{"product_id":"voltage-to-current-v-i-converter","title":"Voltage to Current (V-I) Converter","description":"\u003cp\u003eThe circuit shown here is a high-side voltage-to-current (V-I) converter. It translates an input voltage of\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e0 V to 2 V\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eto an output current of\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e0 mA to 100 mA\u003c\/strong\u003e. The low offset voltage and offset drift of the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eOPA2333\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003efacilitate excellent DC accuracy for the circuit.\u003c\/p\u003e\n\u003cp\u003eThe project provides a high-side current source that supplies an adjustable current to a ground reference load. The first op-amp stage sets a reference current based on the input control voltage. The second op-amp stage acts as a current mirror that gains the reference current and regulates the current sourced from the output PMOSFET Q2 to the load. R2, R4, and R10 set the output current based on the input control voltage. Components C7, R9, R8, R7, C6, R3 provide compensation to ensure stability of the circuit.\u003c\/p\u003e\n\u003cp\u003eThe V-I transfer function of the circuit is based on the relationship between the input voltage, V\u003csub\u003eIN\u003c\/sub\u003e, and the three current sensing resistors, R2, R4, and R10. The relationship between V\u003csub\u003eIN\u003c\/sub\u003e\u003cspan\u003e \u003c\/span\u003eand R10 determines the current that flows through the first stage of the design. The current gain from the first stage to the second stage is based on the relationship between R2 and R4. The project is built using\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eOPA2333\u003c\/strong\u003e. Low offset voltage, low-temperature drift, and rail-to-rail output are the key features of this op-amp. The\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eOPA2333\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eCMOS operational amplifier is a high precision,\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e5-uV\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eoffset,\u003cstrong\u003e\u003cspan\u003e \u003c\/span\u003e0.05-μV\/°C\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003edrift amplifier optimized for low-voltage, single-supply operation with an output swing to within\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e50 mV\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eof the positive rail. The OPA2333 family uses chopping techniques to provide low initial offset voltage and near-zero drift over time and temperature. Low offset voltage and low drift reduce the offset error in the system, making these devices appropriate for precise DC control. The rail-to-rail output stage of the OPA2333 ensures that the output swing of the operational amplifier is able to fully control the gate of the MOSFET devices within the supply rails.\u003c\/p\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eInput Supply 5V DC\u003c\/li\u003e\n\u003cli\u003eInput Control Voltage 0 to 2V\u003c\/li\u003e\n\u003cli\u003eOutput 0 to 100mA\u003c\/li\u003e\n\u003cli\u003eJumper For External\/Internal Control Voltage Selection\u003c\/li\u003e\n\u003cli\u003eReference Voltage Generator Chip for 2V Control Voltage Source\u003c\/li\u003e\n\u003cli\u003eHeader Connector for Input and Output and Power Supply\u003c\/li\u003e\n\u003cli\u003eOn Board Power LED\u003c\/li\u003e\n\u003cli\u003eOn Board Trimmer Potentiometer for Control Voltage Adjustment\u003c\/li\u003e\n\u003cli\u003eHeader Connector for External Control Voltage\u003c\/li\u003e\n\u003cli\u003ePCB Dimensions 36.83 x 20.96 mm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e Connections and Other Details\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCN1: Pin 1 = 2V Input, Pin 2 = GND (External Control Voltage)\u003c\/li\u003e\n\u003cli\u003eCN2: Pin 1,2 = VCC, Pin 3,4 = GND\u003c\/li\u003e\n\u003cli\u003eCN3: Pin 1,2 = +Load, Pin 3,4 = GND\u003c\/li\u003e\n\u003cli\u003eD1: Power LED\u003c\/li\u003e\n\u003cli\u003eJ1: Solder Jumper for External or Internal Control Voltage Selection. Open = External Control Voltage, Closes = Internal Control Voltage\u003c\/li\u003e\n\u003cli\u003eJ2: Always Closed\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"dotfry","offers":[{"title":"Default Title","offer_id":47210153345196,"sku":"B130","price":13.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0757\/6436\/7532\/files\/B130A.jpg?v=1789458329","url":"https:\/\/dotfry.com\/products\/voltage-to-current-v-i-converter","provider":"dotfry","version":"1.0","type":"link"}