP-CSN)) of 8 mV to ensure periodic switching operation under.

Equation 16.

∆ V_{(C S P - C S N)} = ∆ i_{L} \times R_{C S}

Use Equation 17 to calculate the inductor value.

Equation 17.

L = \frac{V_{I N, M I N} - V_{C S N, M A X}}{∆ i_{L} \times f_{S W}} \times \frac{V_{C S N, M A X}}{V_{I N, M I N}}

The maximum inductor current ripple occurs at 50% duty cycle. Use Equation 18 to calculate the maximum peak-to-peak inductor current ripple, Δi_L(MAX).

Equation 18.

∆ i_{L (M A X)} = \frac{V_{I N (T Y P)}}{4 \times L \times f_{S W}}

Use Equation 19 and Equation 20 to calculate the RMS and peak currents through the inductor. Make sure that the inductor is rated to handle these currents.

Equation 19.

i_{L (R M S)} = \sqrt{(I_{L E D (M A X)}^{2} + \frac{Δ I_{L (M A X)}^{2}}{12})}

Equation 20.

i_{L (P K)} = I_{L E D (M A X)} + \frac{Δ i_{L (M A X)}}{2}