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ZHCSNL3A December 2021 – November 2023 TPSM8D6C24

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机械数据 (封装 | 引脚)

MOW|59

散热焊盘机械数据 (封装 | 引脚)

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7.2.2.5 Output Capacitor Selection

Output capacitors are selected to meet the output ripple requirements and stabilize the votlage loop below V_BW(max).

To stabilize the loop below V_BW(max), evaluate the output impedance of available electrolytic and ceramic capacitors at the target voltage loop bandwidth frequency and combine capacitors in parallel to reduce the total output impedance of the capacitor bank below.

Equation 11.

Z_{O U T (V_{B W})} < \frac{C S A}{N \times V_{L O O P} \times V O U T_S C A L E_L O O P}

Equation 12.

Z_{O U T (V_{B W})} < \frac{6.155 m V / A}{1 \times 4 \times 0.5} = 3.08 m Ω

Equation 13.

Z_{C_47 μ F} = \frac{1}{2 π f_{S W} C} = \frac{1}{2 π \times 87 k H z \times 47 μ F} = 38.9 m Ω

Equation 14.

Z_{C_470 μ F} = \frac{1}{2 π f_{S W} C} = \frac{1}{2 π \times 87 k H z \times 470 μ F} = 3.89 m Ω