SBOU034B February   2006  – October 2025 XTR300

 

  1.   1
  2.   Description
  3.   Features
  4.   Applications
  5.   5
  6. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 XTR300EVM Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
  7. 2Hardware
    1. 2.1 Evaluation Setup
    2. 2.2 Jumper Configuration Settings
    3. 2.3 Features
      1. 2.3.1 Input Signal
      2. 2.3.2 Reference Voltage
      3. 2.3.3 XTR300EVM Output
      4. 2.3.4 Error Flags
      5. 2.3.5 IMON: Current Monitor Output
      6. 2.3.6 IAOUT: Voltage Monitor
      7. 2.3.7 Other Test Points
    4. 2.4 Output Mode Configurations
      1. 2.4.1 Current Mode Configurations
        1. 2.4.1.1 Single-Ended Current Output
        2. 2.4.1.2 Bidirectional Current Output
        3. 2.4.1.3 Verifying Acceptable Load in Current Mode
      2. 2.4.2 Voltage Mode Configurations
        1. 2.4.2.1 Single-Ended Voltage Output
        2. 2.4.2.2 Bidirectional Voltage Output
        3. 2.4.2.3 Verifying Acceptable Load in Voltage Mode
    5. 2.5 Power Requirements
  8. 3Hardware Design Files
    1. 3.1 Schematic
    2. 3.2 XTR300EVM Top Layer Silkscreen
    3. 3.3 Bill of Materials
  9. 4Additional Information
    1. 4.1 Trademarks
  10. 5Related Documentation
  11. 6Revision History

2.4.2.3 Verifying Acceptable Load in Voltage Mode

Verify that the XTR300 is able to drive the resistive load in a particular application. To calculate this, there are two limits to consider, the output voltage swing and the output current limits.

The output voltage swing limits are directly tied to the supply voltages. As shown in Equation 14, the output can only swing up to 3V from the supply rails.

Equation 14. V- + 3 ≤ V O U T L I M I T _ R A N G E ≤ ( V+ ) - 3

In voltage mode, the output voltage is set by the user and directly controlled.

The output current swing limits are determined by the minimum short circuit current limit, which can be found in the data sheet as:

Equation 15. I S C M i n = ± 15mA

In voltage mode, the user needs to verify that for whatever the output voltage range is selected, must not violate the output current limits with the load of the system. Use Ohm's law to find what minimum and maximum output current are needed for the output voltage range as shown in Equation 16 and Equation 17.

Equation 16. I O U T M I N = V O U T M I N R L O A D
Equation 17. I O U T M A X = V O U T M A X R L O A D

If the output current goes beyond the output current limit of ±15mA then the XTR300 cannot drive the load under these conditions.

For example, in a system where the V+=15V, V-=-15V, RLOAD =200Ω, and require an output voltage from 0V to 10V, to verify that the output does not be saturated, first evaluate what the acceptable output voltage range is by plugging in the supply rails to Equation 14. In this example, the output is able to produce a voltage range of...
Equation 18. - 12V ≤ V O U T L I M I T _ R A N G E ≤ 12V

This confirms that the output voltage is not violated.

Plugging 0V, 10V, and 200Ω to Equation 16 and Equation 17 produce:
Equation 19. I O U T M I N = 0mA

and

Equation 20. I O U T M A X = 50mA

The maximum output current needed is higher than what the XTR300 is able to output in this example, resulting in a maximum output voltage to be 3V.