ZHCSKA3D September 2019 – November 2023 UCC21750-Q1
PRODUCTION DATA
During the turn on and turn off switching transient, the peak source and sink current is provided by the VDD and VEE power supply. The large peak current is possible to drain the VDD and VEE voltage level and cause a voltage droop on the power supplies. To stabilize the power supply and ensure a reliable operation, TI recommends a set of decoupling capacitors at the power supplies. Considering the UCC21750-Q1 has ±10-A peak drive strength and can generate high dV/dt, TI recommends a 10-μF bypass cap between VDD and COM, VEE and COM. TI recommends a 1-μF bypass cap between VCC and GND due to less current comparing with output side power supplies. A 0.1-μF decoupling cap is also recommended for each power supply to filter out high frequency noise. The decoupling capacitors must be low ESR and ESL to avoid high frequency noise, and must be placed as close as possible to the VCC, VDD and VEE pins to prevent noise coupling from the system parasitics of PCB layout.