ZHCSC61B March 2014 – September 2020 TPS2556-Q1 , TPS2557-Q1
PRODUCTION DATA
- 1 特性
- 2 應(yīng)用
- 3 說明
- 4 Revision History
- 5 Device Comparison Table
- 6 Terminal Configuration and Functions
- 7 Specifications
- 8 Parameter Measurement Information
- 9 Detailed Description
- 10Applications and Implementation
- 11Power Supply Recommendations
- 12Layout
- 13Device and Documentation Support
- 14Mechanical, Packaging, and Orderable Information
封裝選項(xiàng)
機(jī)械數(shù)據(jù) (封裝 | 引腳)
- DRB|8
散熱焊盤機(jī)械數(shù)據(jù) (封裝 | 引腳)
- DRB|8
訂購信息
10.2.2.2 Programming the Current-Limit Threshold
The overcurrent threshold is user-programmable via an external resistor. The TPS2556-Q1 and TPS2557-Q1 devices use an internal regulation loop to provide a regulated voltage on the ILIM terminal. The current-limit threshold is proportional to the current sourced out of ILIM. The recommended 1% resistor range for RILIM is 20 k? ≤ R(ILIM) ≤ 187 k? to ensure stability of the internal regulation loop. Many applications require that the minimum current limit be above a certain current level or that the maximum current limit be below a certain current level, so it is important to consider the tolerance of the overcurrent threshold when selecting a value for RILIM. The following equations approximate the resulting overcurrent threshold for a given value of external resistor RILIM. Consult the Electrical Characteristics table for specific current-limit settings. The traces routing the RILIM resistor to the TPS2556-Q1 and TPS2557-Q1 devices should be as short as possible to reduce parasitic effects on the current-limit accuracy.
Figure 10-2 Current-Limit Threshold versus R(ILIM)