A good PCB layout for the UCC38C45D involves keeping the input and output stages separate, using a star-ground configuration, and placing the input filter components close to the IC. Additionally, using a solid ground plane and minimizing trace lengths can help reduce EMI.
The choice of input filter components depends on the specific application and the desired level of noise attenuation. A good starting point is to use a combination of ceramic capacitors and resistors to create a pi-filter or a T-filter. The values of these components can be calculated using the impedance ratio and the desired cutoff frequency.
The UCC38C45D can deliver up to 1A of output current, but this is dependent on the input voltage, output voltage, and the thermal design of the system. It's recommended to check the thermal design and the output current requirements to ensure the IC can deliver the required current.
To ensure stability, it's essential to follow the recommended layout and component selection guidelines. Additionally, the output voltage should be decoupled with a capacitor, and the input voltage should be filtered to reduce noise. It's also recommended to add a small capacitor (e.g., 10nF) between the output and ground to improve stability.
The recommended input voltage range for the UCC38C45D is 12V to 40V, but it can operate up to 42V with some derating. It's essential to check the datasheet for the specific input voltage range and derating curves to ensure the IC operates within its recommended specifications.
UCC38C45D datasheet
by Texas Instruments
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