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Enhancing Power Efficiency for Sensor Applications

Improve power availability for sensors in 2-wire current loop transmitters. Utilize XTR115 and TPS54062 to lower loop supply and maintain desired output levels. Test results confirm increased performance with reduced input capacitance settings.

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Enhancing Power Efficiency for Sensor Applications

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  1. XTR115 + TPS54062 Objective:Increase the available power for sensor and other external circuitry on a remote 2-wire current loop transmitter. With existing designs, sensors and systems that draw more than ~3.3mA will not be able to meet typical under-scale current or zero-scale levels of 3.8mA or 4mA. Loop Supply – 16VDesired Iout range = 3.8mA DC – 20.2mA DC with 1mApp HART AC signalRequired Sensor Current = 7.1mA

  2. XTR115 + TPS54062 Solution:Use low-current buck topology switching power converter to buck down the loop-supply to the required VREG levels. All SMPS current must sink back through IRET of XTR115.

  3. XTR115 + TPS54062 Setup: XTR115 + TPS54062EVM with reduced input capacitance of 1uF Output: 3.8mA DC + 1mAPP 2.2kHz HART signal Results: At 2.2kHz, Max IRET increased to 2.6mA before signal degradation occurred IRET = 2.6mA TPS_IOUT = 7.2mA

  4. XTR115 + TPS54062 Setup: XTR115 + TPS54062EVM with reduced input capacitance of 1uF Output: 3.8mA DC + 1mAPP 2.2kHz HART signal Results: Showing the +3.3V output with the reduced 1uF capacitance, output looks good AC Couple DC Couple

  5. XTR115 + TPS54062 Setup: XTR115 + TPS54062EVM with reduced input capacitance of 0.47uF Output: 3.8mA DC + 1mAPP 2.2kHz HART signal Results: At 2.2kHz, Max IRET increased to 2.85mA before signal degradation occurred IRET = 2.8mA TPS_IOUT = 9mA

  6. XTR115 + TPS54062 Setup: XTR115 + TPS54062EVM with reduced input capacitance of 0.47uF Output: 3.8mA DC + 1mAPP 2.2kHz HART signal Results: At 2.2kHz, Max IRET increased to 2.85mA before signal degradation occurred IRET = 2.85mA TPS_IOUT = 9.25mA

  7. XTR115 + TPS54062 Setup: XTR115 + TPS54062EVM with reduced input capacitance of 0.47uF Output: 3.8mA DC + 1mAPP 2.2kHz HART signal Results: At 2.2kHz, Showing distortion with IRET = 2.9mA IRET = 2.9mA TPS_IOUT = 9.5mA

  8. XTR115 + TPS54062 Setup: XTR115 + TPS54062EVM with reduced input capacitance of 0.47uF Output: 3.8mA DC + 1mAPP 2.2kHz HART signal Results: At 2.2kHz, Showing distortion with IRET = 3mA IRET = 3mA TPS_IOUT = 10mA

  9. XTR115 + TPS54062 Setup: XTR115 + TPS54062EVM with reduced input capacitance of 0.47uF Output: 3.8mA DC + 1mAPP 2.2kHz HART signal Results: Showing the +3.3V output with the reduced 0.47uF capacitance, output looks good AC Couple DC Couple

  10. XTR115 + TPS54062 Setup: XTR115 + TPS54062EVM with reduced input capacitance of 0.47uF Output: 3.8mA DC + 1mAPP 2.2kHz HART signal Results: Showing the +16V input ripple with the reduced 0.47uF capacitance, looks similar when compared to original 0.47uF Input Cap 2.2uF Input cap

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