ZHCSFD9B July 2016 – October 2018 TPS61230A
PRODUCTION DATA.
- 1 特性
- 2 应用
- 3 说明
- 4 修订历史记录
- 5 Pin Configuration and Functions
- 6 Specifications
- 7 Detailed Description
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8 Application and Implementation
- 8.1 Application Information
- 8.2
Typical Applications
- 8.2.1 TPS61230A 2.5-V to 4.5-V Input, 5-V Output Converter
- 8.2.2 Systems Example - TPS61230A with Feed Forward Capacitor for Best Transient Response
- 9 Power Supply Recommendations
- 10Layout
- 11器件和文档支持
- 12机械、封装和可订购信息
7.3.4 Current Limit Operation
During the startup phase, the output current is limited to the pre-charge current limit which is proportional to the output voltage. The device could support minimum 1.0A output current at 2.5V input.
The TPS61230A employs a valley current sensing scheme at the normal boost switching phase. The switch valley current limit detection occurs during the off time through the sensing the voltage drop across the rectifier FET. If the switch valley current is lower than the valley current limit level, the device turns off the rectifier FET. The maximum continuous output current (IOUT_LIM), prior to entering current limit operation, can be defined by:
If the output current is further increased and the output voltage is pulled blow the input voltage, the TPS61230A enters into the hiccup protection mode. The average current and thermal will be much lowered at the hiccup steady state and the device could recovery automatically as long as the over load condition being released.
Figure 13. Current Limit Operation