JAJSQ34A april 2023 – august 2023 UCC14131-Q1
PRODUCTION DATA
The UCC14131-Q1 devices sense the output voltage through FBVDD and FBVEE pins to control the output voltage. To prevent the output voltage becomes too high, damages the load or UCC14131-Q1 device itself, the UCC14131-Q1 devices are equipped with the output overvoltage protection. There are two levels of overvoltage protection, based on the feedback pin voltage, and the output voltage.
During the normal operation, because of load transient, or load unbalancing between two outputs, the output voltages can exceed its regulation level. Based on the pin voltages on FBVDD and FBVEE, after the voltage exceeds the threshold, VVDD_OVP_RISE, or VVEE_OVP_RISE (10% above the target regulation voltage), the converter stops switching immediately.
In rare cases, the voltage divider becomes malfunction and gives the wrong output voltage information. In turn, the control loop can regulate the output voltages at a wrong voltage level. The UCC14131-Q1 device is also equipped with a fail-safe overvoltage protection. After the VDD-VEE voltage becomes higher than the overvoltage protection threshold VVDD_OVLOS_RISE, the converter shuts down immediately. This fail-safe protection level is set at 31 V. It is meant to protect UCC14131-Q1 devices, instead of the load. The design must ensure the voltage feedback divider normal operation at all conditions.
The output overvoltage protections have the latch-off response.