The recommended PCB layout for optimal thermal performance involves placing the device on a 2-layer or 4-layer board with a solid ground plane on the bottom layer, and using thermal vias to connect the exposed pad to the ground plane. Additionally, keeping the copper traces wide and short can help to reduce thermal resistance.
To ensure the device is stable and does not oscillate, it is recommended to follow the recommended component values and layout guidelines in the datasheet, and to add a 10nF to 100nF ceramic capacitor between the VIN pin and the GND pin to filter out high-frequency noise.
Although the datasheet specifies a maximum input voltage of 18V, it is recommended to limit the input voltage to 15V to ensure reliable operation and to prevent damage to the device.
The output voltage ripple can be calculated using the formula: ΔVout = (Iout * ESL) / (Cout * fsw), where Iout is the output current, ESL is the equivalent series inductance of the output capacitor, Cout is the output capacitance, and fsw is the switching frequency.
The recommended output capacitor type is a low-ESR ceramic capacitor, such as an X5R or X7R dielectric, with a value of 10uF to 22uF. The output capacitor value should be chosen based on the output voltage ripple requirement and the output current.
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