SLUSE80A September 2021 – November 2021 UCC14240-Q1
The RLIM resistor chosen can provide enough current for the load using the following equations, whichever has lower RLIM value. Equation 1 shows source current due to capacitor variation and IQ. Equation 2 shows sink current due to capacitor variation and IQ.
RLIM value determines response time of (COM – VEE) regulation. Too low an RLIM value can cause oscillation and can overload (VDD – VEE). Too high an RLIM value can give offset errors, due to slow response. If RLIM is greater than above calculations, then there is not enough current available to replenish the charge to the output capacitors, causing a charge imbalance where the voltage is not able to maintain regulation, and eventually exceeds the OVP2 or UVP2 FAULT thresholds and shutting down the device for protection.