Power supply current limitation
When generating nominal 1.2 us pulses on all six blocking outputs and with all outputs terminated with 50 ohm resistors, the blocking power supply TPS40210 boost power controller enters current limitation mode and restarts. This results in the following:
- the blocking power supply is 11.6V instead of 27V (12V from the VME minus some voltage drop)
- pulse signals are still generated, but at 10V amplitude instead of 24V
When the boost power controller restarts, the PWM control of the boost gate drive transistor stops and the voltage at the regulator's output is the voltage at the regulator's input.
Reset occurs in approx. 189 ms (calculated using eq. 16 thru 18 from the TPS40210 datasheet), after which the output voltage returns to the nominal 27V. However, if more high-frequency pulses are input afterwards, the TPS40210 goes back into reset mode.
To account for this limitation, a pulse limit will be implemented in gateware as part of issue #923.