米6体育平台手机版

ZHCSOO7A August 2021 – November 2021 TPSM8A28 , TPSM8A29

PRODUCTION DATA

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机械数据 (封装 | 引脚)

RDG|25
- MPQF603

散热焊盘机械数据 (封装 | 引脚)

订购信息

zhcsoo7a_oa

8.2.2.3 Set the Current Limit (TRIP)

The R_TRIP resistor sets the valley current limit. Equation 8 calculates the recommended current limit target. Equation 9 calculates the R_TRIP resistor to set the current limit. The typical valley current limit target is 15.0 A, and the closest standard value for R_TRIP is 4.02 kΩ.

Equation 8.

I_{L I M V A L L E Y} = I_{O U T} - \frac{1}{2} \times \frac{(V_{I N (M I N)} - V_{O U T}) \times V_{O U T}}{0.6 μ H \times V_{I N (M I N)} \times f s w} = 15 A - \frac{1}{2} \times \frac{(9.6 V - 1 V) \times 1 V}{0.6 μ H \times 9.6 V \times 600 k H z} = 13.756 A

Equation 9.

R_{T R I P} = \frac{60000}{I_{L I M V A L L E Y}} = \frac{60000}{15 A} = 4.0 k Ω

With the current limit set, Equation 10 calculates the typical maximum output current at current limit. Equation 11 calculates the typical peak current at current limit. For worst case calculations, the tolerance of the inductance (20%) and the current limit must be included.

Equation 10.

I_{O U T L I M} = I_{L I M V A L L E Y} - \frac{1}{2} \times \frac{(V_{I N (M I N)} - V_{O U T}) \times V_{O U T}}{0.6 μ H \times V_{I N (M I N)} \times f s w} = 15 A - \frac{1}{2} \times \frac{(9.6 V - 1 V) \times 1 V}{0.6 μ H \times 9.6 V \times 600 k H z} = 16.24 A

Equation 11.

I_{L (P E A K)} = I_{L I M V A L L E Y} - \frac{1}{2} \times \frac{(V_{I N (M A X)} - V_{O U T}) \times V_{O U T}}{0.6 μ H \times V_{I N (M A X)} \times f s w} = 15 A - \frac{1}{2} \times \frac{(14.4 V - 1 V) \times 1 V}{0.6 μ H \times 14.4 V \times 600 k H z} = 16.29 A