ZHCSB84F November 2011 – November 2021 TPS62130 , TPS62130A , TPS62131 , TPS62132 , TPS62133
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 Application and Implementation
- 10Power Supply Recommendations
- 11Layout
- 12Device and Documentation Support
- 13Mechanical, Packaging, and Orderable Information
8.4.3 100% Duty-Cycle Operation
The duty cycle of the buck converter is given by D = VOUT / VIN and increases as the input voltage comes close to the output voltage. In this case, the device starts 100% duty cycle operation turning on the high-side switch 100% of the time. The high-side switch stays turned on as long as the output voltage is below the internal set point. This allows the conversion of small input to output voltage differences (for example, for the longest operation time of battery-powered applications). In 100% duty cycle mode, the low-side FET is switched off.
The minimum input voltage to maintain output voltage regulation, depending on the load current and the output voltage level, can be calculated as:
where
- IOUT is the output current.
- RDS(on) is the RDS(on) of the high-side FET.
- RL is the DC resistance of the inductor used.