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ZHCSOF8C november 2021 – april 2023 TPS2597

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

8.3.4.1 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 or cause the system power supply to droop leading to unexpected restarts elsewhere in the system or both. The inrush current during turn on is directly proportional to the load capacitance and rising slew rate. Use Equation 3 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 (V/ms) = \frac{I INRUSH (m A)}{C OUT (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 calulate the required C_dVdt capacitance to produce a given slew rate.

Equation 4.

C dVdt (p F) = \frac{3300}{S R (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.