We are having a problem at -40C with a 3 phase PFC. The output of the voltage error amplifier of the UC2854 IC goes low with the output voltage below regulation and VCC and ENA pins tied to 12V. This happens after an input voltage dropout of 150ms during the boost capacitor recharge. The boost output voltage is 380V. The output power delivered by the boost is 250W. Attached is a picture of the input current on phase A with the corresponding PFC contol IC's VCC,ENA , and VEA signals. The VCC and ENA trace was measured in the temperature chamber with a short 1/2" ground connection. There does not appear to be any noise spikes on the signal.
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