Texas Instruments provides a recommended PCB layout in the datasheet, but it's essential to follow good PCB design practices, such as keeping the input and output traces separate, using a solid ground plane, and minimizing parasitic inductance. Additionally, it's recommended to use a 4-layer PCB with a dedicated power plane and a dedicated ground plane.
To ensure stability, it's crucial to follow the recommended component values and PCB layout. Additionally, make sure to decouple the input and output with capacitors, and use a low-ESR output capacitor. It's also recommended to add a small resistor (e.g., 10 ohms) in series with the output capacitor to prevent oscillations.
Although the datasheet specifies a maximum input voltage of 18V, it's recommended to limit the input voltage to 15V to ensure reliable operation and prevent damage to the device.
The output voltage ripple and noise can be calculated using the equations provided in the datasheet. However, it's essential to consider the output capacitor's ESR, the switching frequency, and the input voltage ripple when calculating the output voltage ripple and noise.
The recommended input capacitor value is 10uF to 22uF, and it's recommended to use a low-ESR ceramic capacitor (e.g., X5R or X7R) to minimize input voltage ripple and ensure stable operation.
MC33078DRE4 datasheet
by Texas Instruments
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