XTR110 expand the drive current circuit diagram

Description: The XTR110 features an internal voltage reference that can output a current of 10mA. By incorporating an external NPN transistor, designated as QREF, the output current capability can be increased. When the VCC voltage reaches 40V, a 2N3055 transistor can be utilized to further extend the output current capacity up to 100mA.

The XTR110 is a precision current loop transmitter that is commonly used in industrial applications for converting voltage signals into current signals. The internal voltage reference of the XTR110 provides a stable reference point, allowing for consistent performance across various operating conditions. The output current of 10mA is suitable for many applications; however, in scenarios where higher current output is required, the addition of an external NPN transistor, such as the 2N3055, is advantageous.

The 2N3055 is a power transistor capable of handling higher currents and voltages, making it an ideal choice for this application. By connecting the 2N3055 to the output of the XTR110, the current output can be increased significantly, allowing the circuit to drive larger loads or longer cable runs without signal degradation. This configuration is particularly useful in applications where the load impedance may vary or where additional current is necessary for proper operation.

To implement this enhancement, the base of the 2N3055 should be connected to the output of the XTR110, while the collector is connected to the load. The emitter of the 2N3055 will provide the increased current output. It is essential to ensure that the power supply voltage (VCC) does not exceed the maximum rating of the 2N3055, which can handle up to 40V, to prevent damage to the transistor.

This setup allows for flexible design options in current loop applications, providing the ability to scale the output current based on specific requirements while maintaining the precision and stability of the XTR110's voltage reference. Proper heat sinking should also be considered for the 2N3055 to ensure reliable operation under higher current conditions. As shown in FIG, XTR110 internal voltage reference output current of 10mA, add an external NPN transistor QREF can expand the output current. When VCC rises to 40V, the transis tor QREF taken as 2N3055, can expand the output current (up to 100mA).