Dear James,
Kindly clarify the reason for Malfunction in the EN & OUT (as well as source positive) during the turn OFF the pulse to EN pin (After the solenoid operates, Plunger Moves).
Please find the Details below.
Solenoid Series Resistance = 5.6 ohm; Nominal Operating Voltage = 120VDC; Total circuit powered ON time = 100ms & above;
The solenoid (Plunger Moving) operating time = 40ms max
Peak current limit is = 12A, Rsoc = 200k; Rpeak = 166k; Rhold= 85k; Ren=20k; Ckeep = 1uF (Vales are Based on excel sheet Shared by Kevin in TI E2E Forum)
When I have been Powered ON & OFF the entire circuit, DRV110 is working fine without any interrupt/Noise in the signals or Power Lines
But in the case, When I have been powered on the circuit for 100ms & the pulse to the EN pin would be break in after 40 ms (After Plunger Movement). When this happens we have notice that the hysteresis in the EN, OUT, Ckeep & Source. Kindly refer the attached waveforms, Schematic.
Awaiting for your feedback on the same.(Please visit the site to view this file)
Waveform 1:
Yellow - OUT; Blue - Ckeep; Green - EN; Pink - Solenoid current
Waveform 3:
Blue - Across the source voltage; Yellow - Across the 25mohm (Series in the source); Green - Plunger Position Detection o/p
Waveform4:
Yellow - OUT; Pink - Solenoid Current ; Green - Plunger Position Detection o/p
Waveform5:
Green - EN ; Yellow -OUT; Pink - Solenoid Current
Waveform6:
Green - EN ; Yellow -OUT; Pink - Solenoid Current
Regards,
Elango