Dual-Channel, 0V to 76V Current-Sense Amplifier
The MAX40201F is available in various gain configurations; this project employs the MAX40201F with a gain (G) of 50V/V. With a 0.05 Ohm shunt resistor, the output is 2.5V for a 1A current flow (1A/2.5V). Higher current measurements can be achieved by using a lower-value shunt resistor or by selecting a MAX40201 chip with a lower gain. The input common-mode range is 0V to 76V.
Current Sense Resistor vs. Gain Considerations:
Ideally, the maximum load current should generate the full-scale sense voltage across the current-sense resistor. The appropriate gain should be selected to achieve the desired maximum output voltage for the specific application. The relationship is defined by the following equation:
Vout = I-Load * Rsense * Gain
For example, with a 1A load current, a 0.05 Ohm shunt resistor, and a gain of 50V/V, the output voltage is:
Vout = 1A * 0.05 Ohm * 50V/V = 2.5V
Where Rsense is the full-scale sense voltage (50mV for a gain of 50V/V). This formula allows the user to select the appropriate sense resistor value based on the specific application requirements.
Features
- Power Supply 5V DC (Range 2.7V to 5.5V)
- Current Monitor Output 2.5V/1Amp
- Load Current Monitor Up to 2Amp
- Common Mode Input Voltage Range 0 to 76V
- 2 Channel Current Sense
- Precision Output, Gain Error less than 0.1%
- Low 12μV (max) Input Offset Voltage
- Screw Terminal Connectors for Inputs and Load Outputs
- Header Connector for Power Supply and Current Monitor Outputs (VO)
- 4X4MM PCB Mounting Holes
- PCB Dimensions 41.28 x 34.13 mm
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The MAX40201F is available in various gain configurations; this project employs the MAX40201F with a gain (G) of 50V/V. With a 0.05 Ohm shunt resistor, the output is 2.5V for a 1A current flow (1A/2.5V). Higher current measurements can be achieved by using a lower-value shunt resistor or by selecting a MAX40201 chip with a lower gain. The input common-mode range is 0V to 76V.
Current Sense Resistor vs. Gain Considerations:
Ideally, the maximum load current should generate the full-scale sense voltage across the current-sense resistor. The appropriate gain should be selected to achieve the desired maximum output voltage for the specific application. The relationship is defined by the following equation:
Vout = I-Load * Rsense * Gain
For example, with a 1A load current, a 0.05 Ohm shunt resistor, and a gain of 50V/V, the output voltage is:
Vout = 1A * 0.05 Ohm * 50V/V = 2.5V
Where Rsense is the full-scale sense voltage (50mV for a gain of 50V/V). This formula allows the user to select the appropriate sense resistor value based on the specific application requirements.
Features
- Power Supply 5V DC (Range 2.7V to 5.5V)
- Current Monitor Output 2.5V/1Amp
- Load Current Monitor Up to 2Amp
- Common Mode Input Voltage Range 0 to 76V
- 2 Channel Current Sense
- Precision Output, Gain Error less than 0.1%
- Low 12μV (max) Input Offset Voltage
- Screw Terminal Connectors for Inputs and Load Outputs
- Header Connector for Power Supply and Current Monitor Outputs (VO)
- 4X4MM PCB Mounting Holes
- PCB Dimensions 41.28 x 34.13 mm
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