ZHCSIC0A September 2018 – November 2018 TPS61088-Q1
PRODUCTION DATA.
- 1 特性
- 2 应用
- 3 说明
- 4 修订历史记录
- 5 （说明 （续））
- 6 Pin Configuration and Functions
- 7 Specifications
- 8 Detailed Description
- 9 Application and Implementation
- 10Power Supply Recommendations
- 11Layout
- 12器件和文档支持
- 13机械、封装和可订购信息
9.2.2.3 Setting Peak Current Limit
The peak input current is set by selecting the correct external resistor value correlating to the required current limit. Because the TPS61088-Q1 is configured to work in the PFM mode in light load condition, use Equation 6 to calculate the correct resistor value:
where
- RILIM is the resistance connected between the ILIM pin and ground.
- ILIM is the switching peak current limit.
For a typical current limit of 11.0 A, the resistor value is 49.9 kΩ. Considering the device variation and the tolerance over temperature, the minimum current limit at the worst case can be 1.3 A lower than the value calculated by Equation 6. The minimum current limit must be higher than the required peak switch current at the lowest input voltage and the highest output power to make sure the TPS61088-Q1 does not hit the current limit and still can regulate the output voltage in these conditions.