ZHCSMR1C october 2019 – september 2021 UCC5870-Q1
PRODUCTION DATA
VREG1 is internally generated from VCC1. VREG1 regulates to 1.8V, and supplies internal circuits on the primary side. VREG1 requires a 4.7µF bypass capacitance from VREG1 to GND1 for proper operation. The current out of VREG1 is limited and this current limit is monitored. If the current limit is active for the deglitch time, a internal regulation overcurrent fault is recorded in STATUS2[VREG1_ILIMIT_FAULT]. If unmasked, nFLT1 goes low. Additionally, VREG1 is monitored for both undervoltage and overvoltage conditions. Any VREG1 UV fault is recorded in STATUS2[INT_REG_PRI_FAULT] (STATUS2). Any OV condition on VREG1 causes the VREG1 output to latch off and shuts down the device. This action results in a secondary communication failure, which shuts down the driver output according to CFG10[FS_STATE_INT_COMM_SEC] bit (CFG10). The VCC1 and VCC2 power must be recycled in order to restart the device.