米6体育平台手机版

ZHCSOF9B april 2022 – june 2023 TPS25981

PRODUCTION DATA

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机械数据 (封装 | 引脚)

RPW|10
- MPQF568

散热焊盘机械数据 (封装 | 引脚)

订购信息

8.3.3.1 Slew Rate (dVdt) and Inrush Current Control

During hot-plug events or while trying to charge a large output capacitance at start-up, there can be a large inrush current. If the inrush current is not managed properly, it can damage the input connectors and cause the system power supply to droop leading to unexpected restarts elsewhere in the system. The inrush current during turn-on is directly proportional to the load capacitance and rising slew rate. Equation 3 can be used to find the slew rate (SR) required to limit the inrush current (I_INRUSH) for a given load capacitance (C_OUT):

Equation 3.

S R (\frac{V}{m s}) = \frac{I_{I N R U S H} (m A)}{C_{O U T} (µ F)}

A capacitor can be connected to the dVdt pin to control the rising slew rate and lower the inrush current during turn on. Use Equation 4 to calculate the required C_dVdt capacitance to produce a given slew rate.

Equation 4.

C_{d V d t} (p F) = \frac{3300}{S R (\frac{V}{m s})}

The fastest output slew rate is achieved by leaving the dVdt pin open.

Note:

For C_dVdt > 10 nF, TI recommends to add a 100-Ω resistor in series with the capacitor on the dVdt pin.