SLUSFS4A September 2025 – September 2025 UCC27734-Q1 , UCC27735-Q1
PRODUCTION DATA
A RC filter should be added between the PWM controller and input pins of the UCC2773x-Q1 to filter the high frequency noise, like RHI/CHI and RLI/CLI which are shown in Figure 7-1. For the typical recommended values of the RC filter, refer to below:
The RC filter should be sized based on desired propagation delay and noise frequency and amplitude. Higher values of resistance and capacitance will filter more noise, but increase the rise and fall of the input signal which reduces the effective propagation delay. An RC filter may also be added to the EN pin if more noise immunity is needed.