ZHCSDX3F June 2015 – September 2021 TPS61098 , TPS610981 , TPS610982 , TPS610985 , TPS610986 , TPS610987
PRODUCTION DATA
- 1 特性
- 2 應用
- 3 說明
- 4 Revision History
- 5 Device Comparison Table
- 6 Pin Configuration and Functions
- 7 Specifications
- 8 Detailed Description
- 9 Applications and Implementation
- 10Power Supply Recommendations
- 11Layout
- 12Device and Documentation Support
- 13Mechanical, Packaging, and Orderable Information
8.3.2 Pass-Through Operation
The TPS61098x supports automatic pass-through function for the boost converter. When the input voltage is detected higher than the pass-through threshold V(PSTH), which is around V(MAIN) set value, the boost converter enters into pass-through operation mode. In this mode, the boost converter stops switching, the rectifier is constantly turned on and the low side switch is turned off. The input voltage passes through external inductor and the internal rectifier to the output. The output voltage in this mode depends on the resistance between the input and the output, calculated as Equation 1:
where
- RL is the DCR of external inductor
- RDS(on)_HS is the resistance of internal rectifier
When the input voltage is lower than V(PSTH), the boost converter resumes switching to regulate the output at target value.
The TPS61098x can support automatic pass-through function in both Active mode and Low Power mode.