ZHCSB85F November 2011 – October 2021 TPS62140 , TPS62140A , TPS62141 , TPS62142 , TPS62143
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
9.2.2.1 Programming the Output Voltage
While the output voltage of the TPS62140 (TPS62140A) is adjustable, the TPS62141, TPS62142, and TPS62143 are programmed to fixed output voltages. For fixed output versions, the FB pin is pulled down internally and can be left floating. It is recommended to connect to AGND to improve thermal resistance. The adjustable version can be programmed for output voltages from 0.9 V to 6 V by using a resistive divider from VOUT to AGND. The voltage at the FB pin is regulated to 800 mV. The value of the output voltage is set by the selection of the resistive divider from Equation 6. It is recommended to choose resistor values which allow a current of at least 2 μA, meaning the value of R2 should not exceed 400 kΩ. Lower resistor values are recommended for highest accuracy and most-robust design. For applications requiring lowest current consumption, the use of fixed output-voltage versions is recommended.
In case the FB pin is opened, the device clamps the output voltage at the VOS pin internally to about 7.4 V.