SPRT794 June   2025 TLV3511

 

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TLV3511 TLV3512 TLV3231 TLV3232 LMV7219 Typical Application: Arc Fault Detection Figure 1 Typical Application: Arc Fault Detection

Due to the high frequency content of an arc fault detection circuit, a high-speed comparator is utilized to translate the signal signature into digital pulses. Circuit designers now have alternative comparators to the LMV7219 to select from depending on the need for more precision (TLV3511) or lower power consumption (TLV3231).

Design Challenges

  • Fast response time
  • Symmetrical timing on low-to-high and high-to-low signal edges
  • Low input offset to maintain minimal timing error from amplifier output to comparator input
  • Minimal power consumption

How High-Speed Comparators Benefit the Systems

  • A comparator's fast response time enables the capturing of waveforms with spectrum up to 10MHz and beyond without loss of signal integrity
  • Symmetrical prop delay and rise-fall times of a push-pull output stage enables the arc fault signal to be digitized without distortion and with minimal timing error
  • Low power consumption is necessary due to the always-on nature of arc fault detectors and minimizes power drain on building power system
  • Low input offset voltage maintains the integrity of an arc fault signature by triggering the comparator output at the precise threshold voltage, rendering an accurate digital waveform for post-processing
Part Number Propagation Delay Toggle Frequency Quiescent Current Input Offset Voltage Channel Count
TLV351x 6ns 180MHz 1.1mA 5mV 1/2
TLV323x 15ns 55MHz 200μA 4mV 1/2
LMV7219 7ns N/A 600ps 6mV 1

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