ZHCSGF0D July 2017 – October 2019 MCP6291 , MCP6292 , MCP6294
PRODUCTION DATA.
- 1 特性
- 2 應(yīng)用
- 3 說明
- 4 修訂歷史記錄
- 5 Device Comparison Table
- 6 Pin Configuration and Functions
- 7 Specifications
- 8 Detailed Description
- 9 Application and Implementation
- 10Power Supply Recommendations
- 11Layout
- 12器件和文檔支持
- 13機(jī)械、封裝和可訂購信息
封裝選項(xiàng)
機(jī)械數(shù)據(jù) (封裝 | 引腳)
散熱焊盤機(jī)械數(shù)據(jù) (封裝 | 引腳)
訂購信息
9.2.2 Detailed Design Procedure
The transfer function of the circuit in Figure 33 is shown in Equation 1.
The load current (ILOAD) produces a voltage drop across the shunt resistor (RSHUNT). The load current is set from 0 A to 1 A. To keep the shunt voltage below 100 mV at maximum load current, the largest shunt resistor is defined using Equation 2.
Using Equation 2, RSHUNT is 100 mΩ. The voltage drop produced by ILOAD and RSHUNT is amplified by the MCP629x to produce an output voltage of roughly 0 V to 4.95 V. The gain needed by the MCP629x to produce the necessary output voltage is calculated using Equation 3:
Using Equation 3, the required gain is calculated to be 49.5 V/V, which is set with resistors RF and RG. Equation 4 is used to size the resistors, RF and RG, to set the gain of the MCP629x to 49.5 V/V.
Choosing RF as 165 kΩ and RG as 3.4 kΩ provides a combination that equals roughly 49.5 V/V. Figure 34 shows the measured transfer function of the circuit shown in Figure 33.