SNVAA88 December   2023 LM51581-Q1 , TPS1H000-Q1 , TPS92642-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2System Description
    1. 2.1 Dual Cable Concept
    2. 2.2 Single Cable Concept
  6. 3Camera Module Design with Single Coaxial Cable Connection
    1. 3.1 Power-Over-Coax Filter
    2. 3.2 Boost Converter
    3. 3.3 High-Side Switch
    4. 3.4 Buffer Capacitor
    5. 3.5 LED Driver
    6. 3.6 Serializer
    7. 3.7 Design Steps
  7. 4Test Results
    1. 4.1 LED and PoC Voltage Waveforms
    2. 4.2 Margin Analysis Program Result
    3. 4.3 Differential Supply Noise Level
    4. 4.4 Test Cases
  8. 5Summary
  9. 6References

4.1 LED and PoC Voltage Waveforms

Figure 4-8 shows the voltage waveform of the LED driver output in yellow and the corresponding voltage on the coaxial cable in green. The figure shows that the LEDs are pulsed correctly and the voltage waveform on the coaxial cable is as expected. The figure shows the waveforms for a LED current of 2.5 A , a pulse width of 4 ms and a high-side switch current limit of 250 mA.

GUID-20230928-SS0I-8KQG-MBW3-SF0WLGS61GC0-low.png Figure 4-1 LED and PoC Voltage Waveform